OSCL-LXR linux-6.0.1/​drivers/​usb/​misc/​usbtest.c	Source navigation Diff markup Identifier search General search
	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
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/scatterlist.h>
 #include <linux/mutex.h>
 #include <linux/timer.h>
 #include <linux/usb.h>
 
 #define SIMPLE_IO_TIMEOUT   10000   /* in milliseconds */
 
 /*-------------------------------------------------------------------------*/
 
 static int override_alt = -1;
 module_param_named(alt, override_alt, int, 0644);
 MODULE_PARM_DESC(alt, ">= 0 to override altsetting selection");
 static void complicated_callback(struct urb *urb);
 
 /*-------------------------------------------------------------------------*/
 
 /* FIXME make these public somewhere; usbdevfs.h? */
 
 /* Parameter for usbtest driver. */
 struct usbtest_param_32 {
     /* inputs */
     __u32       test_num;   /* 0..(TEST_CASES-1) */
     __u32       iterations;
     __u32       length;
     __u32       vary;
     __u32       sglen;
 
     /* outputs */
     __s32       duration_sec;
     __s32       duration_usec;
 };
 
 /*
  * Compat parameter to the usbtest driver.
  * This supports older user space binaries compiled with 64 bit compiler.
  */
 struct usbtest_param_64 {
     /* inputs */
     __u32       test_num;   /* 0..(TEST_CASES-1) */
     __u32       iterations;
     __u32       length;
     __u32       vary;
     __u32       sglen;
 
     /* outputs */
     __s64       duration_sec;
     __s64       duration_usec;
 };
 
 /* IOCTL interface to the driver. */
 #define USBTEST_REQUEST_32    _IOWR('U', 100, struct usbtest_param_32)
 /* COMPAT IOCTL interface to the driver. */
 #define USBTEST_REQUEST_64    _IOWR('U', 100, struct usbtest_param_64)
 
 /*-------------------------------------------------------------------------*/
 
 #define GENERIC     /* let probe() bind using module params */
 
 /* Some devices that can be used for testing will have "real" drivers.
  * Entries for those need to be enabled here by hand, after disabling
  * that "real" driver.
  */
 //#define   IBOT2       /* grab iBOT2 webcams */
 //#define   KEYSPAN_19Qi    /* grab un-renumerated serial adapter */
 
 /*-------------------------------------------------------------------------*/
 
 struct usbtest_info {
     const char      *name;
     u8          ep_in;      /* bulk/intr source */
     u8          ep_out;     /* bulk/intr sink */
     unsigned        autoconf:1;
     unsigned        ctrl_out:1;
     unsigned        iso:1;      /* try iso in/out */
     unsigned        intr:1;     /* try interrupt in/out */
     int         alt;
 };
 
 /* this is accessed only through usbfs ioctl calls.
  * one ioctl to issue a test ... one lock per device.
  * tests create other threads if they need them.
  * urbs and buffers are allocated dynamically,
  * and data generated deterministically.
  */
 struct usbtest_dev {
     struct usb_interface    *intf;
     struct usbtest_info *info;
     int         in_pipe;
     int         out_pipe;
     int         in_iso_pipe;
     int         out_iso_pipe;
     int         in_int_pipe;
     int         out_int_pipe;
     struct usb_endpoint_descriptor  *iso_in, *iso_out;
     struct usb_endpoint_descriptor  *int_in, *int_out;
     struct mutex        lock;
 
 #define TBUF_SIZE   256
     u8          *buf;
 };
 
 static struct usb_device *testdev_to_usbdev(struct usbtest_dev *test)
 {
     return interface_to_usbdev(test->intf);
 }
 
 /* set up all urbs so they can be used with either bulk or interrupt */
 #define INTERRUPT_RATE      1   /* msec/transfer */
 
 #define ERROR(tdev, fmt, args...) \
     dev_err(&(tdev)->intf->dev , fmt , ## args)
 #define WARNING(tdev, fmt, args...) \
     dev_warn(&(tdev)->intf->dev , fmt , ## args)
 
