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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  *  linux/drivers/block/floppy.c
  *
  *  Copyright (C) 1991, 1992  Linus Torvalds
  *  Copyright (C) 1993, 1994  Alain Knaff
  *  Copyright (C) 1998 Alan Cox
  */
 
 /*
  * 02.12.91 - Changed to static variables to indicate need for reset
  * and recalibrate. This makes some things easier (output_byte reset
  * checking etc), and means less interrupt jumping in case of errors,
  * so the code is hopefully easier to understand.
  */
 
 /*
  * This file is certainly a mess. I've tried my best to get it working,
  * but I don't like programming floppies, and I have only one anyway.
  * Urgel. I should check for more errors, and do more graceful error
  * recovery. Seems there are problems with several drives. I've tried to
  * correct them. No promises.
  */
 
 /*
  * As with hd.c, all routines within this file can (and will) be called
  * by interrupts, so extreme caution is needed. A hardware interrupt
  * handler may not sleep, or a kernel panic will happen. Thus I cannot
  * call "floppy-on" directly, but have to set a special timer interrupt
  * etc.
  */
 
 /*
  * 28.02.92 - made track-buffering routines, based on the routines written
  * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
  */
 
 /*
  * Automatic floppy-detection and formatting written by Werner Almesberger
  * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
  * the floppy-change signal detection.
  */
 
 /*
  * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
  * FDC data overrun bug, added some preliminary stuff for vertical
  * recording support.
  *
  * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
  *
  * TODO: Errors are still not counted properly.
  */
 
 /* 1992/9/20
  * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
  * modeled after the freeware MS-DOS program fdformat/88 V1.8 by
  * Christoph H. Hochst\"atter.
  * I have fixed the shift values to the ones I always use. Maybe a new
  * ioctl() should be created to be able to modify them.
  * There is a bug in the driver that makes it impossible to format a
  * floppy as the first thing after bootup.
  */
 
 /*
  * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
  * this helped the floppy driver as well. Much cleaner, and still seems to
  * work.
  */
 
 /* 1994/6/24 --bbroad-- added the floppy table entries and made
  * minor modifications to allow 2.88 floppies to be run.
  */
 
 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
  * disk types.
  */
 
 /*
  * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
  * format bug fixes, but unfortunately some new bugs too...
  */
 
 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write
  * errors to allow safe writing by specialized programs.
  */
 
 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
  * by defining bit 1 of the "stretch" parameter to mean put sectors on the
  * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
  * drives are "upside-down").
  */
 
 /*
  * 1995/8/26 -- Andreas Busse -- added Mips support.
  */
 
 /*
  * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent
  * features to asm/floppy.h.
  */
 
 /*
  * 1998/1/21 -- Richard Gooch <rgooch@atnf.csiro.au> -- devfs support
  */
 
 /*
  * 1998/05/07 -- Russell King -- More portability cleanups; moved definition of
  * interrupt and dma channel to asm/floppy.h. Cleaned up some formatting &
  * use of '0' for NULL.
  */
 
 /*
  * 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation
  * failures.
  */
 
 /*
  * 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives.
  */
 
 /*
  * 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24
  * days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were
  * being used to store jiffies, which are unsigned longs).
  */
 
 /*
  * 2000/08/28 -- Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  * - get rid of check_region
  * - s/suser/capable/
  */
 
 /*
  * 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no
  * floppy controller (lingering task on list after module is gone... boom.)
  */
 
 /*
  * 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range
  * (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix
  * requires many non-obvious changes in arch dependent code.
  */
 
 /* 2003/07/28 -- Daniele Bellucci <bellucda@tiscali.it>.
  * Better audit of register_blkdev.
  */
 
 #define REALLY_SLOW_IO
 
 #define DEBUGT 2
 
 #define DPRINT(format, args...) \
     pr_info("floppy%d: " format, current_drive, ##args)
 
 #define DCL_DEBUG       /* debug disk change line */
 #ifdef DCL_DEBUG
 #define debug_dcl(test, fmt, args...) \
     do { if ((test) & FD_DEBUG) DPRINT(fmt, ##args); } while (0)
 #else
 #define debug_dcl(test, fmt, args...) \
     do { if (0) DPRINT(fmt, ##args); } while (0)
 #endif
 
 /* do print messages for unexpected interrupts */
 static int print_unex = 1;
 #include <linux/module.h>
 #include <linux/sched.h>
 #include <linux/fs.h>
 #include <linux/kernel.h>
 #include <linux/timer.h>
 #include <linux/workqueue.h>
 #include <linux/fdreg.h>
 #include <linux/fd.h>
 #include <linux/hdreg.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/bio.h>
 #include <linux/string.h>
 #include <linux/jiffies.h>
 #include <linux/fcntl.h>
 #include <linux/delay.h>
 #include <linux/mc146818rtc.h>  /* CMOS defines */
 #include <linux/ioport.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
 #include <linux/major.h>
 #include <linux/platform_device.h>
 #include <linux/mod_devicetable.h>
 #include <linux/mutex.h>
 #include <linux/io.h>
 #include <linux/uaccess.h>
 #include <linux/async.h>
 #include <linux/compat.h>
 
 /*
  * PS/2 floppies have much slower step rates than regular floppies.
  * It's been recommended that take about 1/4 of the default speed
  * in some more extreme cases.
  */
 static DEFINE_MUTEX(floppy_mutex);
 static int slow_floppy;
 
 #include <asm/dma.h>
 #include <asm/irq.h>
 
 static int FLOPPY_IRQ = 6;
 static int FLOPPY_DMA = 2;
 static int can_use_virtual_dma = 2;
 /* =======
  * can use virtual DMA:
  * 0 = use of virtual DMA disallowed by config
  * 1 = use of virtual DMA prescribed by config
  * 2 = no virtual DMA preference configured.  By default try hard DMA,
  * but fall back on virtual DMA when not enough memory available
  */
 
 static int use_virtual_dma;
 /* =======
  * use virtual DMA
  * 0 using hard DMA
  * 1 using virtual DMA
  * This variable is set to virtual when a DMA mem problem arises, and
  * reset back in floppy_grab_irq_and_dma.
  * It is not safe to reset it in other circumstances, because the floppy
  * driver may have several buffers in use at once, and we do currently not
  * record each buffers capabilities
  */
 
 static DEFINE_SPINLOCK(floppy_lock);
 
 static unsigned short virtual_dma_port = 0x3f0;
 irqreturn_t floppy_interrupt(int irq, void *dev_id);
 static int set_dor(int fdc, char mask, char data);
 
 #define K_64    0x10000     /* 64KB */
 
 /* the following is the mask of allowed drives. By default units 2 and
  * 3 of both floppy controllers are disabled, because switching on the
  * motor of these drives causes system hangs on some PCI computers. drive
  * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
  * a drive is allowed.
  *
  * NOTE: This must come before we include the arch floppy header because
  *       some ports reference this variable from there. -DaveM
  */
 
 static int allowed_drive_mask = 0x33;
 
 #include <asm/floppy.h>
 
 static int irqdma_allocated;
 
 #include <linux/blk-mq.h>
 #include <linux/blkpg.h>
 #include <linux/cdrom.h>    /* for the compatibility eject ioctl */
 #include <linux/completion.h>
 
 static LIST_HEAD(floppy_reqs);
 static struct request *current_req;
 static int set_next_request(void);
 
 #ifndef fd_get_dma_residue
 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
 #endif
 
 /* Dma Memory related stuff */
 
 #ifndef fd_dma_mem_free
 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
 #endif
 
 #ifndef fd_dma_mem_alloc
 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size))
 #endif
 
 #ifndef fd_cacheflush
 #define fd_cacheflush(addr, size) /* nothing... */
 #endif
 
 static inline void fallback_on_nodma_alloc(char **addr, size_t l)
 {
 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
     if (*addr)
         return;     /* we have the memory */
     if (can_use_virtual_dma != 2)
         return;     /* no fallback allowed */
     pr_info("DMA memory shortage. Temporarily falling back on virtual DMA\n");
     *addr = (char *)nodma_mem_alloc(l);
 #else
     return;
 #endif
 }
 
 /* End dma memory related stuff */
 
 static unsigned long fake_change;
 static bool initialized;
 
 #define ITYPE(x)    (((x) >> 2) & 0x1f)
 #define TOMINOR(x)  ((x & 3) | ((x & 4) << 5))
 #define UNIT(x)     ((x) & 0x03)        /* drive on fdc */
 #define FDC(x)      (((x) & 0x04) >> 2) /* fdc of drive */
     /* reverse mapping from unit and fdc to drive */
 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
 
 #define PH_HEAD(floppy, head) (((((floppy)->stretch & 2) >> 1) ^ head) << 2)
 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
 
 /* read/write commands */
 #define COMMAND         0
 #define DR_SELECT       1
 #define TRACK           2
 #define HEAD            3
 #define SECTOR          4
 #define SIZECODE        5
 #define SECT_PER_TRACK      6
 #define GAP         7
 #define SIZECODE2       8
 #define NR_RW 9
 
 /* format commands */
 #define F_SIZECODE      2
 #define F_SECT_PER_TRACK    3
 #define F_GAP           4
 #define F_FILL          5
 #define NR_F 6
 
 /*
  * Maximum disk size (in kilobytes).
  * This default is used whenever the current disk size is unknown.
  * [Now it is rather a minimum]
  */
 #define MAX_DISK_SIZE 4     /* 3984 */
 
 /*
  * globals used by 'result()'
  */
 static unsigned char reply_buffer[FD_RAW_REPLY_SIZE];
 static int inr;     /* size of reply buffer, when called from interrupt */
 #define ST0     0
 #define ST1     1
 #define ST2     2
 #define ST3     0   /* result of GETSTATUS */
 #define R_TRACK     3
 #define R_HEAD      4
 #define R_SECTOR    5
 #define R_SIZECODE  6
 
 #define SEL_DLY     (2 * HZ / 100)
 
 /*
  * this struct defines the different floppy drive types.
  */
 static struct {
     struct floppy_drive_params params;
     const char *name;   /* name printed while booting */
 } default_drive_params[] = {
 /* NOTE: the time values in jiffies should be in msec!
  CMOS drive type
   |     Maximum data rate supported by drive type
   |     |   Head load time, msec
   |     |   |   Head unload time, msec (not used)
   |     |   |   |     Step rate interval, usec
   |     |   |   |     |       Time needed for spinup time (jiffies)
   |     |   |   |     |       |      Timeout for spinning down (jiffies)
   |     |   |   |     |       |      |   Spindown offset (where disk stops)
   |     |   |   |     |       |      |   |     Select delay
   |     |   |   |     |       |      |   |     |     RPS
   |     |   |   |     |       |      |   |     |     |    Max number of tracks
   |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
   |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
   |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
 {{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
       0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
 
 {{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 
 {{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
       0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 
 {{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
       0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
 
 {{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
       0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
 
 {{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 
 {{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
 /*    |  --autodetected formats---    |      |      |
  *    read_track                      |      |    Name printed when booting
  *                    |     Native format
  *              Frequency of disk change checks */
 };
 
 static struct floppy_drive_params drive_params[N_DRIVE];
 static struct floppy_drive_struct drive_state[N_DRIVE];
 static struct floppy_write_errors write_errors[N_DRIVE];
 static struct timer_list motor_off_timer[N_DRIVE];
 static struct blk_mq_tag_set tag_sets[N_DRIVE];
 static struct block_device *opened_bdev[N_DRIVE];
 static DEFINE_MUTEX(open_lock);
 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
 
 /*
  * This struct defines the different floppy types.
  *
  * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
  * types (e.g. 360kB diskette in 1.2MB drive, etc.).  Bit 1 of 'stretch'
  * tells if the disk is in Commodore 1581 format, which means side 0 sectors
  * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
  * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
  * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
  * side 0 is on physical side 0 (but with the misnamed sector IDs).
  * 'stretch' should probably be renamed to something more general, like
  * 'options'.
  *
  * Bits 2 through 9 of 'stretch' tell the number of the first sector.
  * The LSB (bit 2) is flipped. For most disks, the first sector
  * is 1 (represented by 0x00<<2).  For some CP/M and music sampler
  * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2).
  * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2).
  *
  * Other parameters should be self-explanatory (see also setfdprm(8)).
  */
 /*
         Size
          |  Sectors per track
          |  | Head
          |  | |  Tracks
          |  | |  | Stretch
          |  | |  | |  Gap 1 size
          |  | |  | |    |  Data rate, | 0x40 for perp
          |  | |  | |    |    |  Spec1 (stepping rate, head unload
          |  | |  | |    |    |    |    /fmt gap (gap2) */
 static struct floppy_struct floppy_type[32] = {
     {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
     {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
     { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
     {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
     { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
     {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
     { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
     { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
     { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
     { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /*  9 3.12MB 3.5"   */
 
     { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
     { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
     {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
     { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
     { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
     { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
     {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
     { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
     { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
     { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 
     { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
     { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
     { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
     { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
     { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
     { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
     { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
     { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
     { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
     { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
 
     { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
     { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
 };
 
 static struct gendisk *disks[N_DRIVE][ARRAY_SIZE(floppy_type)];
 
 #define SECTSIZE (_FD_SECTSIZE(*floppy))
 
 /* Auto-detection: Disk type used until the next media change occurs. */
 static struct floppy_struct *current_type[N_DRIVE];
 
 /*
  * User-provided type information. current_type points to
  * the respective entry of this array.
  */
 static struct floppy_struct user_params[N_DRIVE];
 
 static sector_t floppy_sizes[256];
 
 static char floppy_device_name[] = "floppy";
 
 /*
  * The driver is trying to determine the correct media format
  * while probing is set. rw_interrupt() clears it after a
  * successful access.
  */
 static int probing;
 
 /* Synchronization of FDC access. */
 #define FD_COMMAND_NONE     -1
 #define FD_COMMAND_ERROR    2
 #define FD_COMMAND_OKAY     3
 
 static volatile int command_status = FD_COMMAND_NONE;
 static unsigned long fdc_busy;
 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
 static DECLARE_WAIT_QUEUE_HEAD(command_done);
 
 /* errors encountered on the current (or last) request */
 static int floppy_errors;
 
 /* Format request descriptor. */
 static struct format_descr format_req;
 
 /*
  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
  * H is head unload time (1=16ms, 2=32ms, etc)
  */
 
 /*
  * Track buffer
  * Because these are written to by the DMA controller, they must
  * not contain a 64k byte boundary crossing, or data will be
  * corrupted/lost.
  */
 static char *floppy_track_buffer;
 static int max_buffer_sectors;
 
 typedef void (*done_f)(int);
 static const struct cont_t {
     void (*interrupt)(void);
                 /* this is called after the interrupt of the
                  * main command */
     void (*redo)(void); /* this is called to retry the operation */
     void (*error)(void);    /* this is called to tally an error */
     done_f done;        /* this is called to say if the operation has
                  * succeeded/failed */
 } *cont;
 
 static void floppy_ready(void);
 static void floppy_start(void);
 static void process_fd_request(void);
 static void recalibrate_floppy(void);
 static void floppy_shutdown(struct work_struct *);
 
 static int floppy_request_regions(int);
 static void floppy_release_regions(int);
 static int floppy_grab_irq_and_dma(void);
 static void floppy_release_irq_and_dma(void);
 
 /*
  * The "reset" variable should be tested whenever an interrupt is scheduled,
  * after the commands have been sent. This is to ensure that the driver doesn't
  * get wedged when the interrupt doesn't come because of a failed command.
  * reset doesn't need to be tested before sending commands, because
  * output_byte is automatically disabled when reset is set.
  */
 static void reset_fdc(void);
 static int floppy_revalidate(struct gendisk *disk);
 
 /*
  * These are global variables, as that's the easiest way to give
  * information to interrupts. They are the data used for the current
  * request.
  */
 #define NO_TRACK    -1
 #define NEED_1_RECAL    -2
 #define NEED_2_RECAL    -3
 
 static atomic_t usage_count = ATOMIC_INIT(0);
 
 /* buffer related variables */
 static int buffer_track = -1;
 static int buffer_drive = -1;
 static int buffer_min = -1;
 static int buffer_max = -1;
 
 /* fdc related variables, should end up in a struct */
 static struct floppy_fdc_state fdc_state[N_FDC];
 static int current_fdc;         /* current fdc */
 
 static struct workqueue_struct *floppy_wq;
 
 static struct floppy_struct *_floppy = floppy_type;
 static unsigned char current_drive;
 static long current_count_sectors;
 static unsigned char fsector_t; /* sector in track */
 static unsigned char in_sector_offset;  /* offset within physical sector,
                      * expressed in units of 512 bytes */
 
 static inline unsigned char fdc_inb(int fdc, int reg)
 {
     return fd_inb(fdc_state[fdc].address, reg);
 }
 
 static inline void fdc_outb(unsigned char value, int fdc, int reg)
 {
     fd_outb(value, fdc_state[fdc].address, reg);
 }
 
 static inline bool drive_no_geom(int drive)
 {
     return !current_type[drive] && !ITYPE(drive_state[drive].fd_device);
 }
 
 #ifndef fd_eject
 static inline int fd_eject(int drive)
 {
     return -EINVAL;
 }
 #endif
 
 /*
  * Debugging
  * =========
  */
 #ifdef DEBUGT
 static long unsigned debugtimer;
 
 static inline void set_debugt(void)
 {
     debugtimer = jiffies;
 }
 
 static inline void debugt(const char *func, const char *msg)
 {
     if (drive_params[current_drive].flags & DEBUGT)
         pr_info("%s:%s dtime=%lu\n", func, msg, jiffies - debugtimer);
 }
 #else
 static inline void set_debugt(void) { }
 static inline void debugt(const char *func, const char *msg) { }
 #endif /* DEBUGT */
 
 
 static DECLARE_DELAYED_WORK(fd_timeout, floppy_shutdown);
 static const char *timeout_message;
 
 static void is_alive(const char *func, const char *message)
 {
     /* this routine checks whether the floppy driver is "alive" */
     if (test_bit(0, &fdc_busy) && command_status < 2 &&
         !delayed_work_pending(&fd_timeout)) {
         DPRINT("%s: timeout handler died.  %s\n", func, message);
     }
 }
 
 static void (*do_floppy)(void) = NULL;
 
 #define OLOGSIZE 20
 
 static void (*lasthandler)(void);
 static unsigned long interruptjiffies;
 static unsigned long resultjiffies;
 static int resultsize;
 static unsigned long lastredo;
 
 static struct output_log {
     unsigned char data;
     unsigned char status;
     unsigned long jiffies;
 } output_log[OLOGSIZE];
 
 static int output_log_pos;
 
 #define MAXTIMEOUT -2
 
 static void __reschedule_timeout(int drive, const char *message)
 {
     unsigned long delay;
 
     if (drive < 0 || drive >= N_DRIVE) {
         delay = 20UL * HZ;
         drive = 0;
     } else
         delay = drive_params[drive].timeout;
 
     mod_delayed_work(floppy_wq, &fd_timeout, delay);
     if (drive_params[drive].flags & FD_DEBUG)
         DPRINT("reschedule timeout %s\n", message);
     timeout_message = message;
 }
 
 static void reschedule_timeout(int drive, const char *message)
 {
     unsigned long flags;
 
     spin_lock_irqsave(&floppy_lock, flags);
     __reschedule_timeout(drive, message);
     spin_unlock_irqrestore(&floppy_lock, flags);
 }
 