 #define GUARD_BYTE  0xA5
 #define MAX_SGLEN   128
 
 /*-------------------------------------------------------------------------*/
 
 static inline void endpoint_update(int edi,
                    struct usb_host_endpoint **in,
                    struct usb_host_endpoint **out,
                    struct usb_host_endpoint *e)
 {
     if (edi) {
         if (!*in)
             *in = e;
     } else {
         if (!*out)
             *out = e;
     }
 }
 
 static int
 get_endpoints(struct usbtest_dev *dev, struct usb_interface *intf)
 {
     int             tmp;
     struct usb_host_interface   *alt;
     struct usb_host_endpoint    *in, *out;
     struct usb_host_endpoint    *iso_in, *iso_out;
     struct usb_host_endpoint    *int_in, *int_out;
     struct usb_device       *udev;
 
     for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
         unsigned    ep;
 
         in = out = NULL;
         iso_in = iso_out = NULL;
         int_in = int_out = NULL;
         alt = intf->altsetting + tmp;
 
         if (override_alt >= 0 &&
                 override_alt != alt->desc.bAlternateSetting)
             continue;
 
         /* take the first altsetting with in-bulk + out-bulk;
          * ignore other endpoints and altsettings.
          */
         for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
             struct usb_host_endpoint    *e;
             int edi;
 
             e = alt->endpoint + ep;
             edi = usb_endpoint_dir_in(&e->desc);
 
             switch (usb_endpoint_type(&e->desc)) {
             case USB_ENDPOINT_XFER_BULK:
                 endpoint_update(edi, &in, &out, e);
                 continue;
             case USB_ENDPOINT_XFER_INT:
                 if (dev->info->intr)
                     endpoint_update(edi, &int_in, &int_out, e);
                 continue;
             case USB_ENDPOINT_XFER_ISOC:
                 if (dev->info->iso)
                     endpoint_update(edi, &iso_in, &iso_out, e);
                 fallthrough;
             default:
                 continue;
             }
         }
         if ((in && out)  ||  iso_in || iso_out || int_in || int_out)
             goto found;
     }
     return -EINVAL;
 
 found:
     udev = testdev_to_usbdev(dev);
     dev->info->alt = alt->desc.bAlternateSetting;
     if (alt->desc.bAlternateSetting != 0) {
         tmp = usb_set_interface(udev,
                 alt->desc.bInterfaceNumber,
                 alt->desc.bAlternateSetting);
         if (tmp < 0)
             return tmp;
     }
 
     if (in)
         dev->in_pipe = usb_rcvbulkpipe(udev,
             in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
     if (out)
         dev->out_pipe = usb_sndbulkpipe(udev,
             out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
 
     if (iso_in) {
         dev->iso_in = &iso_in->desc;
         dev->in_iso_pipe = usb_rcvisocpipe(udev,
                 iso_in->desc.bEndpointAddress
                     & USB_ENDPOINT_NUMBER_MASK);
     }
 
     if (iso_out) {
         dev->iso_out = &iso_out->desc;
         dev->out_iso_pipe = usb_sndisocpipe(udev,
                 iso_out->desc.bEndpointAddress
                     & USB_ENDPOINT_NUMBER_MASK);
     }
 
     if (int_in) {
         dev->int_in = &int_in->desc;
         dev->in_int_pipe = usb_rcvintpipe(udev,
                 int_in->desc.bEndpointAddress
                     & USB_ENDPOINT_NUMBER_MASK);
     }
 
     if (int_out) {
         dev->int_out = &int_out->desc;
         dev->out_int_pipe = usb_sndintpipe(udev,
                 int_out->desc.bEndpointAddress
                     & USB_ENDPOINT_NUMBER_MASK);
     }
     return 0;
 }
 
 /*-------------------------------------------------------------------------*/
 
 /* Support for testing basic non-queued I/O streams.
  *
  * These just package urbs as requests that can be easily canceled.
  * Each urb's data buffer is dynamically allocated; callers can fill
  * them with non-zero test data (or test for it) when appropriate.
  */
 
 static void simple_callback(struct urb *urb)
 {
     complete(urb->context);
 }
 
 static struct urb *usbtest_alloc_urb(
     struct usb_device   *udev,
     int         pipe,
     unsigned long       bytes,
     unsigned        transfer_flags,
     unsigned        offset,
     u8          bInterval,
     usb_complete_t      complete_fn)
 {
     struct urb      *urb;
 
     urb = usb_alloc_urb(0, GFP_KERNEL);
     if (!urb)
         return urb;
 
     if (bInterval)
         usb_fill_int_urb(urb, udev, pipe, NULL, bytes, complete_fn,
                 NULL, bInterval);
     else
         usb_fill_bulk_urb(urb, udev, pipe, NULL, bytes, complete_fn,
                 NULL);
 
     urb->interval = (udev->speed == USB_SPEED_HIGH)
             ? (INTERRUPT_RATE << 3)
             : INTERRUPT_RATE;
     urb->transfer_flags = transfer_flags;
     if (usb_pipein(pipe))
         urb->transfer_flags |= URB_SHORT_NOT_OK;
 
     if ((bytes + offset) == 0)
         return urb;
 
     if (urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)
         urb->transfer_buffer = usb_alloc_coherent(udev, bytes + offset,
             GFP_KERNEL, &urb->transfer_dma);
     else
         urb->transfer_buffer = kmalloc(bytes + offset, GFP_KERNEL);
 
     if (!urb->transfer_buffer) {
         usb_free_urb(urb);
         return NULL;
     }
 
     /* To test unaligned transfers add an offset and fill the
         unused memory with a guard value */
     if (offset) {
         memset(urb->transfer_buffer, GUARD_BYTE, offset);
         urb->transfer_buffer += offset;
         if (urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)
             urb->transfer_dma += offset;
     }
 
     /* For inbound transfers use guard byte so that test fails if
         data not correctly copied */
     memset(urb->transfer_buffer,
             usb_pipein(urb->pipe) ? GUARD_BYTE : 0,
             bytes);
     return urb;
 }
 
 static struct urb *simple_alloc_urb(
     struct usb_device   *udev,
     int         pipe,
     unsigned long       bytes,
     u8          bInterval)
 {
     return usbtest_alloc_urb(udev, pipe, bytes, URB_NO_TRANSFER_DMA_MAP, 0,
             bInterval, simple_callback);
 }
 
 static struct urb *complicated_alloc_urb(
     struct usb_device   *udev,
     int         pipe,
     unsigned long       bytes,
     u8          bInterval)
 {
     return usbtest_alloc_urb(udev, pipe, bytes, URB_NO_TRANSFER_DMA_MAP, 0,
             bInterval, complicated_callback);
 }
 
 static unsigned pattern;
 static unsigned mod_pattern;
 module_param_named(pattern, mod_pattern, uint, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(mod_pattern, "i/o pattern (0 == zeroes)");
 
 static unsigned get_maxpacket(struct usb_device *udev, int pipe)
 {
     struct usb_host_endpoint    *ep;
 
     ep = usb_pipe_endpoint(udev, pipe);
     return le16_to_cpup(&ep->desc.wMaxPacketSize);
 }
 
 static int ss_isoc_get_packet_num(struct usb_device *udev, int pipe)
 {
     struct usb_host_endpoint *ep = usb_pipe_endpoint(udev, pipe);
 
     return USB_SS_MULT(ep->ss_ep_comp.bmAttributes)
         * (1 + ep->ss_ep_comp.bMaxBurst);
 }
 
 static void simple_fill_buf(struct urb *urb)
 {
     unsigned    i;
     u8      *buf = urb->transfer_buffer;
     unsigned    len = urb->transfer_buffer_length;
     unsigned    maxpacket;
 
     switch (pattern) {
     default:
         fallthrough;
     case 0:
         memset(buf, 0, len);
         break;
     case 1:         /* mod63 */
         maxpacket = get_maxpacket(urb->dev, urb->pipe);
         for (i = 0; i < len; i++)
             *buf++ = (u8) ((i % maxpacket) % 63);
         break;
     }
 }
 
 static inline unsigned long buffer_offset(void *buf)
 {
     return (unsigned long)buf & (ARCH_KMALLOC_MINALIGN - 1);
 }
 
 static int check_guard_bytes(struct usbtest_dev *tdev, struct urb *urb)
 {
     u8 *buf = urb->transfer_buffer;
     u8 *guard = buf - buffer_offset(buf);
     unsigned i;
 
     for (i = 0; guard < buf; i++, guard++) {
         if (*guard != GUARD_BYTE) {
             ERROR(tdev, "guard byte[%d] %d (not %d)\n",
                 i, *guard, GUARD_BYTE);
             return -EINVAL;
         }
     }
     return 0;
 }
 