 #define INFBOUND(a, b) (a) = max_t(int, a, b)
 #define SUPBOUND(a, b) (a) = min_t(int, a, b)
 
 /*
  * Bottom half floppy driver.
  * ==========================
  *
  * This part of the file contains the code talking directly to the hardware,
  * and also the main service loop (seek-configure-spinup-command)
  */
 
 /*
  * disk change.
  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
  * and the last_checked date.
  *
  * last_checked is the date of the last check which showed 'no disk change'
  * FD_DISK_CHANGE is set under two conditions:
  * 1. The floppy has been changed after some i/o to that floppy already
  *    took place.
  * 2. No floppy disk is in the drive. This is done in order to ensure that
  *    requests are quickly flushed in case there is no disk in the drive. It
  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
  *    the drive.
  *
  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
  *  each seek. If a disk is present, the disk change line should also be
  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
  *  change line is set, this means either that no disk is in the drive, or
  *  that it has been removed since the last seek.
  *
  * This means that we really have a third possibility too:
  *  The floppy has been changed after the last seek.
  */
 
 static int disk_change(int drive)
 {
     int fdc = FDC(drive);
 
     if (time_before(jiffies, drive_state[drive].select_date + drive_params[drive].select_delay))
         DPRINT("WARNING disk change called early\n");
     if (!(fdc_state[fdc].dor & (0x10 << UNIT(drive))) ||
         (fdc_state[fdc].dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
         DPRINT("probing disk change on unselected drive\n");
         DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
                (unsigned int)fdc_state[fdc].dor);
     }
 
     debug_dcl(drive_params[drive].flags,
           "checking disk change line for drive %d\n", drive);
     debug_dcl(drive_params[drive].flags, "jiffies=%lu\n", jiffies);
     debug_dcl(drive_params[drive].flags, "disk change line=%x\n",
           fdc_inb(fdc, FD_DIR) & 0x80);
     debug_dcl(drive_params[drive].flags, "flags=%lx\n",
           drive_state[drive].flags);
 
     if (drive_params[drive].flags & FD_BROKEN_DCL)
         return test_bit(FD_DISK_CHANGED_BIT,
                 &drive_state[drive].flags);
     if ((fdc_inb(fdc, FD_DIR) ^ drive_params[drive].flags) & 0x80) {
         set_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
                     /* verify write protection */
 
         if (drive_state[drive].maxblock)    /* mark it changed */
             set_bit(FD_DISK_CHANGED_BIT,
                 &drive_state[drive].flags);
 
         /* invalidate its geometry */
         if (drive_state[drive].keep_data >= 0) {
             if ((drive_params[drive].flags & FTD_MSG) &&
                 current_type[drive] != NULL)
                 DPRINT("Disk type is undefined after disk change\n");
             current_type[drive] = NULL;
             floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
         }
 
         return 1;
     } else {
         drive_state[drive].last_checked = jiffies;
         clear_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[drive].flags);
     }
     return 0;
 }
 
 static inline int is_selected(int dor, int unit)
 {
     return ((dor & (0x10 << unit)) && (dor & 3) == unit);
 }
 
 static bool is_ready_state(int status)
 {
     int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA);
     return state == STATUS_READY;
 }
 
 static int set_dor(int fdc, char mask, char data)
 {
     unsigned char unit;
     unsigned char drive;
     unsigned char newdor;
     unsigned char olddor;
 
     if (fdc_state[fdc].address == -1)
         return -1;
 
     olddor = fdc_state[fdc].dor;
     newdor = (olddor & mask) | data;
     if (newdor != olddor) {
         unit = olddor & 0x3;
         if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
             drive = REVDRIVE(fdc, unit);
             debug_dcl(drive_params[drive].flags,
                   "calling disk change from set_dor\n");
             disk_change(drive);
         }
         fdc_state[fdc].dor = newdor;
         fdc_outb(newdor, fdc, FD_DOR);
 
         unit = newdor & 0x3;
         if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
             drive = REVDRIVE(fdc, unit);
             drive_state[drive].select_date = jiffies;
         }
     }
     return olddor;
 }
 
 static void twaddle(int fdc, int drive)
 {
     if (drive_params[drive].select_delay)
         return;
     fdc_outb(fdc_state[fdc].dor & ~(0x10 << UNIT(drive)),
          fdc, FD_DOR);
     fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR);
     drive_state[drive].select_date = jiffies;
 }
 
 /*
  * Reset all driver information about the specified fdc.
  * This is needed after a reset, and after a raw command.
  */
 static void reset_fdc_info(int fdc, int mode)
 {
     int drive;
 
     fdc_state[fdc].spec1 = fdc_state[fdc].spec2 = -1;
     fdc_state[fdc].need_configure = 1;
     fdc_state[fdc].perp_mode = 1;
     fdc_state[fdc].rawcmd = 0;
     for (drive = 0; drive < N_DRIVE; drive++)
         if (FDC(drive) == fdc &&
             (mode || drive_state[drive].track != NEED_1_RECAL))
             drive_state[drive].track = NEED_2_RECAL;
 }
 
 /*
  * selects the fdc and drive, and enables the fdc's input/dma.
  * Both current_drive and current_fdc are changed to match the new drive.
  */
 static void set_fdc(int drive)
 {
     unsigned int fdc;
 
     if (drive < 0 || drive >= N_DRIVE) {
         pr_info("bad drive value %d\n", drive);
         return;
     }
 
     fdc = FDC(drive);
     if (fdc >= N_FDC) {
         pr_info("bad fdc value\n");
         return;
     }
 
     set_dor(fdc, ~0, 8);
 #if N_FDC > 1
     set_dor(1 - fdc, ~8, 0);
 #endif
     if (fdc_state[fdc].rawcmd == 2)
         reset_fdc_info(fdc, 1);
     if (fdc_inb(fdc, FD_STATUS) != STATUS_READY)
         fdc_state[fdc].reset = 1;
 
     current_drive = drive;
     current_fdc = fdc;
 }
 
 /*
  * locks the driver.
  * Both current_drive and current_fdc are changed to match the new drive.
  */
 static int lock_fdc(int drive)
 {
     if (WARN(atomic_read(&usage_count) == 0,
          "Trying to lock fdc while usage count=0\n"))
         return -1;
 
     if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy)))
         return -EINTR;
 
     command_status = FD_COMMAND_NONE;
 
     reschedule_timeout(drive, "lock fdc");
     set_fdc(drive);
     return 0;
 }
 
 /* unlocks the driver */
 static void unlock_fdc(void)
 {
     if (!test_bit(0, &fdc_busy))
         DPRINT("FDC access conflict!\n");
 
     raw_cmd = NULL;
     command_status = FD_COMMAND_NONE;
     cancel_delayed_work(&fd_timeout);
     do_floppy = NULL;
     cont = NULL;
     clear_bit(0, &fdc_busy);
     wake_up(&fdc_wait);
 }
 
 /* switches the motor off after a given timeout */
 static void motor_off_callback(struct timer_list *t)
 {
     unsigned long nr = t - motor_off_timer;
     unsigned char mask = ~(0x10 << UNIT(nr));
 
     if (WARN_ON_ONCE(nr >= N_DRIVE))
         return;
 
     set_dor(FDC(nr), mask, 0);
 }
 
 /* schedules motor off */
 static void floppy_off(unsigned int drive)
 {
     unsigned long volatile delta;
     int fdc = FDC(drive);
 
     if (!(fdc_state[fdc].dor & (0x10 << UNIT(drive))))
         return;
 
     del_timer(motor_off_timer + drive);
 
     /* make spindle stop in a position which minimizes spinup time
      * next time */
     if (drive_params[drive].rps) {
         delta = jiffies - drive_state[drive].first_read_date + HZ -
             drive_params[drive].spindown_offset;
         delta = ((delta * drive_params[drive].rps) % HZ) / drive_params[drive].rps;
         motor_off_timer[drive].expires =
             jiffies + drive_params[drive].spindown - delta;
     }
     add_timer(motor_off_timer + drive);
 }
 
 /*
  * cycle through all N_DRIVE floppy drives, for disk change testing.
  * stopping at current drive. This is done before any long operation, to
  * be sure to have up to date disk change information.
  */
 static void scandrives(void)
 {
     int i;
     int drive;
     int saved_drive;
 
     if (drive_params[current_drive].select_delay)
         return;
 
     saved_drive = current_drive;
     for (i = 0; i < N_DRIVE; i++) {
         drive = (saved_drive + i + 1) % N_DRIVE;
         if (drive_state[drive].fd_ref == 0 || drive_params[drive].select_delay != 0)
             continue;   /* skip closed drives */
         set_fdc(drive);
         if (!(set_dor(current_fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
               (0x10 << UNIT(drive))))
             /* switch the motor off again, if it was off to
              * begin with */
             set_dor(current_fdc, ~(0x10 << UNIT(drive)), 0);
     }
     set_fdc(saved_drive);
 }
 
 static void empty(void)
 {
 }
 
 static void (*floppy_work_fn)(void);
 
 static void floppy_work_workfn(struct work_struct *work)
 {
     floppy_work_fn();
 }
 
 static DECLARE_WORK(floppy_work, floppy_work_workfn);
 
 static void schedule_bh(void (*handler)(void))
 {
     WARN_ON(work_pending(&floppy_work));
 
     floppy_work_fn = handler;
     queue_work(floppy_wq, &floppy_work);
 }
 
 static void (*fd_timer_fn)(void) = NULL;
 
 static void fd_timer_workfn(struct work_struct *work)
 {
     fd_timer_fn();
 }
 
 static DECLARE_DELAYED_WORK(fd_timer, fd_timer_workfn);
 
 static void cancel_activity(void)
 {
     do_floppy = NULL;
     cancel_delayed_work(&fd_timer);
     cancel_work_sync(&floppy_work);
 }
 
 /* this function makes sure that the disk stays in the drive during the
  * transfer */
 static void fd_watchdog(void)
 {
     debug_dcl(drive_params[current_drive].flags,
           "calling disk change from watchdog\n");
 
     if (disk_change(current_drive)) {
         DPRINT("disk removed during i/o\n");
         cancel_activity();
         cont->done(0);
         reset_fdc();
     } else {
         cancel_delayed_work(&fd_timer);
         fd_timer_fn = fd_watchdog;
         queue_delayed_work(floppy_wq, &fd_timer, HZ / 10);
     }
 }
 
 static void main_command_interrupt(void)
 {
     cancel_delayed_work(&fd_timer);
     cont->interrupt();
 }
 
 /* waits for a delay (spinup or select) to pass */
 static int fd_wait_for_completion(unsigned long expires,
                   void (*function)(void))
 {
     if (fdc_state[current_fdc].reset) {
         reset_fdc();    /* do the reset during sleep to win time
                  * if we don't need to sleep, it's a good
                  * occasion anyways */
         return 1;
     }
 
     if (time_before(jiffies, expires)) {
         cancel_delayed_work(&fd_timer);
         fd_timer_fn = function;
         queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies);
         return 1;
     }
     return 0;
 }
 
 static void setup_DMA(void)
 {
     unsigned long f;
 
     if (raw_cmd->length == 0) {
         print_hex_dump(KERN_INFO, "zero dma transfer size: ",
                    DUMP_PREFIX_NONE, 16, 1,
                    raw_cmd->fullcmd, raw_cmd->cmd_count, false);
         cont->done(0);
         fdc_state[current_fdc].reset = 1;
         return;
     }
     if (((unsigned long)raw_cmd->kernel_data) % 512) {
         pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
         cont->done(0);
         fdc_state[current_fdc].reset = 1;
         return;
     }
     f = claim_dma_lock();
     fd_disable_dma();
 #ifdef fd_dma_setup
     if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
              (raw_cmd->flags & FD_RAW_READ) ?
              DMA_MODE_READ : DMA_MODE_WRITE,
              fdc_state[current_fdc].address) < 0) {
         release_dma_lock(f);
         cont->done(0);
         fdc_state[current_fdc].reset = 1;
         return;
     }
     release_dma_lock(f);
 #else
     fd_clear_dma_ff();
     fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
     fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
             DMA_MODE_READ : DMA_MODE_WRITE);
     fd_set_dma_addr(raw_cmd->kernel_data);
     fd_set_dma_count(raw_cmd->length);
     virtual_dma_port = fdc_state[current_fdc].address;
     fd_enable_dma();
     release_dma_lock(f);
 #endif
 }
 
 static void show_floppy(int fdc);
 
 /* waits until the fdc becomes ready */
 static int wait_til_ready(int fdc)
 {
     int status;
     int counter;
 
     if (fdc_state[fdc].reset)
         return -1;
     for (counter = 0; counter < 10000; counter++) {
         status = fdc_inb(fdc, FD_STATUS);
         if (status & STATUS_READY)
             return status;
     }
     if (initialized) {
         DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
         show_floppy(fdc);
     }
     fdc_state[fdc].reset = 1;
     return -1;
 }
 
 /* sends a command byte to the fdc */
 static int output_byte(int fdc, char byte)
 {
     int status = wait_til_ready(fdc);
 
     if (status < 0)
         return -1;
 
     if (is_ready_state(status)) {
         fdc_outb(byte, fdc, FD_DATA);
         output_log[output_log_pos].data = byte;
         output_log[output_log_pos].status = status;
         output_log[output_log_pos].jiffies = jiffies;
         output_log_pos = (output_log_pos + 1) % OLOGSIZE;
         return 0;
     }
     fdc_state[fdc].reset = 1;
     if (initialized) {
         DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
                byte, fdc, status);
         show_floppy(fdc);
     }
     return -1;
 }
 
 /* gets the response from the fdc */
 static int result(int fdc)
 {
     int i;
     int status = 0;
 
     for (i = 0; i < FD_RAW_REPLY_SIZE; i++) {
         status = wait_til_ready(fdc);
         if (status < 0)
             break;
         status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
         if ((status & ~STATUS_BUSY) == STATUS_READY) {
             resultjiffies = jiffies;
             resultsize = i;
             return i;
         }
         if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
             reply_buffer[i] = fdc_inb(fdc, FD_DATA);
         else
             break;
     }
     if (initialized) {
         DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
                fdc, status, i);
         show_floppy(fdc);
     }
     fdc_state[fdc].reset = 1;
     return -1;
 }
 
 #define MORE_OUTPUT -2
 /* does the fdc need more output? */
 static int need_more_output(int fdc)
 {
     int status = wait_til_ready(fdc);
 
     if (status < 0)
         return -1;
 
     if (is_ready_state(status))
         return MORE_OUTPUT;
 
     return result(fdc);
 }
 
 /* Set perpendicular mode as required, based on data rate, if supported.
  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
  */
 static void perpendicular_mode(int fdc)
 {
     unsigned char perp_mode;
 
     if (raw_cmd->rate & 0x40) {
         switch (raw_cmd->rate & 3) {
         case 0:
             perp_mode = 2;
             break;
         case 3:
             perp_mode = 3;
             break;
         default:
             DPRINT("Invalid data rate for perpendicular mode!\n");
             cont->done(0);
             fdc_state[fdc].reset = 1;
                     /*
                      * convenient way to return to
                      * redo without too much hassle
                      * (deep stack et al.)
                      */
             return;
         }
     } else
         perp_mode = 0;
 
     if (fdc_state[fdc].perp_mode == perp_mode)
         return;
     if (fdc_state[fdc].version >= FDC_82077_ORIG) {
         output_byte(fdc, FD_PERPENDICULAR);
         output_byte(fdc, perp_mode);
         fdc_state[fdc].perp_mode = perp_mode;
     } else if (perp_mode) {
         DPRINT("perpendicular mode not supported by this FDC.\n");
     }
 }               /* perpendicular_mode */
 
 static int fifo_depth = 0xa;
 static int no_fifo;
 
 static int fdc_configure(int fdc)
 {
     /* Turn on FIFO */
     output_byte(fdc, FD_CONFIGURE);
     if (need_more_output(fdc) != MORE_OUTPUT)
         return 0;
     output_byte(fdc, 0);
     output_byte(fdc, 0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
     output_byte(fdc, 0);    /* pre-compensation from track 0 upwards */
     return 1;
 }
 
 #define NOMINAL_DTR 500
 
 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
  * head load time, and DMA disable flag to values needed by floppy.
  *
  * The value "dtr" is the data transfer rate in Kbps.  It is needed
  * to account for the data rate-based scaling done by the 82072 and 82077
  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
  * 8272a).
  *
  * Note that changing the data transfer rate has a (probably deleterious)
  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
  * fdc_specify is called again after each data transfer rate
  * change.
  *
  * srt: 1000 to 16000 in microseconds
  * hut: 16 to 240 milliseconds
  * hlt: 2 to 254 milliseconds
  *
  * These values are rounded up to the next highest available delay time.
  */
 static void fdc_specify(int fdc, int drive)
 {
     unsigned char spec1;
     unsigned char spec2;
     unsigned long srt;
     unsigned long hlt;
     unsigned long hut;
     unsigned long dtr = NOMINAL_DTR;
     unsigned long scale_dtr = NOMINAL_DTR;
     int hlt_max_code = 0x7f;
     int hut_max_code = 0xf;
 
     if (fdc_state[fdc].need_configure &&
         fdc_state[fdc].version >= FDC_82072A) {
         fdc_configure(fdc);
         fdc_state[fdc].need_configure = 0;
     }
 
     switch (raw_cmd->rate & 0x03) {
     case 3:
         dtr = 1000;
         break;
     case 1:
         dtr = 300;
         if (fdc_state[fdc].version >= FDC_82078) {
             /* chose the default rate table, not the one
              * where 1 = 2 Mbps */
             output_byte(fdc, FD_DRIVESPEC);
             if (need_more_output(fdc) == MORE_OUTPUT) {
                 output_byte(fdc, UNIT(drive));
                 output_byte(fdc, 0xc0);
             }
         }
         break;
     case 2:
         dtr = 250;
         break;
     }
 
     if (fdc_state[fdc].version >= FDC_82072) {
         scale_dtr = dtr;
         hlt_max_code = 0x00;    /* 0==256msec*dtr0/dtr (not linear!) */
         hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
     }
 
     /* Convert step rate from microseconds to milliseconds and 4 bits */
     srt = 16 - DIV_ROUND_UP(drive_params[drive].srt * scale_dtr / 1000,
                 NOMINAL_DTR);
     if (slow_floppy)
         srt = srt / 4;
 
     SUPBOUND(srt, 0xf);
     INFBOUND(srt, 0);
 
     hlt = DIV_ROUND_UP(drive_params[drive].hlt * scale_dtr / 2,
                NOMINAL_DTR);
     if (hlt < 0x01)
         hlt = 0x01;
     else if (hlt > 0x7f)
         hlt = hlt_max_code;
 
     hut = DIV_ROUND_UP(drive_params[drive].hut * scale_dtr / 16,
                NOMINAL_DTR);
     if (hut < 0x1)
         hut = 0x1;
     else if (hut > 0xf)
         hut = hut_max_code;
 
     spec1 = (srt << 4) | hut;
     spec2 = (hlt << 1) | (use_virtual_dma & 1);
 
     /* If these parameters did not change, just return with success */
     if (fdc_state[fdc].spec1 != spec1 ||
         fdc_state[fdc].spec2 != spec2) {
         /* Go ahead and set spec1 and spec2 */
         output_byte(fdc, FD_SPECIFY);
         output_byte(fdc, fdc_state[fdc].spec1 = spec1);
         output_byte(fdc, fdc_state[fdc].spec2 = spec2);
     }
 }               /* fdc_specify */
 