 static int simple_check_buf(struct usbtest_dev *tdev, struct urb *urb)
 {
     unsigned    i;
     u8      expected;
     u8      *buf = urb->transfer_buffer;
     unsigned    len = urb->actual_length;
     unsigned    maxpacket = get_maxpacket(urb->dev, urb->pipe);
 
     int ret = check_guard_bytes(tdev, urb);
     if (ret)
         return ret;
 
     for (i = 0; i < len; i++, buf++) {
         switch (pattern) {
         /* all-zeroes has no synchronization issues */
         case 0:
             expected = 0;
             break;
         /* mod63 stays in sync with short-terminated transfers,
          * or otherwise when host and gadget agree on how large
          * each usb transfer request should be.  resync is done
          * with set_interface or set_config.
          */
         case 1:         /* mod63 */
             expected = (i % maxpacket) % 63;
             break;
         /* always fail unsupported patterns */
         default:
             expected = !*buf;
             break;
         }
         if (*buf == expected)
             continue;
         ERROR(tdev, "buf[%d] = %d (not %d)\n", i, *buf, expected);
         return -EINVAL;
     }
     return 0;
 }
 
 static void simple_free_urb(struct urb *urb)
 {
     unsigned long offset = buffer_offset(urb->transfer_buffer);
 
     if (urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)
         usb_free_coherent(
             urb->dev,
             urb->transfer_buffer_length + offset,
             urb->transfer_buffer - offset,
             urb->transfer_dma - offset);
     else
         kfree(urb->transfer_buffer - offset);
     usb_free_urb(urb);
 }
 
 static int simple_io(
     struct usbtest_dev  *tdev,
     struct urb      *urb,
     int         iterations,
     int         vary,
     int         expected,
     const char      *label
 )
 {
     struct usb_device   *udev = urb->dev;
     int         max = urb->transfer_buffer_length;
     struct completion   completion;
     int         retval = 0;
     unsigned long       expire;
 
     urb->context = &completion;
     while (retval == 0 && iterations-- > 0) {
         init_completion(&completion);
         if (usb_pipeout(urb->pipe)) {
             simple_fill_buf(urb);
             urb->transfer_flags |= URB_ZERO_PACKET;
         }
         retval = usb_submit_urb(urb, GFP_KERNEL);
         if (retval != 0)
             break;
 
         expire = msecs_to_jiffies(SIMPLE_IO_TIMEOUT);
         if (!wait_for_completion_timeout(&completion, expire)) {
             usb_kill_urb(urb);
             retval = (urb->status == -ENOENT ?
                   -ETIMEDOUT : urb->status);
         } else {
             retval = urb->status;
         }
 
         urb->dev = udev;
         if (retval == 0 && usb_pipein(urb->pipe))
             retval = simple_check_buf(tdev, urb);
 
         if (vary) {
             int len = urb->transfer_buffer_length;
 
             len += vary;
             len %= max;
             if (len == 0)
                 len = (vary < max) ? vary : max;
             urb->transfer_buffer_length = len;
         }
 
         /* FIXME if endpoint halted, clear halt (and log) */
     }
     urb->transfer_buffer_length = max;
 
     if (expected != retval)
         dev_err(&udev->dev,
             "%s failed, iterations left %d, status %d (not %d)\n",
                 label, iterations, retval, expected);
     return retval;
 }
 
 
 /*-------------------------------------------------------------------------*/
 
 /* We use scatterlist primitives to test queued I/O.
  * Yes, this also tests the scatterlist primitives.
  */
 
 static void free_sglist(struct scatterlist *sg, int nents)
 {
     unsigned        i;
 
     if (!sg)
         return;
     for (i = 0; i < nents; i++) {
         if (!sg_page(&sg[i]))
             continue;
         kfree(sg_virt(&sg[i]));
     }
     kfree(sg);
 }
 
 static struct scatterlist *
 alloc_sglist(int nents, int max, int vary, struct usbtest_dev *dev, int pipe)
 {
     struct scatterlist  *sg;
     unsigned int        n_size = 0;
     unsigned        i;
     unsigned        size = max;
     unsigned        maxpacket =
         get_maxpacket(interface_to_usbdev(dev->intf), pipe);
 
     if (max == 0)
         return NULL;
 
     sg = kmalloc_array(nents, sizeof(*sg), GFP_KERNEL);
     if (!sg)
         return NULL;
     sg_init_table(sg, nents);
 
     for (i = 0; i < nents; i++) {
         char        *buf;
         unsigned    j;
 
         buf = kzalloc(size, GFP_KERNEL);
         if (!buf) {
             free_sglist(sg, i);
             return NULL;
         }
 
         /* kmalloc pages are always physically contiguous! */
         sg_set_buf(&sg[i], buf, size);
 
         switch (pattern) {
         case 0:
             /* already zeroed */
             break;
         case 1:
             for (j = 0; j < size; j++)
                 *buf++ = (u8) (((j + n_size) % maxpacket) % 63);
             n_size += size;
             break;
         }
 
         if (vary) {
             size += vary;
             size %= max;
             if (size == 0)
                 size = (vary < max) ? vary : max;
         }
     }
 
     return sg;
 }
 
 struct sg_timeout {
     struct timer_list timer;
     struct usb_sg_request *req;
 };
 
 static void sg_timeout(struct timer_list *t)
 {
     struct sg_timeout *timeout = from_timer(timeout, t, timer);
 
     usb_sg_cancel(timeout->req);
 }
 
 static int perform_sglist(
     struct usbtest_dev  *tdev,
     unsigned        iterations,
     int         pipe,
     struct usb_sg_request   *req,
     struct scatterlist  *sg,
     int         nents
 )
 {
     struct usb_device   *udev = testdev_to_usbdev(tdev);
     int         retval = 0;
     struct sg_timeout   timeout = {
         .req = req,
     };
 
     timer_setup_on_stack(&timeout.timer, sg_timeout, 0);
 
     while (retval == 0 && iterations-- > 0) {
         retval = usb_sg_init(req, udev, pipe,
                 (udev->speed == USB_SPEED_HIGH)
                     ? (INTERRUPT_RATE << 3)
                     : INTERRUPT_RATE,
                 sg, nents, 0, GFP_KERNEL);
 
         if (retval)
             break;
         mod_timer(&timeout.timer, jiffies +
                 msecs_to_jiffies(SIMPLE_IO_TIMEOUT));
         usb_sg_wait(req);
         if (!del_timer_sync(&timeout.timer))
             retval = -ETIMEDOUT;
         else
             retval = req->status;
         destroy_timer_on_stack(&timeout.timer);
 
         /* FIXME check resulting data pattern */
 
         /* FIXME if endpoint halted, clear halt (and log) */
     }
 
     /* FIXME for unlink or fault handling tests, don't report
      * failure if retval is as we expected ...
      */
     if (retval)
         ERROR(tdev, "perform_sglist failed, "
                 "iterations left %d, status %d\n",
                 iterations, retval);
     return retval;
 }
 
 
 /*-------------------------------------------------------------------------*/
 
 /* unqueued control message testing
  *
  * there's a nice set of device functional requirements in chapter 9 of the
  * usb 2.0 spec, which we can apply to ANY device, even ones that don't use
  * special test firmware.
  *
  * we know the device is configured (or suspended) by the time it's visible
  * through usbfs.  we can't change that, so we won't test enumeration (which
  * worked 'well enough' to get here, this time), power management (ditto),
  * or remote wakeup (which needs human interaction).
  */
 
 static unsigned realworld = 1;
 module_param(realworld, uint, 0);
 MODULE_PARM_DESC(realworld, "clear to demand stricter spec compliance");
 
 static int get_altsetting(struct usbtest_dev *dev)
 {
     struct usb_interface    *iface = dev->intf;
     struct usb_device   *udev = interface_to_usbdev(iface);
     int         retval;
 
     retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
             USB_REQ_GET_INTERFACE, USB_DIR_IN|USB_RECIP_INTERFACE,
             0, iface->altsetting[0].desc.bInterfaceNumber,
             dev->buf, 1, USB_CTRL_GET_TIMEOUT);
     switch (retval) {
     case 1:
         return dev->buf[0];
     case 0:
         retval = -ERANGE;
         fallthrough;
     default:
         return retval;
     }
 }
 