 /* Set the FDC's data transfer rate on behalf of the specified drive.
  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
  * of the specify command (i.e. using the fdc_specify function).
  */
 static int fdc_dtr(void)
 {
     /* If data rate not already set to desired value, set it. */
     if ((raw_cmd->rate & 3) == fdc_state[current_fdc].dtr)
         return 0;
 
     /* Set dtr */
     fdc_outb(raw_cmd->rate & 3, current_fdc, FD_DCR);
 
     /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
      * need a stabilization period of several milliseconds to be
      * enforced after data rate changes before R/W operations.
      * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
      */
     fdc_state[current_fdc].dtr = raw_cmd->rate & 3;
     return fd_wait_for_completion(jiffies + 2UL * HZ / 100, floppy_ready);
 }               /* fdc_dtr */
 
 static void tell_sector(void)
 {
     pr_cont(": track %d, head %d, sector %d, size %d",
         reply_buffer[R_TRACK], reply_buffer[R_HEAD],
         reply_buffer[R_SECTOR],
         reply_buffer[R_SIZECODE]);
 }               /* tell_sector */
 
 static void print_errors(void)
 {
     DPRINT("");
     if (reply_buffer[ST0] & ST0_ECE) {
         pr_cont("Recalibrate failed!");
     } else if (reply_buffer[ST2] & ST2_CRC) {
         pr_cont("data CRC error");
         tell_sector();
     } else if (reply_buffer[ST1] & ST1_CRC) {
         pr_cont("CRC error");
         tell_sector();
     } else if ((reply_buffer[ST1] & (ST1_MAM | ST1_ND)) ||
            (reply_buffer[ST2] & ST2_MAM)) {
         if (!probing) {
             pr_cont("sector not found");
             tell_sector();
         } else
             pr_cont("probe failed...");
     } else if (reply_buffer[ST2] & ST2_WC) {    /* seek error */
         pr_cont("wrong cylinder");
     } else if (reply_buffer[ST2] & ST2_BC) {    /* cylinder marked as bad */
         pr_cont("bad cylinder");
     } else {
         pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
             reply_buffer[ST0], reply_buffer[ST1],
             reply_buffer[ST2]);
         tell_sector();
     }
     pr_cont("\n");
 }
 
 /*
  * OK, this error interpreting routine is called after a
  * DMA read/write has succeeded
  * or failed, so we check the results, and copy any buffers.
  * hhb: Added better error reporting.
  * ak: Made this into a separate routine.
  */
 static int interpret_errors(void)
 {
     char bad;
 
     if (inr != 7) {
         DPRINT("-- FDC reply error\n");
         fdc_state[current_fdc].reset = 1;
         return 1;
     }
 
     /* check IC to find cause of interrupt */
     switch (reply_buffer[ST0] & ST0_INTR) {
     case 0x40:      /* error occurred during command execution */
         if (reply_buffer[ST1] & ST1_EOC)
             return 0;   /* occurs with pseudo-DMA */
         bad = 1;
         if (reply_buffer[ST1] & ST1_WP) {
             DPRINT("Drive is write protected\n");
             clear_bit(FD_DISK_WRITABLE_BIT,
                   &drive_state[current_drive].flags);
             cont->done(0);
             bad = 2;
         } else if (reply_buffer[ST1] & ST1_ND) {
             set_bit(FD_NEED_TWADDLE_BIT,
                 &drive_state[current_drive].flags);
         } else if (reply_buffer[ST1] & ST1_OR) {
             if (drive_params[current_drive].flags & FTD_MSG)
                 DPRINT("Over/Underrun - retrying\n");
             bad = 0;
         } else if (floppy_errors >= drive_params[current_drive].max_errors.reporting) {
             print_errors();
         }
         if (reply_buffer[ST2] & ST2_WC || reply_buffer[ST2] & ST2_BC)
             /* wrong cylinder => recal */
             drive_state[current_drive].track = NEED_2_RECAL;
         return bad;
     case 0x80:      /* invalid command given */
         DPRINT("Invalid FDC command given!\n");
         cont->done(0);
         return 2;
     case 0xc0:
         DPRINT("Abnormal termination caused by polling\n");
         cont->error();
         return 2;
     default:        /* (0) Normal command termination */
         return 0;
     }
 }
 
 /*
  * This routine is called when everything should be correctly set up
  * for the transfer (i.e. floppy motor is on, the correct floppy is
  * selected, and the head is sitting on the right track).
  */
 static void setup_rw_floppy(void)
 {
     int i;
     int r;
     int flags;
     unsigned long ready_date;
     void (*function)(void);
 
     flags = raw_cmd->flags;
     if (flags & (FD_RAW_READ | FD_RAW_WRITE))
         flags |= FD_RAW_INTR;
 
     if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
         ready_date = drive_state[current_drive].spinup_date + drive_params[current_drive].spinup;
         /* If spinup will take a long time, rerun scandrives
          * again just before spinup completion. Beware that
          * after scandrives, we must again wait for selection.
          */
         if (time_after(ready_date, jiffies + drive_params[current_drive].select_delay)) {
             ready_date -= drive_params[current_drive].select_delay;
             function = floppy_start;
         } else
             function = setup_rw_floppy;
 
         /* wait until the floppy is spinning fast enough */
         if (fd_wait_for_completion(ready_date, function))
             return;
     }
     if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
         setup_DMA();
 
     if (flags & FD_RAW_INTR)
         do_floppy = main_command_interrupt;
 
     r = 0;
     for (i = 0; i < raw_cmd->cmd_count; i++)
         r |= output_byte(current_fdc, raw_cmd->fullcmd[i]);
 
     debugt(__func__, "rw_command");
 
     if (r) {
         cont->error();
         reset_fdc();
         return;
     }
 
     if (!(flags & FD_RAW_INTR)) {
         inr = result(current_fdc);
         cont->interrupt();
     } else if (flags & FD_RAW_NEED_DISK)
         fd_watchdog();
 }
 
 static int blind_seek;
 
 /*
  * This is the routine called after every seek (or recalibrate) interrupt
  * from the floppy controller.
  */
 static void seek_interrupt(void)
 {
     debugt(__func__, "");
     if (inr != 2 || (reply_buffer[ST0] & 0xF8) != 0x20) {
         DPRINT("seek failed\n");
         drive_state[current_drive].track = NEED_2_RECAL;
         cont->error();
         cont->redo();
         return;
     }
     if (drive_state[current_drive].track >= 0 &&
         drive_state[current_drive].track != reply_buffer[ST1] &&
         !blind_seek) {
         debug_dcl(drive_params[current_drive].flags,
               "clearing NEWCHANGE flag because of effective seek\n");
         debug_dcl(drive_params[current_drive].flags, "jiffies=%lu\n",
               jiffies);
         clear_bit(FD_DISK_NEWCHANGE_BIT,
               &drive_state[current_drive].flags);
                     /* effective seek */
         drive_state[current_drive].select_date = jiffies;
     }
     drive_state[current_drive].track = reply_buffer[ST1];
     floppy_ready();
 }
 
 static void check_wp(int fdc, int drive)
 {
     if (test_bit(FD_VERIFY_BIT, &drive_state[drive].flags)) {
                     /* check write protection */
         output_byte(fdc, FD_GETSTATUS);
         output_byte(fdc, UNIT(drive));
         if (result(fdc) != 1) {
             fdc_state[fdc].reset = 1;
             return;
         }
         clear_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
         clear_bit(FD_NEED_TWADDLE_BIT,
               &drive_state[drive].flags);
         debug_dcl(drive_params[drive].flags,
               "checking whether disk is write protected\n");
         debug_dcl(drive_params[drive].flags, "wp=%x\n",
               reply_buffer[ST3] & 0x40);
         if (!(reply_buffer[ST3] & 0x40))
             set_bit(FD_DISK_WRITABLE_BIT,
                 &drive_state[drive].flags);
         else
             clear_bit(FD_DISK_WRITABLE_BIT,
                   &drive_state[drive].flags);
     }
 }
 
 static void seek_floppy(void)
 {
     int track;
 
     blind_seek = 0;
 
     debug_dcl(drive_params[current_drive].flags,
           "calling disk change from %s\n", __func__);
 
     if (!test_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags) &&
         disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
         /* the media changed flag should be cleared after the seek.
          * If it isn't, this means that there is really no disk in
          * the drive.
          */
         set_bit(FD_DISK_CHANGED_BIT,
             &drive_state[current_drive].flags);
         cont->done(0);
         cont->redo();
         return;
     }
     if (drive_state[current_drive].track <= NEED_1_RECAL) {
         recalibrate_floppy();
         return;
     } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags) &&
            (raw_cmd->flags & FD_RAW_NEED_DISK) &&
            (drive_state[current_drive].track <= NO_TRACK || drive_state[current_drive].track == raw_cmd->track)) {
         /* we seek to clear the media-changed condition. Does anybody
          * know a more elegant way, which works on all drives? */
         if (raw_cmd->track)
             track = raw_cmd->track - 1;
         else {
             if (drive_params[current_drive].flags & FD_SILENT_DCL_CLEAR) {
                 set_dor(current_fdc, ~(0x10 << UNIT(current_drive)), 0);
                 blind_seek = 1;
                 raw_cmd->flags |= FD_RAW_NEED_SEEK;
             }
             track = 1;
         }
     } else {
         check_wp(current_fdc, current_drive);
         if (raw_cmd->track != drive_state[current_drive].track &&
             (raw_cmd->flags & FD_RAW_NEED_SEEK))
             track = raw_cmd->track;
         else {
             setup_rw_floppy();
             return;
         }
     }
 
     do_floppy = seek_interrupt;
     output_byte(current_fdc, FD_SEEK);
     output_byte(current_fdc, UNIT(current_drive));
     if (output_byte(current_fdc, track) < 0) {
         reset_fdc();
         return;
     }
     debugt(__func__, "");
 }
 
 static void recal_interrupt(void)
 {
     debugt(__func__, "");
     if (inr != 2)
         fdc_state[current_fdc].reset = 1;
     else if (reply_buffer[ST0] & ST0_ECE) {
         switch (drive_state[current_drive].track) {
         case NEED_1_RECAL:
             debugt(__func__, "need 1 recal");
             /* after a second recalibrate, we still haven't
              * reached track 0. Probably no drive. Raise an
              * error, as failing immediately might upset
              * computers possessed by the Devil :-) */
             cont->error();
             cont->redo();
             return;
         case NEED_2_RECAL:
             debugt(__func__, "need 2 recal");
             /* If we already did a recalibrate,
              * and we are not at track 0, this
              * means we have moved. (The only way
              * not to move at recalibration is to
              * be already at track 0.) Clear the
              * new change flag */
             debug_dcl(drive_params[current_drive].flags,
                   "clearing NEWCHANGE flag because of second recalibrate\n");
 
             clear_bit(FD_DISK_NEWCHANGE_BIT,
                   &drive_state[current_drive].flags);
             drive_state[current_drive].select_date = jiffies;
             fallthrough;
         default:
             debugt(__func__, "default");
             /* Recalibrate moves the head by at
              * most 80 steps. If after one
              * recalibrate we don't have reached
              * track 0, this might mean that we
              * started beyond track 80.  Try
              * again.  */
             drive_state[current_drive].track = NEED_1_RECAL;
             break;
         }
     } else
         drive_state[current_drive].track = reply_buffer[ST1];
     floppy_ready();
 }
 
 static void print_result(char *message, int inr)
 {
     int i;
 
     DPRINT("%s ", message);
     if (inr >= 0)
         for (i = 0; i < inr; i++)
             pr_cont("repl[%d]=%x ", i, reply_buffer[i]);
     pr_cont("\n");
 }
 
 /* interrupt handler. Note that this can be called externally on the Sparc */
 irqreturn_t floppy_interrupt(int irq, void *dev_id)
 {
     int do_print;
     unsigned long f;
     void (*handler)(void) = do_floppy;
 
     lasthandler = handler;
     interruptjiffies = jiffies;
 
     f = claim_dma_lock();
     fd_disable_dma();
     release_dma_lock(f);
 
     do_floppy = NULL;
     if (current_fdc >= N_FDC || fdc_state[current_fdc].address == -1) {
         /* we don't even know which FDC is the culprit */
         pr_info("DOR0=%x\n", fdc_state[0].dor);
         pr_info("floppy interrupt on bizarre fdc %d\n", current_fdc);
         pr_info("handler=%ps\n", handler);
         is_alive(__func__, "bizarre fdc");
         return IRQ_NONE;
     }
 
     fdc_state[current_fdc].reset = 0;
     /* We have to clear the reset flag here, because apparently on boxes
      * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
      * emit SENSEI's to clear the interrupt line. And fdc_state[fdc].reset
      * blocks the emission of the SENSEI's.
      * It is OK to emit floppy commands because we are in an interrupt
      * handler here, and thus we have to fear no interference of other
      * activity.
      */
 
     do_print = !handler && print_unex && initialized;
 
     inr = result(current_fdc);
     if (do_print)
         print_result("unexpected interrupt", inr);
     if (inr == 0) {
         int max_sensei = 4;
         do {
             output_byte(current_fdc, FD_SENSEI);
             inr = result(current_fdc);
             if (do_print)
                 print_result("sensei", inr);
             max_sensei--;
         } while ((reply_buffer[ST0] & 0x83) != UNIT(current_drive) &&
              inr == 2 && max_sensei);
     }
     if (!handler) {
         fdc_state[current_fdc].reset = 1;
         return IRQ_NONE;
     }
     schedule_bh(handler);
     is_alive(__func__, "normal interrupt end");
 
     /* FIXME! Was it really for us? */
     return IRQ_HANDLED;
 }
 
 static void recalibrate_floppy(void)
 {
     debugt(__func__, "");
     do_floppy = recal_interrupt;
     output_byte(current_fdc, FD_RECALIBRATE);
     if (output_byte(current_fdc, UNIT(current_drive)) < 0)
         reset_fdc();
 }
 
 /*
  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
  */
 static void reset_interrupt(void)
 {
     debugt(__func__, "");
     result(current_fdc);        /* get the status ready for set_fdc */
     if (fdc_state[current_fdc].reset) {
         pr_info("reset set in interrupt, calling %ps\n", cont->error);
         cont->error();  /* a reset just after a reset. BAD! */
     }
     cont->redo();
 }
 
 /*
  * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
  * or by setting the self clearing bit 7 of STATUS (newer FDCs).
  * This WILL trigger an interrupt, causing the handlers in the current
  * cont's ->redo() to be called via reset_interrupt().
  */
 static void reset_fdc(void)
 {
     unsigned long flags;
 
     do_floppy = reset_interrupt;
     fdc_state[current_fdc].reset = 0;
     reset_fdc_info(current_fdc, 0);
 
     /* Pseudo-DMA may intercept 'reset finished' interrupt.  */
     /* Irrelevant for systems with true DMA (i386).          */
 
     flags = claim_dma_lock();
     fd_disable_dma();
     release_dma_lock(flags);
 
     if (fdc_state[current_fdc].version >= FDC_82072A)
         fdc_outb(0x80 | (fdc_state[current_fdc].dtr & 3),
              current_fdc, FD_STATUS);
     else {
         fdc_outb(fdc_state[current_fdc].dor & ~0x04, current_fdc, FD_DOR);
         udelay(FD_RESET_DELAY);
         fdc_outb(fdc_state[current_fdc].dor, current_fdc, FD_DOR);
     }
 }
 
 static void show_floppy(int fdc)
 {
     int i;
 
     pr_info("\n");
     pr_info("floppy driver state\n");
     pr_info("-------------------\n");
     pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%ps\n",
         jiffies, interruptjiffies, jiffies - interruptjiffies,
         lasthandler);
 
     pr_info("timeout_message=%s\n", timeout_message);
     pr_info("last output bytes:\n");
     for (i = 0; i < OLOGSIZE; i++)
         pr_info("%2x %2x %lu\n",
             output_log[(i + output_log_pos) % OLOGSIZE].data,
             output_log[(i + output_log_pos) % OLOGSIZE].status,
             output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
     pr_info("last result at %lu\n", resultjiffies);
     pr_info("last redo_fd_request at %lu\n", lastredo);
     print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1,
                reply_buffer, resultsize, true);
 
     pr_info("status=%x\n", fdc_inb(fdc, FD_STATUS));
     pr_info("fdc_busy=%lu\n", fdc_busy);
     if (do_floppy)
         pr_info("do_floppy=%ps\n", do_floppy);
     if (work_pending(&floppy_work))
         pr_info("floppy_work.func=%ps\n", floppy_work.func);
     if (delayed_work_pending(&fd_timer))
         pr_info("delayed work.function=%p expires=%ld\n",
                fd_timer.work.func,
                fd_timer.timer.expires - jiffies);
     if (delayed_work_pending(&fd_timeout))
         pr_info("timer_function=%p expires=%ld\n",
                fd_timeout.work.func,
                fd_timeout.timer.expires - jiffies);
 
     pr_info("cont=%p\n", cont);
     pr_info("current_req=%p\n", current_req);
     pr_info("command_status=%d\n", command_status);
     pr_info("\n");
 }
 
 static void floppy_shutdown(struct work_struct *arg)
 {
     unsigned long flags;
 
     if (initialized)
         show_floppy(current_fdc);
     cancel_activity();
 
     flags = claim_dma_lock();
     fd_disable_dma();
     release_dma_lock(flags);
 
     /* avoid dma going to a random drive after shutdown */
 
     if (initialized)
         DPRINT("floppy timeout called\n");
     fdc_state[current_fdc].reset = 1;
     if (cont) {
         cont->done(0);
         cont->redo();   /* this will recall reset when needed */
     } else {
         pr_info("no cont in shutdown!\n");
         process_fd_request();
     }
     is_alive(__func__, "");
 }
 
 /* start motor, check media-changed condition and write protection */
 static int start_motor(void (*function)(void))
 {
     int mask;
     int data;
 
     mask = 0xfc;
     data = UNIT(current_drive);
     if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
         if (!(fdc_state[current_fdc].dor & (0x10 << UNIT(current_drive)))) {
             set_debugt();
             /* no read since this drive is running */
             drive_state[current_drive].first_read_date = 0;
             /* note motor start time if motor is not yet running */
             drive_state[current_drive].spinup_date = jiffies;
             data |= (0x10 << UNIT(current_drive));
         }
     } else if (fdc_state[current_fdc].dor & (0x10 << UNIT(current_drive)))
         mask &= ~(0x10 << UNIT(current_drive));
 
     /* starts motor and selects floppy */
     del_timer(motor_off_timer + current_drive);
     set_dor(current_fdc, mask, data);
 
     /* wait_for_completion also schedules reset if needed. */
     return fd_wait_for_completion(drive_state[current_drive].select_date + drive_params[current_drive].select_delay,
                       function);
 }
 
 static void floppy_ready(void)
 {
     if (fdc_state[current_fdc].reset) {
         reset_fdc();
         return;
     }
     if (start_motor(floppy_ready))
         return;
     if (fdc_dtr())
         return;
 
     debug_dcl(drive_params[current_drive].flags,
           "calling disk change from floppy_ready\n");
     if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
         disk_change(current_drive) && !drive_params[current_drive].select_delay)
         twaddle(current_fdc, current_drive);    /* this clears the dcl on certain
                  * drive/controller combinations */
 