 static int set_altsetting(struct usbtest_dev *dev, int alternate)
 {
     struct usb_interface        *iface = dev->intf;
     struct usb_device       *udev;
 
     if (alternate < 0 || alternate >= 256)
         return -EINVAL;
 
     udev = interface_to_usbdev(iface);
     return usb_set_interface(udev,
             iface->altsetting[0].desc.bInterfaceNumber,
             alternate);
 }
 
 static int is_good_config(struct usbtest_dev *tdev, int len)
 {
     struct usb_config_descriptor    *config;
 
     if (len < sizeof(*config))
         return 0;
     config = (struct usb_config_descriptor *) tdev->buf;
 
     switch (config->bDescriptorType) {
     case USB_DT_CONFIG:
     case USB_DT_OTHER_SPEED_CONFIG:
         if (config->bLength != 9) {
             ERROR(tdev, "bogus config descriptor length\n");
             return 0;
         }
         /* this bit 'must be 1' but often isn't */
         if (!realworld && !(config->bmAttributes & 0x80)) {
             ERROR(tdev, "high bit of config attributes not set\n");
             return 0;
         }
         if (config->bmAttributes & 0x1f) {  /* reserved == 0 */
             ERROR(tdev, "reserved config bits set\n");
             return 0;
         }
         break;
     default:
         return 0;
     }
 
     if (le16_to_cpu(config->wTotalLength) == len)   /* read it all */
         return 1;
     if (le16_to_cpu(config->wTotalLength) >= TBUF_SIZE) /* max partial read */
         return 1;
     ERROR(tdev, "bogus config descriptor read size\n");
     return 0;
 }
 
 static int is_good_ext(struct usbtest_dev *tdev, u8 *buf)
 {
     struct usb_ext_cap_descriptor *ext;
     u32 attr;
 
     ext = (struct usb_ext_cap_descriptor *) buf;
 
     if (ext->bLength != USB_DT_USB_EXT_CAP_SIZE) {
         ERROR(tdev, "bogus usb 2.0 extension descriptor length\n");
         return 0;
     }
 
     attr = le32_to_cpu(ext->bmAttributes);
     /* bits[1:15] is used and others are reserved */
     if (attr & ~0xfffe) {   /* reserved == 0 */
         ERROR(tdev, "reserved bits set\n");
         return 0;
     }
 
     return 1;
 }
 
 static int is_good_ss_cap(struct usbtest_dev *tdev, u8 *buf)
 {
     struct usb_ss_cap_descriptor *ss;
 
     ss = (struct usb_ss_cap_descriptor *) buf;
 
     if (ss->bLength != USB_DT_USB_SS_CAP_SIZE) {
         ERROR(tdev, "bogus superspeed device capability descriptor length\n");
         return 0;
     }
 
     /*
      * only bit[1] of bmAttributes is used for LTM and others are
      * reserved
      */
     if (ss->bmAttributes & ~0x02) { /* reserved == 0 */
         ERROR(tdev, "reserved bits set in bmAttributes\n");
         return 0;
     }
 
     /* bits[0:3] of wSpeedSupported is used and others are reserved */
     if (le16_to_cpu(ss->wSpeedSupported) & ~0x0f) { /* reserved == 0 */
         ERROR(tdev, "reserved bits set in wSpeedSupported\n");
         return 0;
     }
 
     return 1;
 }
 
 static int is_good_con_id(struct usbtest_dev *tdev, u8 *buf)
 {
     struct usb_ss_container_id_descriptor *con_id;
 
     con_id = (struct usb_ss_container_id_descriptor *) buf;
 
     if (con_id->bLength != USB_DT_USB_SS_CONTN_ID_SIZE) {
         ERROR(tdev, "bogus container id descriptor length\n");
         return 0;
     }
 
     if (con_id->bReserved) {    /* reserved == 0 */
         ERROR(tdev, "reserved bits set\n");
         return 0;
     }
 
     return 1;
 }
 
 /* sanity test for standard requests working with usb_control_mesg() and some
  * of the utility functions which use it.
  *
  * this doesn't test how endpoint halts behave or data toggles get set, since
  * we won't do I/O to bulk/interrupt endpoints here (which is how to change
  * halt or toggle).  toggle testing is impractical without support from hcds.
  *
  * this avoids failing devices linux would normally work with, by not testing
  * config/altsetting operations for devices that only support their defaults.
  * such devices rarely support those needless operations.
  *
  * NOTE that since this is a sanity test, it's not examining boundary cases
  * to see if usbcore, hcd, and device all behave right.  such testing would
  * involve varied read sizes and other operation sequences.
  */
 static int ch9_postconfig(struct usbtest_dev *dev)
 {
     struct usb_interface    *iface = dev->intf;
     struct usb_device   *udev = interface_to_usbdev(iface);
     int         i, alt, retval;
 