 #ifdef fd_chose_dma_mode
     if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
         unsigned long flags = claim_dma_lock();
         fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
         release_dma_lock(flags);
     }
 #endif
 
     if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
         perpendicular_mode(current_fdc);
         fdc_specify(current_fdc, current_drive); /* must be done here because of hut, hlt ... */
         seek_floppy();
     } else {
         if ((raw_cmd->flags & FD_RAW_READ) ||
             (raw_cmd->flags & FD_RAW_WRITE))
             fdc_specify(current_fdc, current_drive);
         setup_rw_floppy();
     }
 }
 
 static void floppy_start(void)
 {
     reschedule_timeout(current_drive, "floppy start");
 
     scandrives();
     debug_dcl(drive_params[current_drive].flags,
           "setting NEWCHANGE in floppy_start\n");
     set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags);
     floppy_ready();
 }
 
 /*
  * ========================================================================
  * here ends the bottom half. Exported routines are:
  * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
  * Initialization also uses output_byte, result, set_dor, floppy_interrupt
  * and set_dor.
  * ========================================================================
  */
 /*
  * General purpose continuations.
  * ==============================
  */
 
 static void do_wakeup(void)
 {
     reschedule_timeout(MAXTIMEOUT, "do wakeup");
     cont = NULL;
     command_status += 2;
     wake_up(&command_done);
 }
 
 static const struct cont_t wakeup_cont = {
     .interrupt  = empty,
     .redo       = do_wakeup,
     .error      = empty,
     .done       = (done_f)empty
 };
 
 static const struct cont_t intr_cont = {
     .interrupt  = empty,
     .redo       = process_fd_request,
     .error      = empty,
     .done       = (done_f)empty
 };
 
 /* schedules handler, waiting for completion. May be interrupted, will then
  * return -EINTR, in which case the driver will automatically be unlocked.
  */
 static int wait_til_done(void (*handler)(void), bool interruptible)
 {
     int ret;
 
     schedule_bh(handler);
 
     if (interruptible)
         wait_event_interruptible(command_done, command_status >= 2);
     else
         wait_event(command_done, command_status >= 2);
 
     if (command_status < 2) {
         cancel_activity();
         cont = &intr_cont;
         reset_fdc();
         return -EINTR;
     }
 
     if (fdc_state[current_fdc].reset)
         command_status = FD_COMMAND_ERROR;
     if (command_status == FD_COMMAND_OKAY)
         ret = 0;
     else
         ret = -EIO;
     command_status = FD_COMMAND_NONE;
     return ret;
 }
 
 static void generic_done(int result)
 {
     command_status = result;
     cont = &wakeup_cont;
 }
 
 static void generic_success(void)
 {
     cont->done(1);
 }
 
 static void generic_failure(void)
 {
     cont->done(0);
 }
 
 static void success_and_wakeup(void)
 {
     generic_success();
     cont->redo();
 }
 
 /*
  * formatting and rw support.
  * ==========================
  */
 
 static int next_valid_format(int drive)
 {
     int probed_format;
 
     probed_format = drive_state[drive].probed_format;
     while (1) {
         if (probed_format >= FD_AUTODETECT_SIZE ||
             !drive_params[drive].autodetect[probed_format]) {
             drive_state[drive].probed_format = 0;
             return 1;
         }
         if (floppy_type[drive_params[drive].autodetect[probed_format]].sect) {
             drive_state[drive].probed_format = probed_format;
             return 0;
         }
         probed_format++;
     }
 }
 
 static void bad_flp_intr(void)
 {
     int err_count;
 
     if (probing) {
         drive_state[current_drive].probed_format++;
         if (!next_valid_format(current_drive))
             return;
     }
     err_count = ++floppy_errors;
     INFBOUND(write_errors[current_drive].badness, err_count);
     if (err_count > drive_params[current_drive].max_errors.abort)
         cont->done(0);
     if (err_count > drive_params[current_drive].max_errors.reset)
         fdc_state[current_fdc].reset = 1;
     else if (err_count > drive_params[current_drive].max_errors.recal)
         drive_state[current_drive].track = NEED_2_RECAL;
 }
 
 static void set_floppy(int drive)
 {
     int type = ITYPE(drive_state[drive].fd_device);
 
     if (type)
         _floppy = floppy_type + type;
     else
         _floppy = current_type[drive];
 }
 
 /*
  * formatting support.
  * ===================
  */
 static void format_interrupt(void)
 {
     switch (interpret_errors()) {
     case 1:
         cont->error();
         break;
     case 2:
         break;
     case 0:
         cont->done(1);
     }
     cont->redo();
 }
 
 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1))
 #define CT(x) ((x) | 0xc0)
 
 static void setup_format_params(int track)
 {
     int n;
     int il;
     int count;
     int head_shift;
     int track_shift;
     struct fparm {
         unsigned char track, head, sect, size;
     } *here = (struct fparm *)floppy_track_buffer;
 
     raw_cmd = &default_raw_cmd;
     raw_cmd->track = track;
 
     raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
               FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK);
     raw_cmd->rate = _floppy->rate & 0x43;
     raw_cmd->cmd_count = NR_F;
     raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_FORMAT);
     raw_cmd->cmd[DR_SELECT] = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
     raw_cmd->cmd[F_SIZECODE] = FD_SIZECODE(_floppy);
     raw_cmd->cmd[F_SECT_PER_TRACK] = _floppy->sect << 2 >> raw_cmd->cmd[F_SIZECODE];
     raw_cmd->cmd[F_GAP] = _floppy->fmt_gap;
     raw_cmd->cmd[F_FILL] = FD_FILL_BYTE;
 
     raw_cmd->kernel_data = floppy_track_buffer;
     raw_cmd->length = 4 * raw_cmd->cmd[F_SECT_PER_TRACK];
 
     if (!raw_cmd->cmd[F_SECT_PER_TRACK])
         return;
 
     /* allow for about 30ms for data transport per track */
     head_shift = (raw_cmd->cmd[F_SECT_PER_TRACK] + 5) / 6;
 
     /* a ``cylinder'' is two tracks plus a little stepping time */
     track_shift = 2 * head_shift + 3;
 
     /* position of logical sector 1 on this track */
     n = (track_shift * format_req.track + head_shift * format_req.head)
         % raw_cmd->cmd[F_SECT_PER_TRACK];
 
     /* determine interleave */
     il = 1;
     if (_floppy->fmt_gap < 0x22)
         il++;
 
     /* initialize field */
     for (count = 0; count < raw_cmd->cmd[F_SECT_PER_TRACK]; ++count) {
         here[count].track = format_req.track;
         here[count].head = format_req.head;
         here[count].sect = 0;
         here[count].size = raw_cmd->cmd[F_SIZECODE];
     }
     /* place logical sectors */
     for (count = 1; count <= raw_cmd->cmd[F_SECT_PER_TRACK]; ++count) {
         here[n].sect = count;
         n = (n + il) % raw_cmd->cmd[F_SECT_PER_TRACK];
         if (here[n].sect) { /* sector busy, find next free sector */
             ++n;
             if (n >= raw_cmd->cmd[F_SECT_PER_TRACK]) {
                 n -= raw_cmd->cmd[F_SECT_PER_TRACK];
                 while (here[n].sect)
                     ++n;
             }
         }
     }
     if (_floppy->stretch & FD_SECTBASEMASK) {
         for (count = 0; count < raw_cmd->cmd[F_SECT_PER_TRACK]; count++)
             here[count].sect += FD_SECTBASE(_floppy) - 1;
     }
 }
 
 static void redo_format(void)
 {
     buffer_track = -1;
     setup_format_params(format_req.track << STRETCH(_floppy));
     floppy_start();
     debugt(__func__, "queue format request");
 }
 
 static const struct cont_t format_cont = {
     .interrupt  = format_interrupt,
     .redo       = redo_format,
     .error      = bad_flp_intr,
     .done       = generic_done
 };
 
 static int do_format(int drive, struct format_descr *tmp_format_req)
 {
     int ret;
 
     if (lock_fdc(drive))
         return -EINTR;
 
     set_floppy(drive);
     if (!_floppy ||
         _floppy->track > drive_params[current_drive].tracks ||
         tmp_format_req->track >= _floppy->track ||
         tmp_format_req->head >= _floppy->head ||
         (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
         !_floppy->fmt_gap) {
         process_fd_request();
         return -EINVAL;
     }
     format_req = *tmp_format_req;
     cont = &format_cont;
     floppy_errors = 0;
     ret = wait_til_done(redo_format, true);
     if (ret == -EINTR)
         return -EINTR;
     process_fd_request();
     return ret;
 }
 
 /*
  * Buffer read/write and support
  * =============================
  */
 
 static void floppy_end_request(struct request *req, blk_status_t error)
 {
     unsigned int nr_sectors = current_count_sectors;
     unsigned int drive = (unsigned long)req->q->disk->private_data;
 
     /* current_count_sectors can be zero if transfer failed */
     if (error)
         nr_sectors = blk_rq_cur_sectors(req);
     if (blk_update_request(req, error, nr_sectors << 9))
         return;
     __blk_mq_end_request(req, error);
 
     /* We're done with the request */
     floppy_off(drive);
     current_req = NULL;
 }
 
 /* new request_done. Can handle physical sectors which are smaller than a
  * logical buffer */
 static void request_done(int uptodate)
 {
     struct request *req = current_req;
     int block;
     char msg[sizeof("request done ") + sizeof(int) * 3];
 
     probing = 0;
     snprintf(msg, sizeof(msg), "request done %d", uptodate);
     reschedule_timeout(MAXTIMEOUT, msg);
 
     if (!req) {
         pr_info("floppy.c: no request in request_done\n");
         return;
     }
 
     if (uptodate) {
         /* maintain values for invalidation on geometry
          * change */
         block = current_count_sectors + blk_rq_pos(req);
         INFBOUND(drive_state[current_drive].maxblock, block);
         if (block > _floppy->sect)
             drive_state[current_drive].maxtrack = 1;
 
         floppy_end_request(req, 0);
     } else {
         if (rq_data_dir(req) == WRITE) {
             /* record write error information */
             write_errors[current_drive].write_errors++;
             if (write_errors[current_drive].write_errors == 1) {
                 write_errors[current_drive].first_error_sector = blk_rq_pos(req);
                 write_errors[current_drive].first_error_generation = drive_state[current_drive].generation;
             }
             write_errors[current_drive].last_error_sector = blk_rq_pos(req);
             write_errors[current_drive].last_error_generation = drive_state[current_drive].generation;
         }
         floppy_end_request(req, BLK_STS_IOERR);
     }
 }
 
 /* Interrupt handler evaluating the result of the r/w operation */
 static void rw_interrupt(void)
 {
     int eoc;
     int ssize;
     int heads;
     int nr_sectors;
 
     if (reply_buffer[R_HEAD] >= 2) {
         /* some Toshiba floppy controllers occasionnally seem to
          * return bogus interrupts after read/write operations, which
          * can be recognized by a bad head number (>= 2) */
         return;
     }
 
     if (!drive_state[current_drive].first_read_date)
         drive_state[current_drive].first_read_date = jiffies;
 
     ssize = DIV_ROUND_UP(1 << raw_cmd->cmd[SIZECODE], 4);
 
     if (reply_buffer[ST1] & ST1_EOC)
         eoc = 1;
     else
         eoc = 0;
 
     if (raw_cmd->cmd[COMMAND] & 0x80)
         heads = 2;
     else
         heads = 1;
 
     nr_sectors = (((reply_buffer[R_TRACK] - raw_cmd->cmd[TRACK]) * heads +
                reply_buffer[R_HEAD] - raw_cmd->cmd[HEAD]) * raw_cmd->cmd[SECT_PER_TRACK] +
               reply_buffer[R_SECTOR] - raw_cmd->cmd[SECTOR] + eoc) << raw_cmd->cmd[SIZECODE] >> 2;
 
     if (nr_sectors / ssize >
         DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
         DPRINT("long rw: %x instead of %lx\n",
                nr_sectors, current_count_sectors);
         pr_info("rs=%d s=%d\n", reply_buffer[R_SECTOR],
             raw_cmd->cmd[SECTOR]);
         pr_info("rh=%d h=%d\n", reply_buffer[R_HEAD],
             raw_cmd->cmd[HEAD]);
         pr_info("rt=%d t=%d\n", reply_buffer[R_TRACK],
             raw_cmd->cmd[TRACK]);
         pr_info("heads=%d eoc=%d\n", heads, eoc);
         pr_info("spt=%d st=%d ss=%d\n",
             raw_cmd->cmd[SECT_PER_TRACK], fsector_t, ssize);
         pr_info("in_sector_offset=%d\n", in_sector_offset);
     }
 
     nr_sectors -= in_sector_offset;
     INFBOUND(nr_sectors, 0);
     SUPBOUND(current_count_sectors, nr_sectors);
 
     switch (interpret_errors()) {
     case 2:
         cont->redo();
         return;
     case 1:
         if (!current_count_sectors) {
             cont->error();
             cont->redo();
             return;
         }
         break;
     case 0:
         if (!current_count_sectors) {
             cont->redo();
             return;
         }
         current_type[current_drive] = _floppy;
         floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
         break;
     }
 
     if (probing) {
         if (drive_params[current_drive].flags & FTD_MSG)
             DPRINT("Auto-detected floppy type %s in fd%d\n",
                    _floppy->name, current_drive);
         current_type[current_drive] = _floppy;
         floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
         probing = 0;
     }
 
     if (CT(raw_cmd->cmd[COMMAND]) != FD_READ) {
         /* transfer directly from buffer */
         cont->done(1);
     } else {
         buffer_track = raw_cmd->track;
         buffer_drive = current_drive;
         INFBOUND(buffer_max, nr_sectors + fsector_t);
     }
     cont->redo();
 }
 
 /* Compute the maximal transfer size */
 static int transfer_size(int ssize, int max_sector, int max_size)
 {
     SUPBOUND(max_sector, fsector_t + max_size);
 
     /* alignment */
     max_sector -= (max_sector % _floppy->sect) % ssize;
 
     /* transfer size, beginning not aligned */
     current_count_sectors = max_sector - fsector_t;
 
     return max_sector;
 }
 
 /*
  * Move data from/to the track buffer to/from the buffer cache.
  */
 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
 {
     int remaining;      /* number of transferred 512-byte sectors */
     struct bio_vec bv;
     char *dma_buffer;
     int size;
     struct req_iterator iter;
 
     max_sector = transfer_size(ssize,
                    min(max_sector, max_sector_2),
                    blk_rq_sectors(current_req));
 
     if (current_count_sectors <= 0 && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE &&
         buffer_max > fsector_t + blk_rq_sectors(current_req))
         current_count_sectors = min_t(int, buffer_max - fsector_t,
                           blk_rq_sectors(current_req));
 
     remaining = current_count_sectors << 9;
     if (remaining > blk_rq_bytes(current_req) && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
         DPRINT("in copy buffer\n");
         pr_info("current_count_sectors=%ld\n", current_count_sectors);
         pr_info("remaining=%d\n", remaining >> 9);
         pr_info("current_req->nr_sectors=%u\n",
             blk_rq_sectors(current_req));
         pr_info("current_req->current_nr_sectors=%u\n",
             blk_rq_cur_sectors(current_req));
         pr_info("max_sector=%d\n", max_sector);
         pr_info("ssize=%d\n", ssize);
     }
 
     buffer_max = max(max_sector, buffer_max);
 
     dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
 
     size = blk_rq_cur_bytes(current_req);
 
     rq_for_each_segment(bv, current_req, iter) {
         if (!remaining)
             break;
 
         size = bv.bv_len;
         SUPBOUND(size, remaining);
         if (dma_buffer + size >
             floppy_track_buffer + (max_buffer_sectors << 10) ||
             dma_buffer < floppy_track_buffer) {
             DPRINT("buffer overrun in copy buffer %d\n",
                    (int)((floppy_track_buffer - dma_buffer) >> 9));
             pr_info("fsector_t=%d buffer_min=%d\n",
                 fsector_t, buffer_min);
             pr_info("current_count_sectors=%ld\n",
                 current_count_sectors);
             if (CT(raw_cmd->cmd[COMMAND]) == FD_READ)
                 pr_info("read\n");
             if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE)
                 pr_info("write\n");
             break;
         }
 
         if (CT(raw_cmd->cmd[COMMAND]) == FD_READ)
             memcpy_to_bvec(&bv, dma_buffer);
         else
             memcpy_from_bvec(dma_buffer, &bv);
 
         remaining -= size;
         dma_buffer += size;
     }
     if (remaining) {
         if (remaining > 0)
             max_sector -= remaining >> 9;
         DPRINT("weirdness: remaining %d\n", remaining >> 9);
     }
 }
 
 /* work around a bug in pseudo DMA
  * (on some FDCs) pseudo DMA does not stop when the CPU stops
  * sending data.  Hence we need a different way to signal the
  * transfer length:  We use raw_cmd->cmd[SECT_PER_TRACK].  Unfortunately, this
  * does not work with MT, hence we can only transfer one head at
  * a time
  */
 static void virtualdmabug_workaround(void)
 {
     int hard_sectors;
     int end_sector;
 
     if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
         raw_cmd->cmd[COMMAND] &= ~0x80; /* switch off multiple track mode */
 
         hard_sectors = raw_cmd->length >> (7 + raw_cmd->cmd[SIZECODE]);
         end_sector = raw_cmd->cmd[SECTOR] + hard_sectors - 1;
         if (end_sector > raw_cmd->cmd[SECT_PER_TRACK]) {
             pr_info("too many sectors %d > %d\n",
                 end_sector, raw_cmd->cmd[SECT_PER_TRACK]);
             return;
         }
         raw_cmd->cmd[SECT_PER_TRACK] = end_sector;
                     /* make sure raw_cmd->cmd[SECT_PER_TRACK]
                      * points to end of transfer */
     }
 }
 
 /*
  * Formulate a read/write request.
  * this routine decides where to load the data (directly to buffer, or to
  * tmp floppy area), how much data to load (the size of the buffer, the whole
  * track, or a single sector)
  * All floppy_track_buffer handling goes in here. If we ever add track buffer
  * allocation on the fly, it should be done here. No other part should need
  * modification.
  */
 
 static int make_raw_rw_request(void)
 {
     int aligned_sector_t;
     int max_sector;
     int max_size;
     int tracksize;
     int ssize;
 
     if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n"))
         return 0;
 
     set_fdc((long)current_req->q->disk->private_data);
 
     raw_cmd = &default_raw_cmd;
     raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK;
     raw_cmd->cmd_count = NR_RW;
     if (rq_data_dir(current_req) == READ) {
         raw_cmd->flags |= FD_RAW_READ;
         raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_READ);
     } else if (rq_data_dir(current_req) == WRITE) {
         raw_cmd->flags |= FD_RAW_WRITE;
         raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_WRITE);
     } else {
         DPRINT("%s: unknown command\n", __func__);
         return 0;
     }
 
     max_sector = _floppy->sect * _floppy->head;
 
     raw_cmd->cmd[TRACK] = (int)blk_rq_pos(current_req) / max_sector;
     fsector_t = (int)blk_rq_pos(current_req) % max_sector;
     if (_floppy->track && raw_cmd->cmd[TRACK] >= _floppy->track) {
         if (blk_rq_cur_sectors(current_req) & 1) {
             current_count_sectors = 1;
             return 1;
         } else
             return 0;
     }
     raw_cmd->cmd[HEAD] = fsector_t / _floppy->sect;
 
     if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
          test_bit(FD_NEED_TWADDLE_BIT, &drive_state[current_drive].flags)) &&
         fsector_t < _floppy->sect)
         max_sector = _floppy->sect;
 
     /* 2M disks have phantom sectors on the first track */
     if ((_floppy->rate & FD_2M) && (!raw_cmd->cmd[TRACK]) && (!raw_cmd->cmd[HEAD])) {
         max_sector = 2 * _floppy->sect / 3;
         if (fsector_t >= max_sector) {
             current_count_sectors =
                 min_t(int, _floppy->sect - fsector_t,
                   blk_rq_sectors(current_req));
             return 1;
         }
         raw_cmd->cmd[SIZECODE] = 2;
     } else
         raw_cmd->cmd[SIZECODE] = FD_SIZECODE(_floppy);
     raw_cmd->rate = _floppy->rate & 0x43;
     if ((_floppy->rate & FD_2M) &&
         (raw_cmd->cmd[TRACK] || raw_cmd->cmd[HEAD]) && raw_cmd->rate == 2)
         raw_cmd->rate = 1;
 
     if (raw_cmd->cmd[SIZECODE])
         raw_cmd->cmd[SIZECODE2] = 0xff;
     else
         raw_cmd->cmd[SIZECODE2] = 0x80;
     raw_cmd->track = raw_cmd->cmd[TRACK] << STRETCH(_floppy);
     raw_cmd->cmd[DR_SELECT] = UNIT(current_drive) + PH_HEAD(_floppy, raw_cmd->cmd[HEAD]);
     raw_cmd->cmd[GAP] = _floppy->gap;
     ssize = DIV_ROUND_UP(1 << raw_cmd->cmd[SIZECODE], 4);
     raw_cmd->cmd[SECT_PER_TRACK] = _floppy->sect << 2 >> raw_cmd->cmd[SIZECODE];
     raw_cmd->cmd[SECTOR] = ((fsector_t % _floppy->sect) << 2 >> raw_cmd->cmd[SIZECODE]) +
         FD_SECTBASE(_floppy);
 
     /* tracksize describes the size which can be filled up with sectors
      * of size ssize.
      */
     tracksize = _floppy->sect - _floppy->sect % ssize;
     if (tracksize < _floppy->sect) {
         raw_cmd->cmd[SECT_PER_TRACK]++;
         if (tracksize <= fsector_t % _floppy->sect)
             raw_cmd->cmd[SECTOR]--;
 
         /* if we are beyond tracksize, fill up using smaller sectors */
         while (tracksize <= fsector_t % _floppy->sect) {
             while (tracksize + ssize > _floppy->sect) {
                 raw_cmd->cmd[SIZECODE]--;
                 ssize >>= 1;
             }
             raw_cmd->cmd[SECTOR]++;
             raw_cmd->cmd[SECT_PER_TRACK]++;
             tracksize += ssize;
         }
         max_sector = raw_cmd->cmd[HEAD] * _floppy->sect + tracksize;
     } else if (!raw_cmd->cmd[TRACK] && !raw_cmd->cmd[HEAD] && !(_floppy->rate & FD_2M) && probing) {
         max_sector = _floppy->sect;
     } else if (!raw_cmd->cmd[HEAD] && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
         /* for virtual DMA bug workaround */
         max_sector = _floppy->sect;
     }
 
     in_sector_offset = (fsector_t % _floppy->sect) % ssize;
     aligned_sector_t = fsector_t - in_sector_offset;
     max_size = blk_rq_sectors(current_req);
     if ((raw_cmd->track == buffer_track) &&
         (current_drive == buffer_drive) &&
         (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
         /* data already in track buffer */
         if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) {
             copy_buffer(1, max_sector, buffer_max);
             return 1;
         }
     } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
         if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
             unsigned int sectors;
 
             sectors = fsector_t + blk_rq_sectors(current_req);
             if (sectors > ssize && sectors < ssize + ssize)
                 max_size = ssize + ssize;
             else
                 max_size = ssize;
         }
         raw_cmd->flags &= ~FD_RAW_WRITE;
         raw_cmd->flags |= FD_RAW_READ;
         raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_READ);
     }
 
     if (CT(raw_cmd->cmd[COMMAND]) == FD_READ)
         max_size = max_sector;  /* unbounded */
 
     /* claim buffer track if needed */
     if (buffer_track != raw_cmd->track ||   /* bad track */
         buffer_drive != current_drive ||    /* bad drive */
         fsector_t > buffer_max ||
         fsector_t < buffer_min ||
         ((CT(raw_cmd->cmd[COMMAND]) == FD_READ ||
           (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
          max_sector > 2 * max_buffer_sectors + buffer_min &&
          max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) {
         /* not enough space */
         buffer_track = -1;
         buffer_drive = current_drive;
         buffer_max = buffer_min = aligned_sector_t;
     }
     raw_cmd->kernel_data = floppy_track_buffer +
         ((aligned_sector_t - buffer_min) << 9);
 
     if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
         /* copy write buffer to track buffer.
          * if we get here, we know that the write
          * is either aligned or the data already in the buffer
          * (buffer will be overwritten) */
         if (in_sector_offset && buffer_track == -1)
             DPRINT("internal error offset !=0 on write\n");
         buffer_track = raw_cmd->track;
         buffer_drive = current_drive;
         copy_buffer(ssize, max_sector,
                 2 * max_buffer_sectors + buffer_min);
     } else
         transfer_size(ssize, max_sector,
                   2 * max_buffer_sectors + buffer_min -
                   aligned_sector_t);
 
     /* round up current_count_sectors to get dma xfer size */
     raw_cmd->length = in_sector_offset + current_count_sectors;
     raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
     raw_cmd->length <<= 9;
     if ((raw_cmd->length < current_count_sectors << 9) ||
         (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE &&
          (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
           aligned_sector_t < buffer_min)) ||
         raw_cmd->length % (128 << raw_cmd->cmd[SIZECODE]) ||
         raw_cmd->length <= 0 || current_count_sectors <= 0) {
         DPRINT("fractionary current count b=%lx s=%lx\n",
                raw_cmd->length, current_count_sectors);
         pr_info("addr=%d, length=%ld\n",
             (int)((raw_cmd->kernel_data -
                    floppy_track_buffer) >> 9),
             current_count_sectors);
         pr_info("st=%d ast=%d mse=%d msi=%d\n",
             fsector_t, aligned_sector_t, max_sector, max_size);
         pr_info("ssize=%x SIZECODE=%d\n", ssize, raw_cmd->cmd[SIZECODE]);
         pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
             raw_cmd->cmd[COMMAND], raw_cmd->cmd[SECTOR],
             raw_cmd->cmd[HEAD], raw_cmd->cmd[TRACK]);
         pr_info("buffer drive=%d\n", buffer_drive);
         pr_info("buffer track=%d\n", buffer_track);
         pr_info("buffer_min=%d\n", buffer_min);
         pr_info("buffer_max=%d\n", buffer_max);
         return 0;
     }
 
     if (raw_cmd->kernel_data < floppy_track_buffer ||
         current_count_sectors < 0 ||
         raw_cmd->length < 0 ||
         raw_cmd->kernel_data + raw_cmd->length >
         floppy_track_buffer + (max_buffer_sectors << 10)) {
         DPRINT("buffer overrun in schedule dma\n");
         pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n",
             fsector_t, buffer_min, raw_cmd->length >> 9);
         pr_info("current_count_sectors=%ld\n",
             current_count_sectors);
         if (CT(raw_cmd->cmd[COMMAND]) == FD_READ)
             pr_info("read\n");
         if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE)
             pr_info("write\n");
         return 0;
     }
     if (raw_cmd->length == 0) {
         DPRINT("zero dma transfer attempted from make_raw_request\n");
         return 0;
     }
 
     virtualdmabug_workaround();
     return 2;
 }
 
 static int set_next_request(void)
 {
     current_req = list_first_entry_or_null(&floppy_reqs, struct request,
                            queuelist);
     if (current_req) {
         floppy_errors = 0;
         list_del_init(&current_req->queuelist);
         return 1;
     }
     return 0;
 }
 
 /* Starts or continues processing request. Will automatically unlock the
  * driver at end of request.
  */
 static void redo_fd_request(void)
 {
     int drive;
     int tmp;
 
     lastredo = jiffies;
     if (current_drive < N_DRIVE)
         floppy_off(current_drive);
 
 do_request:
     if (!current_req) {
         int pending;
 
         spin_lock_irq(&floppy_lock);
         pending = set_next_request();
         spin_unlock_irq(&floppy_lock);
         if (!pending) {
             do_floppy = NULL;
             unlock_fdc();
             return;
         }
     }
     drive = (long)current_req->q->disk->private_data;
     set_fdc(drive);
     reschedule_timeout(current_drive, "redo fd request");
 
     set_floppy(drive);
     raw_cmd = &default_raw_cmd;
     raw_cmd->flags = 0;
     if (start_motor(redo_fd_request))
         return;
 
     disk_change(current_drive);
     if (test_bit(current_drive, &fake_change) ||
         test_bit(FD_DISK_CHANGED_BIT, &drive_state[current_drive].flags)) {
         DPRINT("disk absent or changed during operation\n");
         request_done(0);
         goto do_request;
     }
     if (!_floppy) { /* Autodetection */
         if (!probing) {
             drive_state[current_drive].probed_format = 0;
             if (next_valid_format(current_drive)) {
                 DPRINT("no autodetectable formats\n");
                 _floppy = NULL;
                 request_done(0);
                 goto do_request;
             }
         }
         probing = 1;
         _floppy = floppy_type + drive_params[current_drive].autodetect[drive_state[current_drive].probed_format];
     } else
         probing = 0;
     tmp = make_raw_rw_request();
     if (tmp < 2) {
         request_done(tmp);
         goto do_request;
     }
 
     if (test_bit(FD_NEED_TWADDLE_BIT, &drive_state[current_drive].flags))
         twaddle(current_fdc, current_drive);
     schedule_bh(floppy_start);
     debugt(__func__, "queue fd request");
     return;
 }
 
 static const struct cont_t rw_cont = {
     .interrupt  = rw_interrupt,
     .redo       = redo_fd_request,
     .error      = bad_flp_intr,
     .done       = request_done
 };
 
 /* schedule the request and automatically unlock the driver on completion */
 static void process_fd_request(void)
 {
     cont = &rw_cont;
     schedule_bh(redo_fd_request);
 }
 
 static blk_status_t floppy_queue_rq(struct blk_mq_hw_ctx *hctx,
                     const struct blk_mq_queue_data *bd)
 {
     blk_mq_start_request(bd->rq);
 
     if (WARN(max_buffer_sectors == 0,
          "VFS: %s called on non-open device\n", __func__))
         return BLK_STS_IOERR;
 
     if (WARN(atomic_read(&usage_count) == 0,
          "warning: usage count=0, current_req=%p sect=%ld flags=%llx\n",
          current_req, (long)blk_rq_pos(current_req),
          (__force unsigned long long) current_req->cmd_flags))
         return BLK_STS_IOERR;
 
     if (test_and_set_bit(0, &fdc_busy)) {
         /* fdc busy, this new request will be treated when the
            current one is done */
         is_alive(__func__, "old request running");
         return BLK_STS_RESOURCE;
     }
 
     spin_lock_irq(&floppy_lock);
     list_add_tail(&bd->rq->queuelist, &floppy_reqs);
     spin_unlock_irq(&floppy_lock);
 
     command_status = FD_COMMAND_NONE;
     __reschedule_timeout(MAXTIMEOUT, "fd_request");
     set_fdc(0);
     process_fd_request();
     is_alive(__func__, "");
     return BLK_STS_OK;
 }
 
 static const struct cont_t poll_cont = {
     .interrupt  = success_and_wakeup,
     .redo       = floppy_ready,
     .error      = generic_failure,
     .done       = generic_done
 };
 
 static int poll_drive(bool interruptible, int flag)
 {
     /* no auto-sense, just clear dcl */
     raw_cmd = &default_raw_cmd;
     raw_cmd->flags = flag;
     raw_cmd->track = 0;
     raw_cmd->cmd_count = 0;
     cont = &poll_cont;
     debug_dcl(drive_params[current_drive].flags,
           "setting NEWCHANGE in poll_drive\n");
     set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags);
 
     return wait_til_done(floppy_ready, interruptible);
 }
 
 /*
  * User triggered reset
  * ====================
  */
 
 static void reset_intr(void)
 {
     pr_info("weird, reset interrupt called\n");
 }
 
 static const struct cont_t reset_cont = {
     .interrupt  = reset_intr,
     .redo       = success_and_wakeup,
     .error      = generic_failure,
     .done       = generic_done
 };
 
 /*
  * Resets the FDC connected to drive <drive>.
  * Both current_drive and current_fdc are changed to match the new drive.
  */
 static int user_reset_fdc(int drive, int arg, bool interruptible)
 {
     int ret;
 
     if (lock_fdc(drive))
         return -EINTR;
 
     if (arg == FD_RESET_ALWAYS)
         fdc_state[current_fdc].reset = 1;
     if (fdc_state[current_fdc].reset) {
         /* note: reset_fdc will take care of unlocking the driver
          * on completion.
          */
         cont = &reset_cont;
         ret = wait_til_done(reset_fdc, interruptible);
         if (ret == -EINTR)
             return -EINTR;
     }
     process_fd_request();
     return 0;
 }
 
 /*
  * Misc Ioctl's and support
  * ========================
  */
 static inline int fd_copyout(void __user *param, const void *address,
                  unsigned long size)
 {
     return copy_to_user(param, address, size) ? -EFAULT : 0;
 }
 
 static inline int fd_copyin(void __user *param, void *address,
                 unsigned long size)
 {
     return copy_from_user(address, param, size) ? -EFAULT : 0;
 }
 
 static const char *drive_name(int type, int drive)
 {
     struct floppy_struct *floppy;
 
     if (type)
         floppy = floppy_type + type;
     else {
         if (drive_params[drive].native_format)
             floppy = floppy_type + drive_params[drive].native_format;
         else
             return "(null)";
     }
     if (floppy->name)
         return floppy->name;
     else
         return "(null)";
 }
 
 #ifdef CONFIG_BLK_DEV_FD_RAWCMD
 
 /* raw commands */
 static void raw_cmd_done(int flag)
 {
     if (!flag) {
         raw_cmd->flags |= FD_RAW_FAILURE;
         raw_cmd->flags |= FD_RAW_HARDFAILURE;
     } else {
         raw_cmd->reply_count = inr;
         if (raw_cmd->reply_count > FD_RAW_REPLY_SIZE)
             raw_cmd->reply_count = 0;
         memcpy(raw_cmd->reply, reply_buffer, raw_cmd->reply_count);
 
         if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
             unsigned long flags;
             flags = claim_dma_lock();
             raw_cmd->length = fd_get_dma_residue();
             release_dma_lock(flags);
         }
 
         if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
             (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
             raw_cmd->flags |= FD_RAW_FAILURE;
 
         if (disk_change(current_drive))
             raw_cmd->flags |= FD_RAW_DISK_CHANGE;
         else
             raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
         if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
             motor_off_callback(&motor_off_timer[current_drive]);
 
         if (raw_cmd->next &&
             (!(raw_cmd->flags & FD_RAW_FAILURE) ||
              !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
             ((raw_cmd->flags & FD_RAW_FAILURE) ||
              !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
             raw_cmd = raw_cmd->next;
             return;
         }
     }
     generic_done(flag);
 }
 
 static const struct cont_t raw_cmd_cont = {
     .interrupt  = success_and_wakeup,
     .redo       = floppy_start,
     .error      = generic_failure,
     .done       = raw_cmd_done
 };
 
 static int raw_cmd_copyout(int cmd, void __user *param,
                   struct floppy_raw_cmd *ptr)
 {
     int ret;
 
     while (ptr) {
         struct floppy_raw_cmd cmd = *ptr;
         cmd.next = NULL;
         cmd.kernel_data = NULL;
         ret = copy_to_user(param, &cmd, sizeof(cmd));
         if (ret)
             return -EFAULT;
         param += sizeof(struct floppy_raw_cmd);
         if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
             if (ptr->length >= 0 &&
                 ptr->length <= ptr->buffer_length) {
                 long length = ptr->buffer_length - ptr->length;
                 ret = fd_copyout(ptr->data, ptr->kernel_data,
                          length);
                 if (ret)
                     return ret;
             }
         }
         ptr = ptr->next;
     }
 
     return 0;
 }
 
 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
 {
     struct floppy_raw_cmd *next;
     struct floppy_raw_cmd *this;
 
     this = *ptr;
     *ptr = NULL;
     while (this) {
         if (this->buffer_length) {
             fd_dma_mem_free((unsigned long)this->kernel_data,
                     this->buffer_length);
             this->buffer_length = 0;
         }
         next = this->next;
         kfree(this);
         this = next;
     }
 }
 
 #define MAX_LEN (1UL << MAX_ORDER << PAGE_SHIFT)
 
 static int raw_cmd_copyin(int cmd, void __user *param,
                  struct floppy_raw_cmd **rcmd)
 {
     struct floppy_raw_cmd *ptr;
     int ret;
 
     *rcmd = NULL;
 
 loop:
     ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_KERNEL);
     if (!ptr)
         return -ENOMEM;
     *rcmd = ptr;
     ret = copy_from_user(ptr, param, sizeof(*ptr));
     ptr->next = NULL;
     ptr->buffer_length = 0;
     ptr->kernel_data = NULL;
     if (ret)
         return -EFAULT;
     param += sizeof(struct floppy_raw_cmd);
     if (ptr->cmd_count > FD_RAW_CMD_FULLSIZE)
         return -EINVAL;
 
     memset(ptr->reply, 0, FD_RAW_REPLY_SIZE);
     ptr->resultcode = 0;
 
     if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
         if (ptr->length <= 0 || ptr->length >= MAX_LEN)
             return -EINVAL;
         ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length);
         fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
         if (!ptr->kernel_data)
             return -ENOMEM;
         ptr->buffer_length = ptr->length;
     }
     if (ptr->flags & FD_RAW_WRITE) {
         ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
         if (ret)
             return ret;
     }
 
     if (ptr->flags & FD_RAW_MORE) {
         rcmd = &(ptr->next);
         ptr->rate &= 0x43;
         goto loop;
     }
 
     return 0;
 }
 
 static int raw_cmd_ioctl(int cmd, void __user *param)
 {
     struct floppy_raw_cmd *my_raw_cmd;
     int drive;
     int ret2;
     int ret;
 
     if (fdc_state[current_fdc].rawcmd <= 1)
         fdc_state[current_fdc].rawcmd = 1;
     for (drive = 0; drive < N_DRIVE; drive++) {
         if (FDC(drive) != current_fdc)
             continue;
         if (drive == current_drive) {
             if (drive_state[drive].fd_ref > 1) {
                 fdc_state[current_fdc].rawcmd = 2;
                 break;
             }
         } else if (drive_state[drive].fd_ref) {
             fdc_state[current_fdc].rawcmd = 2;
             break;
         }
     }
 
     if (fdc_state[current_fdc].reset)
         return -EIO;
 
     ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
     if (ret) {
         raw_cmd_free(&my_raw_cmd);
         return ret;
     }
 
     raw_cmd = my_raw_cmd;
     cont = &raw_cmd_cont;
     ret = wait_til_done(floppy_start, true);
     debug_dcl(drive_params[current_drive].flags,
           "calling disk change from raw_cmd ioctl\n");
 
     if (ret != -EINTR && fdc_state[current_fdc].reset)
         ret = -EIO;
 
     drive_state[current_drive].track = NO_TRACK;
 
     ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
     if (!ret)
         ret = ret2;
     raw_cmd_free(&my_raw_cmd);
     return ret;
 }
 
 static int floppy_raw_cmd_ioctl(int type, int drive, int cmd,
                 void __user *param)
 {
     int ret;
 
     pr_warn_once("Note: FDRAWCMD is deprecated and will be removed from the kernel in the near future.\n");
 
     if (type)
         return -EINVAL;
     if (lock_fdc(drive))
         return -EINTR;
     set_floppy(drive);
     ret = raw_cmd_ioctl(cmd, param);
     if (ret == -EINTR)
         return -EINTR;
     process_fd_request();
     return ret;
 }
 
 #else /* CONFIG_BLK_DEV_FD_RAWCMD */
 
 static int floppy_raw_cmd_ioctl(int type, int drive, int cmd,
                 void __user *param)
 {
     return -EOPNOTSUPP;
 }
 
 #endif
 
 static int invalidate_drive(struct block_device *bdev)
 {
     /* invalidate the buffer track to force a reread */
     set_bit((long)bdev->bd_disk->private_data, &fake_change);
     process_fd_request();
     if (bdev_check_media_change(bdev))
         floppy_revalidate(bdev->bd_disk);
     return 0;
 }
 
 static int set_geometry(unsigned int cmd, struct floppy_struct *g,
                    int drive, int type, struct block_device *bdev)
 {
     int cnt;
 
     /* sanity checking for parameters. */
     if ((int)g->sect <= 0 ||
         (int)g->head <= 0 ||
         /* check for overflow in max_sector */
         (int)(g->sect * g->head) <= 0 ||
         /* check for zero in raw_cmd->cmd[F_SECT_PER_TRACK] */
         (unsigned char)((g->sect << 2) >> FD_SIZECODE(g)) == 0 ||
         g->track <= 0 || g->track > drive_params[drive].tracks >> STRETCH(g) ||
         /* check if reserved bits are set */
         (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
         return -EINVAL;
     if (type) {
         if (!capable(CAP_SYS_ADMIN))
             return -EPERM;
         mutex_lock(&open_lock);
         if (lock_fdc(drive)) {
             mutex_unlock(&open_lock);
             return -EINTR;
         }
         floppy_type[type] = *g;
         floppy_type[type].name = "user format";
         for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
             floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
                 floppy_type[type].size + 1;
         process_fd_request();
         for (cnt = 0; cnt < N_DRIVE; cnt++) {
             struct block_device *bdev = opened_bdev[cnt];
             if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
                 continue;
             __invalidate_device(bdev, true);
         }
         mutex_unlock(&open_lock);
     } else {
         int oldStretch;
 
         if (lock_fdc(drive))
             return -EINTR;
         if (cmd != FDDEFPRM) {
             /* notice a disk change immediately, else
              * we lose our settings immediately*/
             if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
                 return -EINTR;
         }
         oldStretch = g->stretch;
         user_params[drive] = *g;
         if (buffer_drive == drive)
             SUPBOUND(buffer_max, user_params[drive].sect);
         current_type[drive] = &user_params[drive];
         floppy_sizes[drive] = user_params[drive].size;
         if (cmd == FDDEFPRM)
             drive_state[current_drive].keep_data = -1;
         else
             drive_state[current_drive].keep_data = 1;
         /* invalidation. Invalidate only when needed, i.e.
          * when there are already sectors in the buffer cache
          * whose number will change. This is useful, because
          * mtools often changes the geometry of the disk after
          * looking at the boot block */
         if (drive_state[current_drive].maxblock > user_params[drive].sect ||
             drive_state[current_drive].maxtrack ||
             ((user_params[drive].sect ^ oldStretch) &
              (FD_SWAPSIDES | FD_SECTBASEMASK)))
             invalidate_drive(bdev);
         else
             process_fd_request();
     }
     return 0;
 }
 
 /* handle obsolete ioctl's */
 static unsigned int ioctl_table[] = {
     FDCLRPRM,
     FDSETPRM,
     FDDEFPRM,
     FDGETPRM,
     FDMSGON,
     FDMSGOFF,
     FDFMTBEG,
     FDFMTTRK,
     FDFMTEND,
     FDSETEMSGTRESH,
     FDFLUSH,
     FDSETMAXERRS,
     FDGETMAXERRS,
     FDGETDRVTYP,
     FDSETDRVPRM,
     FDGETDRVPRM,
     FDGETDRVSTAT,
     FDPOLLDRVSTAT,
     FDRESET,
     FDGETFDCSTAT,
     FDWERRORCLR,
     FDWERRORGET,
     FDRAWCMD,
     FDEJECT,
     FDTWADDLE
 };
 
 static int normalize_ioctl(unsigned int *cmd, int *size)
 {
     int i;
 
     for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
         if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
             *size = _IOC_SIZE(*cmd);
             *cmd = ioctl_table[i];
             if (*size > _IOC_SIZE(*cmd)) {
                 pr_info("ioctl not yet supported\n");
                 return -EFAULT;
             }
             return 0;
         }
     }
     return -EINVAL;
 }
 
 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
 {
     if (type)
         *g = &floppy_type[type];
     else {
         if (lock_fdc(drive))
             return -EINTR;
         if (poll_drive(false, 0) == -EINTR)
             return -EINTR;
         process_fd_request();
         *g = current_type[drive];
     }
     if (!*g)
         return -ENODEV;
     return 0;
 }
 
 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 {
     int drive = (long)bdev->bd_disk->private_data;
     int type = ITYPE(drive_state[drive].fd_device);
     struct floppy_struct *g;
     int ret;
 
     ret = get_floppy_geometry(drive, type, &g);
     if (ret)
         return ret;
 
     geo->heads = g->head;
     geo->sectors = g->sect;
     geo->cylinders = g->track;
     return 0;
 }
 
 static bool valid_floppy_drive_params(const short autodetect[FD_AUTODETECT_SIZE],
         int native_format)
 {
     size_t floppy_type_size = ARRAY_SIZE(floppy_type);
     size_t i = 0;
 
     for (i = 0; i < FD_AUTODETECT_SIZE; ++i) {
         if (autodetect[i] < 0 ||
             autodetect[i] >= floppy_type_size)
             return false;
     }
 
     if (native_format < 0 || native_format >= floppy_type_size)
         return false;
 
     return true;
 }
 
 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
             unsigned long param)
 {
     int drive = (long)bdev->bd_disk->private_data;
     int type = ITYPE(drive_state[drive].fd_device);
     int ret;
     int size;
     union inparam {
         struct floppy_struct g; /* geometry */
         struct format_descr f;
         struct floppy_max_errors max_errors;
         struct floppy_drive_params dp;
     } inparam;      /* parameters coming from user space */
     const void *outparam;   /* parameters passed back to user space */
 
     /* convert compatibility eject ioctls into floppy eject ioctl.
      * We do this in order to provide a means to eject floppy disks before
      * installing the new fdutils package */
     if (cmd == CDROMEJECT ||    /* CD-ROM eject */
         cmd == 0x6470) {        /* SunOS floppy eject */
         DPRINT("obsolete eject ioctl\n");
         DPRINT("please use floppycontrol --eject\n");
         cmd = FDEJECT;
     }
 
     if (!((cmd & 0xff00) == 0x0200))
         return -EINVAL;
 
     /* convert the old style command into a new style command */
     ret = normalize_ioctl(&cmd, &size);
     if (ret)
         return ret;
 
     /* permission checks */
     if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) ||
         ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
         return -EPERM;
 
     if (WARN_ON(size < 0 || size > sizeof(inparam)))
         return -EINVAL;
 
     /* copyin */
     memset(&inparam, 0, sizeof(inparam));
     if (_IOC_DIR(cmd) & _IOC_WRITE) {
         ret = fd_copyin((void __user *)param, &inparam, size);
         if (ret)
             return ret;
     }
 
     switch (cmd) {
     case FDEJECT:
         if (drive_state[drive].fd_ref != 1)
             /* somebody else has this drive open */
             return -EBUSY;
         if (lock_fdc(drive))
             return -EINTR;
 
         /* do the actual eject. Fails on
          * non-Sparc architectures */
         ret = fd_eject(UNIT(drive));
 
         set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags);
         set_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
         process_fd_request();
         return ret;
     case FDCLRPRM:
         if (lock_fdc(drive))
             return -EINTR;
         current_type[drive] = NULL;
         floppy_sizes[drive] = MAX_DISK_SIZE << 1;
         drive_state[drive].keep_data = 0;
         return invalidate_drive(bdev);
     case FDSETPRM:
     case FDDEFPRM:
         return set_geometry(cmd, &inparam.g, drive, type, bdev);
     case FDGETPRM:
         ret = get_floppy_geometry(drive, type,
                       (struct floppy_struct **)&outparam);
         if (ret)
             return ret;
         memcpy(&inparam.g, outparam,
                 offsetof(struct floppy_struct, name));
         outparam = &inparam.g;
         break;
     case FDMSGON:
         drive_params[drive].flags |= FTD_MSG;
         return 0;
     case FDMSGOFF:
         drive_params[drive].flags &= ~FTD_MSG;
         return 0;
     case FDFMTBEG:
         if (lock_fdc(drive))
             return -EINTR;
         if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
             return -EINTR;
         ret = drive_state[drive].flags;
         process_fd_request();
         if (ret & FD_VERIFY)
             return -ENODEV;
         if (!(ret & FD_DISK_WRITABLE))
             return -EROFS;
         return 0;
     case FDFMTTRK:
         if (drive_state[drive].fd_ref != 1)
             return -EBUSY;
         return do_format(drive, &inparam.f);
     case FDFMTEND:
     case FDFLUSH:
         if (lock_fdc(drive))
             return -EINTR;
         return invalidate_drive(bdev);
     case FDSETEMSGTRESH:
         drive_params[drive].max_errors.reporting = (unsigned short)(param & 0x0f);
         return 0;
     case FDGETMAXERRS:
         outparam = &drive_params[drive].max_errors;
         break;
     case FDSETMAXERRS:
         drive_params[drive].max_errors = inparam.max_errors;
         break;
     case FDGETDRVTYP:
         outparam = drive_name(type, drive);
         SUPBOUND(size, strlen((const char *)outparam) + 1);
         break;
     case FDSETDRVPRM:
         if (!valid_floppy_drive_params(inparam.dp.autodetect,
                 inparam.dp.native_format))
             return -EINVAL;
         drive_params[drive] = inparam.dp;
         break;
     case FDGETDRVPRM:
         outparam = &drive_params[drive];
         break;
     case FDPOLLDRVSTAT:
         if (lock_fdc(drive))
             return -EINTR;
         if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
             return -EINTR;
         process_fd_request();
         fallthrough;
     case FDGETDRVSTAT:
         outparam = &drive_state[drive];
         break;
     case FDRESET:
         return user_reset_fdc(drive, (int)param, true);
     case FDGETFDCSTAT:
         outparam = &fdc_state[FDC(drive)];
         break;
     case FDWERRORCLR:
         memset(&write_errors[drive], 0, sizeof(write_errors[drive]));
         return 0;
     case FDWERRORGET:
         outparam = &write_errors[drive];
         break;
     case FDRAWCMD:
         return floppy_raw_cmd_ioctl(type, drive, cmd, (void __user *)param);
     case FDTWADDLE:
         if (lock_fdc(drive))
             return -EINTR;
         twaddle(current_fdc, current_drive);
         process_fd_request();
         return 0;
     default:
         return -EINVAL;
     }
 
     if (_IOC_DIR(cmd) & _IOC_READ)
         return fd_copyout((void __user *)param, outparam, size);
 
     return 0;
 }
 
 static int fd_ioctl(struct block_device *bdev, fmode_t mode,
                  unsigned int cmd, unsigned long param)
 {
     int ret;
 
     mutex_lock(&floppy_mutex);
     ret = fd_locked_ioctl(bdev, mode, cmd, param);
     mutex_unlock(&floppy_mutex);
 
     return ret;
 }
 
 #ifdef CONFIG_COMPAT
 
 struct compat_floppy_drive_params {
     char        cmos;
     compat_ulong_t  max_dtr;
     compat_ulong_t  hlt;
     compat_ulong_t  hut;
     compat_ulong_t  srt;
     compat_ulong_t  spinup;
     compat_ulong_t  spindown;
     unsigned char   spindown_offset;
     unsigned char   select_delay;
     unsigned char   rps;
     unsigned char   tracks;
     compat_ulong_t  timeout;
     unsigned char   interleave_sect;
     struct floppy_max_errors max_errors;
     char        flags;
     char        read_track;
     short       autodetect[FD_AUTODETECT_SIZE];
     compat_int_t    checkfreq;
     compat_int_t    native_format;
 };
 
 struct compat_floppy_drive_struct {
     signed char flags;
     compat_ulong_t  spinup_date;
     compat_ulong_t  select_date;
     compat_ulong_t  first_read_date;
     short       probed_format;
     short       track;
     short       maxblock;
     short       maxtrack;
     compat_int_t    generation;
     compat_int_t    keep_data;
     compat_int_t    fd_ref;
     compat_int_t    fd_device;
     compat_int_t    last_checked;
     compat_caddr_t dmabuf;
     compat_int_t    bufblocks;
 };
 
 struct compat_floppy_fdc_state {
     compat_int_t    spec1;
     compat_int_t    spec2;
     compat_int_t    dtr;
     unsigned char   version;
     unsigned char   dor;
     compat_ulong_t  address;
     unsigned int    rawcmd:2;
     unsigned int    reset:1;
     unsigned int    need_configure:1;
     unsigned int    perp_mode:2;
     unsigned int    has_fifo:1;
     unsigned int    driver_version;
     unsigned char   track[4];
 };
 
 struct compat_floppy_write_errors {
     unsigned int    write_errors;
     compat_ulong_t  first_error_sector;
     compat_int_t    first_error_generation;
     compat_ulong_t  last_error_sector;
     compat_int_t    last_error_generation;
     compat_uint_t   badness;
 };
 
 #define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
 #define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
 #define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
 #define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
 #define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
 #define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
 #define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
 #define FDWERRORGET32  _IOR(2, 0x17, struct compat_floppy_write_errors)
 
 static int compat_set_geometry(struct block_device *bdev, fmode_t mode, unsigned int cmd,
             struct compat_floppy_struct __user *arg)
 {
     struct floppy_struct v;
     int drive, type;
     int err;
 
     BUILD_BUG_ON(offsetof(struct floppy_struct, name) !=
              offsetof(struct compat_floppy_struct, name));
 
     if (!(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL)))
         return -EPERM;
 
     memset(&v, 0, sizeof(struct floppy_struct));
     if (copy_from_user(&v, arg, offsetof(struct floppy_struct, name)))
         return -EFAULT;
 
     mutex_lock(&floppy_mutex);
     drive = (long)bdev->bd_disk->private_data;
     type = ITYPE(drive_state[drive].fd_device);
     err = set_geometry(cmd == FDSETPRM32 ? FDSETPRM : FDDEFPRM,
             &v, drive, type, bdev);
     mutex_unlock(&floppy_mutex);
     return err;
 }
 
 static int compat_get_prm(int drive,
               struct compat_floppy_struct __user *arg)
 {
     struct compat_floppy_struct v;
     struct floppy_struct *p;
     int err;
 
     memset(&v, 0, sizeof(v));
     mutex_lock(&floppy_mutex);
     err = get_floppy_geometry(drive, ITYPE(drive_state[drive].fd_device),
                   &p);
     if (err) {
         mutex_unlock(&floppy_mutex);
         return err;
     }
     memcpy(&v, p, offsetof(struct floppy_struct, name));
     mutex_unlock(&floppy_mutex);
     if (copy_to_user(arg, &v, sizeof(struct compat_floppy_struct)))
         return -EFAULT;
     return 0;
 }
 
 static int compat_setdrvprm(int drive,
                 struct compat_floppy_drive_params __user *arg)
 {
     struct compat_floppy_drive_params v;
 
     if (!capable(CAP_SYS_ADMIN))
         return -EPERM;
     if (copy_from_user(&v, arg, sizeof(struct compat_floppy_drive_params)))
         return -EFAULT;
     if (!valid_floppy_drive_params(v.autodetect, v.native_format))
         return -EINVAL;
     mutex_lock(&floppy_mutex);
     drive_params[drive].cmos = v.cmos;
     drive_params[drive].max_dtr = v.max_dtr;
     drive_params[drive].hlt = v.hlt;
     drive_params[drive].hut = v.hut;
     drive_params[drive].srt = v.srt;
     drive_params[drive].spinup = v.spinup;
     drive_params[drive].spindown = v.spindown;
     drive_params[drive].spindown_offset = v.spindown_offset;
     drive_params[drive].select_delay = v.select_delay;
     drive_params[drive].rps = v.rps;
     drive_params[drive].tracks = v.tracks;
     drive_params[drive].timeout = v.timeout;
     drive_params[drive].interleave_sect = v.interleave_sect;
     drive_params[drive].max_errors = v.max_errors;
     drive_params[drive].flags = v.flags;
     drive_params[drive].read_track = v.read_track;
     memcpy(drive_params[drive].autodetect, v.autodetect,
            sizeof(v.autodetect));
     drive_params[drive].checkfreq = v.checkfreq;
     drive_params[drive].native_format = v.native_format;
     mutex_unlock(&floppy_mutex);
     return 0;
 }
 
 static int compat_getdrvprm(int drive,
                 struct compat_floppy_drive_params __user *arg)
 {
     struct compat_floppy_drive_params v;
 
     memset(&v, 0, sizeof(struct compat_floppy_drive_params));
     mutex_lock(&floppy_mutex);
     v.cmos = drive_params[drive].cmos;
     v.max_dtr = drive_params[drive].max_dtr;
     v.hlt = drive_params[drive].hlt;
     v.hut = drive_params[drive].hut;
     v.srt = drive_params[drive].srt;
     v.spinup = drive_params[drive].spinup;
     v.spindown = drive_params[drive].spindown;
     v.spindown_offset = drive_params[drive].spindown_offset;
     v.select_delay = drive_params[drive].select_delay;
     v.rps = drive_params[drive].rps;
     v.tracks = drive_params[drive].tracks;
     v.timeout = drive_params[drive].timeout;
     v.interleave_sect = drive_params[drive].interleave_sect;
     v.max_errors = drive_params[drive].max_errors;
     v.flags = drive_params[drive].flags;
     v.read_track = drive_params[drive].read_track;
     memcpy(v.autodetect, drive_params[drive].autodetect,
            sizeof(v.autodetect));
     v.checkfreq = drive_params[drive].checkfreq;
     v.native_format = drive_params[drive].native_format;
     mutex_unlock(&floppy_mutex);
 
     if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_params)))
         return -EFAULT;
     return 0;
 }
 
 static int compat_getdrvstat(int drive, bool poll,
                 struct compat_floppy_drive_struct __user *arg)
 {
     struct compat_floppy_drive_struct v;
 
     memset(&v, 0, sizeof(struct compat_floppy_drive_struct));
     mutex_lock(&floppy_mutex);
 
     if (poll) {
         if (lock_fdc(drive))
             goto Eintr;
         if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
             goto Eintr;
         process_fd_request();
     }
     v.spinup_date = drive_state[drive].spinup_date;
     v.select_date = drive_state[drive].select_date;
     v.first_read_date = drive_state[drive].first_read_date;
     v.probed_format = drive_state[drive].probed_format;
     v.track = drive_state[drive].track;
     v.maxblock = drive_state[drive].maxblock;
     v.maxtrack = drive_state[drive].maxtrack;
     v.generation = drive_state[drive].generation;
     v.keep_data = drive_state[drive].keep_data;
     v.fd_ref = drive_state[drive].fd_ref;
     v.fd_device = drive_state[drive].fd_device;
     v.last_checked = drive_state[drive].last_checked;
     v.dmabuf = (uintptr_t) drive_state[drive].dmabuf;
     v.bufblocks = drive_state[drive].bufblocks;
     mutex_unlock(&floppy_mutex);
 
     if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_struct)))
         return -EFAULT;
     return 0;
 Eintr:
     mutex_unlock(&floppy_mutex);
     return -EINTR;
 }
 
 static int compat_getfdcstat(int drive,
                 struct compat_floppy_fdc_state __user *arg)
 {
     struct compat_floppy_fdc_state v32;
     struct floppy_fdc_state v;
 
     mutex_lock(&floppy_mutex);
     v = fdc_state[FDC(drive)];
     mutex_unlock(&floppy_mutex);
 
     memset(&v32, 0, sizeof(struct compat_floppy_fdc_state));
     v32.spec1 = v.spec1;
     v32.spec2 = v.spec2;
     v32.dtr = v.dtr;
     v32.version = v.version;
     v32.dor = v.dor;
     v32.address = v.address;
     v32.rawcmd = v.rawcmd;
     v32.reset = v.reset;
     v32.need_configure = v.need_configure;
     v32.perp_mode = v.perp_mode;
     v32.has_fifo = v.has_fifo;
     v32.driver_version = v.driver_version;
     memcpy(v32.track, v.track, 4);
     if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_fdc_state)))
         return -EFAULT;
     return 0;
 }
 
 static int compat_werrorget(int drive,
                 struct compat_floppy_write_errors __user *arg)
 {
     struct compat_floppy_write_errors v32;
     struct floppy_write_errors v;
 
     memset(&v32, 0, sizeof(struct compat_floppy_write_errors));
     mutex_lock(&floppy_mutex);
     v = write_errors[drive];
     mutex_unlock(&floppy_mutex);
     v32.write_errors = v.write_errors;
     v32.first_error_sector = v.first_error_sector;
     v32.first_error_generation = v.first_error_generation;
     v32.last_error_sector = v.last_error_sector;
     v32.last_error_generation = v.last_error_generation;
     v32.badness = v.badness;
     if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_write_errors)))
         return -EFAULT;
     return 0;
 }
 
 static int fd_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
             unsigned long param)
 {
     int drive = (long)bdev->bd_disk->private_data;
     switch (cmd) {
     case CDROMEJECT: /* CD-ROM eject */
     case 0x6470:     /* SunOS floppy eject */
 
     case FDMSGON:
     case FDMSGOFF:
     case FDSETEMSGTRESH:
     case FDFLUSH:
     case FDWERRORCLR:
     case FDEJECT:
     case FDCLRPRM:
     case FDFMTBEG:
     case FDRESET:
     case FDTWADDLE:
         return fd_ioctl(bdev, mode, cmd, param);
     case FDSETMAXERRS:
     case FDGETMAXERRS:
     case FDGETDRVTYP:
     case FDFMTEND:
     case FDFMTTRK:
     case FDRAWCMD:
         return fd_ioctl(bdev, mode, cmd,
                 (unsigned long)compat_ptr(param));
     case FDSETPRM32:
     case FDDEFPRM32:
         return compat_set_geometry(bdev, mode, cmd, compat_ptr(param));
     case FDGETPRM32:
         return compat_get_prm(drive, compat_ptr(param));
     case FDSETDRVPRM32:
         return compat_setdrvprm(drive, compat_ptr(param));
     case FDGETDRVPRM32:
         return compat_getdrvprm(drive, compat_ptr(param));
     case FDPOLLDRVSTAT32:
         return compat_getdrvstat(drive, true, compat_ptr(param));
     case FDGETDRVSTAT32:
         return compat_getdrvstat(drive, false, compat_ptr(param));
     case FDGETFDCSTAT32:
         return compat_getfdcstat(drive, compat_ptr(param));
     case FDWERRORGET32:
         return compat_werrorget(drive, compat_ptr(param));
     }
     return -EINVAL;
 }
 #endif
 
 static void __init config_types(void)
 {
     bool has_drive = false;
     int drive;
 
     /* read drive info out of physical CMOS */
     drive = 0;
     if (!drive_params[drive].cmos)
         drive_params[drive].cmos = FLOPPY0_TYPE;
     drive = 1;
     if (!drive_params[drive].cmos)
         drive_params[drive].cmos = FLOPPY1_TYPE;
 
     /* FIXME: additional physical CMOS drive detection should go here */
 
     for (drive = 0; drive < N_DRIVE; drive++) {
         unsigned int type = drive_params[drive].cmos;
         struct floppy_drive_params *params;
         const char *name = NULL;
         char temparea[32];
 
         if (type < ARRAY_SIZE(default_drive_params)) {
             params = &default_drive_params[type].params;
             if (type) {
                 name = default_drive_params[type].name;
                 allowed_drive_mask |= 1 << drive;
             } else
                 allowed_drive_mask &= ~(1 << drive);
         } else {
             params = &default_drive_params[0].params;
             snprintf(temparea, sizeof(temparea),
                  "unknown type %d (usb?)", type);
             name = temparea;
         }
         if (name) {
             const char *prepend;
             if (!has_drive) {
                 prepend = "";
                 has_drive = true;
                 pr_info("Floppy drive(s):");
             } else {
                 prepend = ",";
             }
 
             pr_cont("%s fd%d is %s", prepend, drive, name);
         }
         drive_params[drive] = *params;
     }
 
     if (has_drive)
         pr_cont("\n");
 }
 
 static void floppy_release(struct gendisk *disk, fmode_t mode)
 {
     int drive = (long)disk->private_data;
 
     mutex_lock(&floppy_mutex);
     mutex_lock(&open_lock);
     if (!drive_state[drive].fd_ref--) {
         DPRINT("floppy_release with fd_ref == 0");
         drive_state[drive].fd_ref = 0;
     }
     if (!drive_state[drive].fd_ref)
         opened_bdev[drive] = NULL;
     mutex_unlock(&open_lock);
     mutex_unlock(&floppy_mutex);
 }
 
 /*
  * floppy_open check for aliasing (/dev/fd0 can be the same as
  * /dev/PS0 etc), and disallows simultaneous access to the same
  * drive with different device numbers.
  */
 static int floppy_open(struct block_device *bdev, fmode_t mode)
 {
     int drive = (long)bdev->bd_disk->private_data;
     int old_dev, new_dev;
     int try;
     int res = -EBUSY;
     char *tmp;
 
     mutex_lock(&floppy_mutex);
     mutex_lock(&open_lock);
     old_dev = drive_state[drive].fd_device;
     if (opened_bdev[drive] && opened_bdev[drive] != bdev)
         goto out2;
 
     if (!drive_state[drive].fd_ref && (drive_params[drive].flags & FD_BROKEN_DCL)) {
         set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags);
         set_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
     }
 
     drive_state[drive].fd_ref++;
 
     opened_bdev[drive] = bdev;
 
     res = -ENXIO;
 
     if (!floppy_track_buffer) {
         /* if opening an ED drive, reserve a big buffer,
          * else reserve a small one */
         if ((drive_params[drive].cmos == 6) || (drive_params[drive].cmos == 5))
             try = 64;   /* Only 48 actually useful */
         else
             try = 32;   /* Only 24 actually useful */
 
         tmp = (char *)fd_dma_mem_alloc(1024 * try);
         if (!tmp && !floppy_track_buffer) {
             try >>= 1;  /* buffer only one side */
             INFBOUND(try, 16);
             tmp = (char *)fd_dma_mem_alloc(1024 * try);
         }
         if (!tmp && !floppy_track_buffer)
             fallback_on_nodma_alloc(&tmp, 2048 * try);
         if (!tmp && !floppy_track_buffer) {
             DPRINT("Unable to allocate DMA memory\n");
             goto out;
         }
         if (floppy_track_buffer) {
             if (tmp)
                 fd_dma_mem_free((unsigned long)tmp, try * 1024);
         } else {
             buffer_min = buffer_max = -1;
             floppy_track_buffer = tmp;
             max_buffer_sectors = try;
         }
     }
 
     new_dev = MINOR(bdev->bd_dev);
     drive_state[drive].fd_device = new_dev;
     set_capacity(disks[drive][ITYPE(new_dev)], floppy_sizes[new_dev]);
     if (old_dev != -1 && old_dev != new_dev) {
         if (buffer_drive == drive)
             buffer_track = -1;
     }
 
     if (fdc_state[FDC(drive)].rawcmd == 1)
         fdc_state[FDC(drive)].rawcmd = 2;
 
     if (!(mode & FMODE_NDELAY)) {
         if (mode & (FMODE_READ|FMODE_WRITE)) {
             drive_state[drive].last_checked = 0;
             clear_bit(FD_OPEN_SHOULD_FAIL_BIT,
                   &drive_state[drive].flags);
             if (bdev_check_media_change(bdev))
                 floppy_revalidate(bdev->bd_disk);
             if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags))
                 goto out;
             if (test_bit(FD_OPEN_SHOULD_FAIL_BIT, &drive_state[drive].flags))
                 goto out;
         }
         res = -EROFS;
         if ((mode & FMODE_WRITE) &&
             !test_bit(FD_DISK_WRITABLE_BIT, &drive_state[drive].flags))
             goto out;
     }
     mutex_unlock(&open_lock);
     mutex_unlock(&floppy_mutex);
     return 0;
 out:
     drive_state[drive].fd_ref--;
 
     if (!drive_state[drive].fd_ref)
         opened_bdev[drive] = NULL;
 out2:
     mutex_unlock(&open_lock);
     mutex_unlock(&floppy_mutex);
     return res;
 }
 
 /*
  * Check if the disk has been changed or if a change has been faked.
  */
 static unsigned int floppy_check_events(struct gendisk *disk,
                     unsigned int clearing)
 {
     int drive = (long)disk->private_data;
 
     if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) ||
         test_bit(FD_VERIFY_BIT, &drive_state[drive].flags))
         return DISK_EVENT_MEDIA_CHANGE;
 
     if (time_after(jiffies, drive_state[drive].last_checked + drive_params[drive].checkfreq)) {
         if (lock_fdc(drive))
             return 0;
         poll_drive(false, 0);
         process_fd_request();
     }
 
     if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) ||
         test_bit(FD_VERIFY_BIT, &drive_state[drive].flags) ||
         test_bit(drive, &fake_change) ||
         drive_no_geom(drive))
         return DISK_EVENT_MEDIA_CHANGE;
     return 0;
 }
 
 /*
  * This implements "read block 0" for floppy_revalidate().
  * Needed for format autodetection, checking whether there is
  * a disk in the drive, and whether that disk is writable.
  */
 
 struct rb0_cbdata {
     int drive;
     struct completion complete;
 };
 
 static void floppy_rb0_cb(struct bio *bio)
 {
     struct rb0_cbdata *cbdata = (struct rb0_cbdata *)bio->bi_private;
     int drive = cbdata->drive;
 
     if (bio->bi_status) {
         pr_info("floppy: error %d while reading block 0\n",
             bio->bi_status);
         set_bit(FD_OPEN_SHOULD_FAIL_BIT, &drive_state[drive].flags);
     }
     complete(&cbdata->complete);
 }
 
 static int __floppy_read_block_0(struct block_device *bdev, int drive)
 {
     struct bio bio;
     struct bio_vec bio_vec;
     struct page *page;
     struct rb0_cbdata cbdata;
 
     page = alloc_page(GFP_NOIO);
     if (!page) {
         process_fd_request();
         return -ENOMEM;
     }
 
     cbdata.drive = drive;
 
     bio_init(&bio, bdev, &bio_vec, 1, REQ_OP_READ);
     bio_add_page(&bio, page, block_size(bdev), 0);
 
     bio.bi_iter.bi_sector = 0;
     bio.bi_flags |= (1 << BIO_QUIET);
     bio.bi_private = &cbdata;
     bio.bi_end_io = floppy_rb0_cb;
 
     init_completion(&cbdata.complete);
 
     submit_bio(&bio);
     process_fd_request();
 
     wait_for_completion(&cbdata.complete);
 
     __free_page(page);
 
     return 0;
 }
 
 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
  * the bootblock (block 0). "Autodetection" is also needed to check whether
  * there is a disk in the drive at all... Thus we also do it for fixed
  * geometry formats */
 static int floppy_revalidate(struct gendisk *disk)
 {
     int drive = (long)disk->private_data;
     int cf;
     int res = 0;
 
     if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) ||
         test_bit(FD_VERIFY_BIT, &drive_state[drive].flags) ||
         test_bit(drive, &fake_change) ||
         drive_no_geom(drive)) {
         if (WARN(atomic_read(&usage_count) == 0,
              "VFS: revalidate called on non-open device.\n"))
             return -EFAULT;
 
         res = lock_fdc(drive);
         if (res)
             return res;
         cf = (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) ||
               test_bit(FD_VERIFY_BIT, &drive_state[drive].flags));
         if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) {
             process_fd_request();   /*already done by another thread */
             return 0;
         }
         drive_state[drive].maxblock = 0;
         drive_state[drive].maxtrack = 0;
         if (buffer_drive == drive)
             buffer_track = -1;
         clear_bit(drive, &fake_change);
         clear_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags);
         if (cf)
             drive_state[drive].generation++;
         if (drive_no_geom(drive)) {
             /* auto-sensing */
             res = __floppy_read_block_0(opened_bdev[drive], drive);
         } else {
             if (cf)
                 poll_drive(false, FD_RAW_NEED_DISK);
             process_fd_request();
         }
     }
     set_capacity(disk, floppy_sizes[drive_state[drive].fd_device]);
     return res;
 }
 
 static const struct block_device_operations floppy_fops = {
     .owner          = THIS_MODULE,
     .open           = floppy_open,
     .release        = floppy_release,
     .ioctl          = fd_ioctl,
     .getgeo         = fd_getgeo,
     .check_events       = floppy_check_events,
 #ifdef CONFIG_COMPAT
     .compat_ioctl       = fd_compat_ioctl,
 #endif
 };
 
 /*
  * Floppy Driver initialization
  * =============================
  */
 
 /* Determine the floppy disk controller type */
 /* This routine was written by David C. Niemi */
 static char __init get_fdc_version(int fdc)
 {
     int r;
 
     output_byte(fdc, FD_DUMPREGS);  /* 82072 and better know DUMPREGS */
     if (fdc_state[fdc].reset)
         return FDC_NONE;
     r = result(fdc);
     if (r <= 0x00)
         return FDC_NONE;    /* No FDC present ??? */
     if ((r == 1) && (reply_buffer[ST0] == 0x80)) {
         pr_info("FDC %d is an 8272A\n", fdc);
         return FDC_8272A;   /* 8272a/765 don't know DUMPREGS */
     }
     if (r != 10) {
         pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
             fdc, r);
         return FDC_UNKNOWN;
     }
 
     if (!fdc_configure(fdc)) {
         pr_info("FDC %d is an 82072\n", fdc);
         return FDC_82072;   /* 82072 doesn't know CONFIGURE */
     }
 
     output_byte(fdc, FD_PERPENDICULAR);
     if (need_more_output(fdc) == MORE_OUTPUT) {
         output_byte(fdc, 0);
     } else {
         pr_info("FDC %d is an 82072A\n", fdc);
         return FDC_82072A;  /* 82072A as found on Sparcs. */
     }
 
     output_byte(fdc, FD_UNLOCK);
     r = result(fdc);
     if ((r == 1) && (reply_buffer[ST0] == 0x80)) {
         pr_info("FDC %d is a pre-1991 82077\n", fdc);
         return FDC_82077_ORIG;  /* Pre-1991 82077, doesn't know
                      * LOCK/UNLOCK */
     }
     if ((r != 1) || (reply_buffer[ST0] != 0x00)) {
         pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
             fdc, r);
         return FDC_UNKNOWN;
     }
     output_byte(fdc, FD_PARTID);
     r = result(fdc);
     if (r != 1) {
         pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
             fdc, r);
         return FDC_UNKNOWN;
     }
     if (reply_buffer[ST0] == 0x80) {
         pr_info("FDC %d is a post-1991 82077\n", fdc);
         return FDC_82077;   /* Revised 82077AA passes all the tests */
     }
     switch (reply_buffer[ST0] >> 5) {
     case 0x0:
         /* Either a 82078-1 or a 82078SL running at 5Volt */
         pr_info("FDC %d is an 82078.\n", fdc);
         return FDC_82078;
     case 0x1:
         pr_info("FDC %d is a 44pin 82078\n", fdc);
         return FDC_82078;
     case 0x2:
         pr_info("FDC %d is a S82078B\n", fdc);
         return FDC_S82078B;
     case 0x3:
         pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
         return FDC_87306;
     default:
         pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
             fdc, reply_buffer[ST0] >> 5);
         return FDC_82078_UNKN;
     }
 }               /* get_fdc_version */
 
 /* lilo configuration */
 
 static void __init floppy_set_flags(int *ints, int param, int param2)
 {
     int i;
 
     for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
         if (param)
             default_drive_params[i].params.flags |= param2;
         else
             default_drive_params[i].params.flags &= ~param2;
     }
     DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
 }
 
 static void __init daring(int *ints, int param, int param2)
 {
     int i;
 
     for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
         if (param) {
             default_drive_params[i].params.select_delay = 0;
             default_drive_params[i].params.flags |=
                 FD_SILENT_DCL_CLEAR;
         } else {
             default_drive_params[i].params.select_delay =
                 2 * HZ / 100;
             default_drive_params[i].params.flags &=
                 ~FD_SILENT_DCL_CLEAR;
         }
     }
     DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
 }
 
 static void __init set_cmos(int *ints, int dummy, int dummy2)
 {
     int current_drive = 0;
 
     if (ints[0] != 2) {
         DPRINT("wrong number of parameters for CMOS\n");
         return;
     }
     current_drive = ints[1];
     if (current_drive < 0 || current_drive >= 8) {
         DPRINT("bad drive for set_cmos\n");
         return;
     }
 #if N_FDC > 1
     if (current_drive >= 4 && !FDC2)
         FDC2 = 0x370;
 #endif
     drive_params[current_drive].cmos = ints[2];
     DPRINT("setting CMOS code to %d\n", ints[2]);
 }
 
 static struct param_table {
     const char *name;
     void (*fn) (int *ints, int param, int param2);
     int *var;
     int def_param;
     int param2;
 } config_params[] __initdata = {
     {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
     {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
     {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
     {"irq", NULL, &FLOPPY_IRQ, 6, 0},
     {"dma", NULL, &FLOPPY_DMA, 2, 0},
     {"daring", daring, NULL, 1, 0},
 #if N_FDC > 1
     {"two_fdc", NULL, &FDC2, 0x370, 0},
     {"one_fdc", NULL, &FDC2, 0, 0},
 #endif
     {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
     {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
     {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
     {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
     {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
     {"nodma", NULL, &can_use_virtual_dma, 1, 0},
     {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
     {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
     {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
     {"nofifo", NULL, &no_fifo, 0x20, 0},
     {"usefifo", NULL, &no_fifo, 0, 0},
     {"cmos", set_cmos, NULL, 0, 0},
     {"slow", NULL, &slow_floppy, 1, 0},
     {"unexpected_interrupts", NULL, &print_unex, 1, 0},
     {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
     {"L40SX", NULL, &print_unex, 0, 0}
 
     EXTRA_FLOPPY_PARAMS
 };
 
 static int __init floppy_setup(char *str)
 {
     int i;
     int param;
     int ints[11];
 
     str = get_options(str, ARRAY_SIZE(ints), ints);
     if (str) {
         for (i = 0; i < ARRAY_SIZE(config_params); i++) {
             if (strcmp(str, config_params[i].name) == 0) {
                 if (ints[0])
                     param = ints[1];
                 else
                     param = config_params[i].def_param;
                 if (config_params[i].fn)
                     config_params[i].fn(ints, param,
                                 config_params[i].
                                 param2);
                 if (config_params[i].var) {
                     DPRINT("%s=%d\n", str, param);
                     *config_params[i].var = param;
                 }
                 return 1;
             }
         }
     }
     if (str) {
         DPRINT("unknown floppy option [%s]\n", str);
 
         DPRINT("allowed options are:");
         for (i = 0; i < ARRAY_SIZE(config_params); i++)
             pr_cont(" %s", config_params[i].name);
         pr_cont("\n");
     } else
         DPRINT("botched floppy option\n");
     DPRINT("Read Documentation/admin-guide/blockdev/floppy.rst\n");
     return 0;
 }
 
 static int have_no_fdc = -ENODEV;
 
 static ssize_t floppy_cmos_show(struct device *dev,
                 struct device_attribute *attr, char *buf)
 {
     struct platform_device *p = to_platform_device(dev);
     int drive;
 
     drive = p->id;
     return sprintf(buf, "%X\n", drive_params[drive].cmos);
 }
 
 static DEVICE_ATTR(cmos, 0444, floppy_cmos_show, NULL);
 
 static struct attribute *floppy_dev_attrs[] = {
     &dev_attr_cmos.attr,
     NULL
 };
 
 ATTRIBUTE_GROUPS(floppy_dev);
 
 static void floppy_device_release(struct device *dev)
 {
 }
 
 static int floppy_resume(struct device *dev)
 {
     int fdc;
     int saved_drive;
 
     saved_drive = current_drive;
     for (fdc = 0; fdc < N_FDC; fdc++)
         if (fdc_state[fdc].address != -1)
             user_reset_fdc(REVDRIVE(fdc, 0), FD_RESET_ALWAYS, false);
     set_fdc(saved_drive);
     return 0;
 }
 
 static const struct dev_pm_ops floppy_pm_ops = {
     .resume = floppy_resume,
     .restore = floppy_resume,
 };
 
 static struct platform_driver floppy_driver = {
     .driver = {
            .name = "floppy",
            .pm = &floppy_pm_ops,
     },
 };
 
 static const struct blk_mq_ops floppy_mq_ops = {
     .queue_rq = floppy_queue_rq,
 };
 
 static struct platform_device floppy_device[N_DRIVE];
 static bool registered[N_DRIVE];
 
 static bool floppy_available(int drive)
 {
     if (!(allowed_drive_mask & (1 << drive)))
         return false;
     if (fdc_state[FDC(drive)].version == FDC_NONE)
         return false;
     return true;
 }
 
 static int floppy_alloc_disk(unsigned int drive, unsigned int type)
 {
     struct gendisk *disk;
 
     disk = blk_mq_alloc_disk(&tag_sets[drive], NULL);
     if (IS_ERR(disk))
         return PTR_ERR(disk);
 
     blk_queue_max_hw_sectors(disk->queue, 64);
     disk->major = FLOPPY_MAJOR;
     disk->first_minor = TOMINOR(drive) | (type << 2);
     disk->minors = 1;
     disk->fops = &floppy_fops;
     disk->flags |= GENHD_FL_NO_PART;
     disk->events = DISK_EVENT_MEDIA_CHANGE;
     if (type)
         sprintf(disk->disk_name, "fd%d_type%d", drive, type);
     else
         sprintf(disk->disk_name, "fd%d", drive);
     /* to be cleaned up... */
     disk->private_data = (void *)(long)drive;
     disk->flags |= GENHD_FL_REMOVABLE;
 
     disks[drive][type] = disk;
     return 0;
 }
 
 static DEFINE_MUTEX(floppy_probe_lock);
 
 static void floppy_probe(dev_t dev)
 {
     unsigned int drive = (MINOR(dev) & 3) | ((MINOR(dev) & 0x80) >> 5);
     unsigned int type = (MINOR(dev) >> 2) & 0x1f;
 
     if (drive >= N_DRIVE || !floppy_available(drive) ||
         type >= ARRAY_SIZE(floppy_type))
         return;
 
     mutex_lock(&floppy_probe_lock);
     if (disks[drive][type])
         goto out;
     if (floppy_alloc_disk(drive, type))
         goto out;
     if (add_disk(disks[drive][type]))
         goto cleanup_disk;
 out:
     mutex_unlock(&floppy_probe_lock);
     return;
 
 cleanup_disk:
     put_disk(disks[drive][type]);
     disks[drive][type] = NULL;
     mutex_unlock(&floppy_probe_lock);
 }
 
 static int __init do_floppy_init(void)
 {
     int i, unit, drive, err;
 
     set_debugt();
     interruptjiffies = resultjiffies = jiffies;
 
 #if defined(CONFIG_PPC)
     if (check_legacy_ioport(FDC1))
         return -ENODEV;
 #endif
 
     raw_cmd = NULL;
 
     floppy_wq = alloc_ordered_workqueue("floppy", 0);
     if (!floppy_wq)
         return -ENOMEM;
 
     for (drive = 0; drive < N_DRIVE; drive++) {
         memset(&tag_sets[drive], 0, sizeof(tag_sets[drive]));
         tag_sets[drive].ops = &floppy_mq_ops;
         tag_sets[drive].nr_hw_queues = 1;
         tag_sets[drive].nr_maps = 1;
         tag_sets[drive].queue_depth = 2;
         tag_sets[drive].numa_node = NUMA_NO_NODE;
         tag_sets[drive].flags = BLK_MQ_F_SHOULD_MERGE;
         err = blk_mq_alloc_tag_set(&tag_sets[drive]);
         if (err)
             goto out_put_disk;
 
         err = floppy_alloc_disk(drive, 0);
         if (err)
             goto out_put_disk;
 
         timer_setup(&motor_off_timer[drive], motor_off_callback, 0);
     }
 
     err = __register_blkdev(FLOPPY_MAJOR, "fd", floppy_probe);
     if (err)
         goto out_put_disk;
 
     err = platform_driver_register(&floppy_driver);
     if (err)
         goto out_unreg_blkdev;
 
     for (i = 0; i < 256; i++)
         if (ITYPE(i))
             floppy_sizes[i] = floppy_type[ITYPE(i)].size;
         else
             floppy_sizes[i] = MAX_DISK_SIZE << 1;
 
     reschedule_timeout(MAXTIMEOUT, "floppy init");
     config_types();
 
     for (i = 0; i < N_FDC; i++) {
         memset(&fdc_state[i], 0, sizeof(*fdc_state));
         fdc_state[i].dtr = -1;
         fdc_state[i].dor = 0x4;
 #if defined(__sparc__) || defined(__mc68000__)
     /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
 #ifdef __mc68000__
         if (MACH_IS_SUN3X)
 #endif
             fdc_state[i].version = FDC_82072A;
 #endif
     }
 
     use_virtual_dma = can_use_virtual_dma & 1;
     fdc_state[0].address = FDC1;
     if (fdc_state[0].address == -1) {
         cancel_delayed_work(&fd_timeout);
         err = -ENODEV;
         goto out_unreg_driver;
     }
 #if N_FDC > 1
     fdc_state[1].address = FDC2;
 #endif
 
     current_fdc = 0;    /* reset fdc in case of unexpected interrupt */
     err = floppy_grab_irq_and_dma();
     if (err) {
         cancel_delayed_work(&fd_timeout);
         err = -EBUSY;
         goto out_unreg_driver;
     }
 
     /* initialise drive state */
     for (drive = 0; drive < N_DRIVE; drive++) {
         memset(&drive_state[drive], 0, sizeof(drive_state[drive]));
         memset(&write_errors[drive], 0, sizeof(write_errors[drive]));
         set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[drive].flags);
         set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags);
         set_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
         drive_state[drive].fd_device = -1;
         floppy_track_buffer = NULL;
         max_buffer_sectors = 0;
     }
     /*
      * Small 10 msec delay to let through any interrupt that
      * initialization might have triggered, to not
      * confuse detection:
      */
     msleep(10);
 
     for (i = 0; i < N_FDC; i++) {
         fdc_state[i].driver_version = FD_DRIVER_VERSION;
         for (unit = 0; unit < 4; unit++)
             fdc_state[i].track[unit] = 0;
         if (fdc_state[i].address == -1)
             continue;
         fdc_state[i].rawcmd = 2;
         if (user_reset_fdc(REVDRIVE(i, 0), FD_RESET_ALWAYS, false)) {
             /* free ioports reserved by floppy_grab_irq_and_dma() */
             floppy_release_regions(i);
             fdc_state[i].address = -1;
             fdc_state[i].version = FDC_NONE;
             continue;
         }
         /* Try to determine the floppy controller type */
         fdc_state[i].version = get_fdc_version(i);
         if (fdc_state[i].version == FDC_NONE) {
             /* free ioports reserved by floppy_grab_irq_and_dma() */
             floppy_release_regions(i);
             fdc_state[i].address = -1;
             continue;
         }
         if (can_use_virtual_dma == 2 &&
             fdc_state[i].version < FDC_82072A)
             can_use_virtual_dma = 0;
 
         have_no_fdc = 0;
         /* Not all FDCs seem to be able to handle the version command
          * properly, so force a reset for the standard FDC clones,
          * to avoid interrupt garbage.
          */
         user_reset_fdc(REVDRIVE(i, 0), FD_RESET_ALWAYS, false);
     }
     current_fdc = 0;
     cancel_delayed_work(&fd_timeout);
     current_drive = 0;
     initialized = true;
     if (have_no_fdc) {
         DPRINT("no floppy controllers found\n");
         err = have_no_fdc;
         goto out_release_dma;
     }
 
     for (drive = 0; drive < N_DRIVE; drive++) {
         if (!floppy_available(drive))
             continue;
 
         floppy_device[drive].name = floppy_device_name;
         floppy_device[drive].id = drive;
         floppy_device[drive].dev.release = floppy_device_release;
         floppy_device[drive].dev.groups = floppy_dev_groups;
 
         err = platform_device_register(&floppy_device[drive]);
         if (err)
             goto out_remove_drives;
 
         registered[drive] = true;
 
         err = device_add_disk(&floppy_device[drive].dev,
                       disks[drive][0], NULL);
         if (err)
             goto out_remove_drives;
     }
 
     return 0;
 
 out_remove_drives:
     while (drive--) {
         if (floppy_available(drive)) {
             del_gendisk(disks[drive][0]);
             if (registered[drive])
                 platform_device_unregister(&floppy_device[drive]);
         }
     }
 out_release_dma:
     if (atomic_read(&usage_count))
         floppy_release_irq_and_dma();
 out_unreg_driver:
     platform_driver_unregister(&floppy_driver);
 out_unreg_blkdev:
     unregister_blkdev(FLOPPY_MAJOR, "fd");
 out_put_disk:
     destroy_workqueue(floppy_wq);
     for (drive = 0; drive < N_DRIVE; drive++) {
         if (!disks[drive][0])
             break;
         del_timer_sync(&motor_off_timer[drive]);
         put_disk(disks[drive][0]);
         blk_mq_free_tag_set(&tag_sets[drive]);
     }
     return err;
 }
 
 #ifndef MODULE
 static __init void floppy_async_init(void *data, async_cookie_t cookie)
 {
     do_floppy_init();
 }
 #endif
 
 static int __init floppy_init(void)
 {
 #ifdef MODULE
     return do_floppy_init();
 #else
     /* Don't hold up the bootup by the floppy initialization */
     async_schedule(floppy_async_init, NULL);
     return 0;
 #endif
 }
 
 static const struct io_region {
     int offset;
     int size;
 } io_regions[] = {
     { 2, 1 },
     /* address + 3 is sometimes reserved by pnp bios for motherboard */
     { 4, 2 },
     /* address + 6 is reserved, and may be taken by IDE.
      * Unfortunately, Adaptec doesn't know this :-(, */
     { 7, 1 },
 };
 
 static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
 {
     while (p != io_regions) {
         p--;
         release_region(fdc_state[fdc].address + p->offset, p->size);
     }
 }
 
 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
 
 static int floppy_request_regions(int fdc)
 {
     const struct io_region *p;
 
     for (p = io_regions; p < ARRAY_END(io_regions); p++) {
         if (!request_region(fdc_state[fdc].address + p->offset,
                     p->size, "floppy")) {
             DPRINT("Floppy io-port 0x%04lx in use\n",
                    fdc_state[fdc].address + p->offset);
             floppy_release_allocated_regions(fdc, p);
             return -EBUSY;
         }
     }
     return 0;
 }
 
 static void floppy_release_regions(int fdc)
 {
     floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
 }
 
 static int floppy_grab_irq_and_dma(void)
 {
     int fdc;
 
     if (atomic_inc_return(&usage_count) > 1)
         return 0;
 
     /*
      * We might have scheduled a free_irq(), wait it to
      * drain first:
      */
     flush_workqueue(floppy_wq);
 
     if (fd_request_irq()) {
         DPRINT("Unable to grab IRQ%d for the floppy driver\n",
                FLOPPY_IRQ);
         atomic_dec(&usage_count);
         return -1;
     }
     if (fd_request_dma()) {
         DPRINT("Unable to grab DMA%d for the floppy driver\n",
                FLOPPY_DMA);
         if (can_use_virtual_dma & 2)
             use_virtual_dma = can_use_virtual_dma = 1;
         if (!(can_use_virtual_dma & 1)) {
             fd_free_irq();
             atomic_dec(&usage_count);
             return -1;
         }
     }
 
     for (fdc = 0; fdc < N_FDC; fdc++) {
         if (fdc_state[fdc].address != -1) {
             if (floppy_request_regions(fdc))
                 goto cleanup;
         }
     }
     for (fdc = 0; fdc < N_FDC; fdc++) {
         if (fdc_state[fdc].address != -1) {
             reset_fdc_info(fdc, 1);
             fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR);
         }
     }
 
     set_dor(0, ~0, 8);  /* avoid immediate interrupt */
 
     for (fdc = 0; fdc < N_FDC; fdc++)
         if (fdc_state[fdc].address != -1)
             fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR);
     /*
      * The driver will try and free resources and relies on us
      * to know if they were allocated or not.
      */
     current_fdc = 0;
     irqdma_allocated = 1;
     return 0;
 cleanup:
     fd_free_irq();
     fd_free_dma();
     while (--fdc >= 0)
         floppy_release_regions(fdc);
     current_fdc = 0;
     atomic_dec(&usage_count);
     return -1;
 }
 
 static void floppy_release_irq_and_dma(void)
 {
     int fdc;
 #ifndef __sparc__
     int drive;
 #endif
     long tmpsize;
     unsigned long tmpaddr;
 
     if (!atomic_dec_and_test(&usage_count))
         return;
 
     if (irqdma_allocated) {
         fd_disable_dma();
         fd_free_dma();
         fd_free_irq();
         irqdma_allocated = 0;
     }
     set_dor(0, ~0, 8);
 #if N_FDC > 1
     set_dor(1, ~8, 0);
 #endif
 
     if (floppy_track_buffer && max_buffer_sectors) {
         tmpsize = max_buffer_sectors * 1024;
         tmpaddr = (unsigned long)floppy_track_buffer;
         floppy_track_buffer = NULL;
         max_buffer_sectors = 0;
         buffer_min = buffer_max = -1;
         fd_dma_mem_free(tmpaddr, tmpsize);
     }
 #ifndef __sparc__
     for (drive = 0; drive < N_FDC * 4; drive++)
         if (timer_pending(motor_off_timer + drive))
             pr_info("motor off timer %d still active\n", drive);
 #endif
 
     if (delayed_work_pending(&fd_timeout))
         pr_info("floppy timer still active:%s\n", timeout_message);
     if (delayed_work_pending(&fd_timer))
         pr_info("auxiliary floppy timer still active\n");
     if (work_pending(&floppy_work))
         pr_info("work still pending\n");
     for (fdc = 0; fdc < N_FDC; fdc++)
         if (fdc_state[fdc].address != -1)
             floppy_release_regions(fdc);
 }
 
 #ifdef MODULE
 
 static char *floppy;
 
 static void __init parse_floppy_cfg_string(char *cfg)
 {
     char *ptr;
 
     while (*cfg) {
         ptr = cfg;
         while (*cfg && *cfg != ' ' && *cfg != '\t')
             cfg++;
         if (*cfg) {
             *cfg = '\0';
             cfg++;
         }
         if (*ptr)
             floppy_setup(ptr);
     }
 }
 
 static int __init floppy_module_init(void)
 {
     if (floppy)
         parse_floppy_cfg_string(floppy);
     return floppy_init();
 }
 module_init(floppy_module_init);
 
 static void __exit floppy_module_exit(void)
 {
     int drive, i;
 
     unregister_blkdev(FLOPPY_MAJOR, "fd");
     platform_driver_unregister(&floppy_driver);
 
     destroy_workqueue(floppy_wq);
 
     for (drive = 0; drive < N_DRIVE; drive++) {
         del_timer_sync(&motor_off_timer[drive]);
 
         if (floppy_available(drive)) {
             for (i = 0; i < ARRAY_SIZE(floppy_type); i++) {
                 if (disks[drive][i])
                     del_gendisk(disks[drive][i]);
             }
             if (registered[drive])
                 platform_device_unregister(&floppy_device[drive]);
         }
         for (i = 0; i < ARRAY_SIZE(floppy_type); i++) {
             if (disks[drive][i])
                 put_disk(disks[drive][i]);
         }
         blk_mq_free_tag_set(&tag_sets[drive]);
     }
 
     cancel_delayed_work_sync(&fd_timeout);
     cancel_delayed_work_sync(&fd_timer);
 
     if (atomic_read(&usage_count))
         floppy_release_irq_and_dma();
 
     /* eject disk, if any */
     fd_eject(0);
 }
 
 module_exit(floppy_module_exit);
 
 module_param(floppy, charp, 0);
 module_param(FLOPPY_IRQ, int, 0);
 module_param(FLOPPY_DMA, int, 0);
 MODULE_AUTHOR("Alain L. Knaff");
 MODULE_LICENSE("GPL");
 
 /* This doesn't actually get used other than for module information */
 static const struct pnp_device_id floppy_pnpids[] = {
     {"PNP0700", 0},
     {}
 };
 
 MODULE_DEVICE_TABLE(pnp, floppy_pnpids);
 
 #else
 
 __setup("floppy=", floppy_setup);
 module_init(floppy_init)
 #endif
 
 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);