     /* [9.2.3] if there's more than one altsetting, we need to be able to
      * set and get each one.  mostly trusts the descriptors from usbcore.
      */
     for (i = 0; i < iface->num_altsetting; i++) {
 
         /* 9.2.3 constrains the range here */
         alt = iface->altsetting[i].desc.bAlternateSetting;
         if (alt < 0 || alt >= iface->num_altsetting) {
             dev_err(&iface->dev,
                     "invalid alt [%d].bAltSetting = %d\n",
                     i, alt);
         }
 
         /* [real world] get/set unimplemented if there's only one */
         if (realworld && iface->num_altsetting == 1)
             continue;
 
         /* [9.4.10] set_interface */
         retval = set_altsetting(dev, alt);
         if (retval) {
             dev_err(&iface->dev, "can't set_interface = %d, %d\n",
                     alt, retval);
             return retval;
         }
 
         /* [9.4.4] get_interface always works */
         retval = get_altsetting(dev);
         if (retval != alt) {
             dev_err(&iface->dev, "get alt should be %d, was %d\n",
                     alt, retval);
             return (retval < 0) ? retval : -EDOM;
         }
 
     }
 
     /* [real world] get_config unimplemented if there's only one */
     if (!realworld || udev->descriptor.bNumConfigurations != 1) {
         int expected = udev->actconfig->desc.bConfigurationValue;
 
         /* [9.4.2] get_configuration always works
          * ... although some cheap devices (like one TI Hub I've got)
          * won't return config descriptors except before set_config.
          */
         retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
                 USB_REQ_GET_CONFIGURATION,
                 USB_DIR_IN | USB_RECIP_DEVICE,
                 0, 0, dev->buf, 1, USB_CTRL_GET_TIMEOUT);
         if (retval != 1 || dev->buf[0] != expected) {
             dev_err(&iface->dev, "get config --> %d %d (1 %d)\n",
                 retval, dev->buf[0], expected);
             return (retval < 0) ? retval : -EDOM;
         }
     }
 
     /* there's always [9.4.3] a device descriptor [9.6.1] */
     retval = usb_get_descriptor(udev, USB_DT_DEVICE, 0,
             dev->buf, sizeof(udev->descriptor));
     if (retval != sizeof(udev->descriptor)) {
         dev_err(&iface->dev, "dev descriptor --> %d\n", retval);
         return (retval < 0) ? retval : -EDOM;
     }
 
     /*
      * there's always [9.4.3] a bos device descriptor [9.6.2] in USB
      * 3.0 spec
      */
     if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0210) {
         struct usb_bos_descriptor *bos = NULL;
         struct usb_dev_cap_header *header = NULL;
         unsigned total, num, length;
         u8 *buf;
 
         retval = usb_get_descriptor(udev, USB_DT_BOS, 0, dev->buf,
                 sizeof(*udev->bos->desc));
         if (retval != sizeof(*udev->bos->desc)) {
             dev_err(&iface->dev, "bos descriptor --> %d\n", retval);
             return (retval < 0) ? retval : -EDOM;
         }
 
         bos = (struct usb_bos_descriptor *)dev->buf;
         total = le16_to_cpu(bos->wTotalLength);
         num = bos->bNumDeviceCaps;
 
         if (total > TBUF_SIZE)
             total = TBUF_SIZE;
 
         /*
          * get generic device-level capability descriptors [9.6.2]
          * in USB 3.0 spec
          */
         retval = usb_get_descriptor(udev, USB_DT_BOS, 0, dev->buf,
                 total);
         if (retval != total) {
             dev_err(&iface->dev, "bos descriptor set --> %d\n",
                     retval);
             return (retval < 0) ? retval : -EDOM;
         }
 
         length = sizeof(*udev->bos->desc);
         buf = dev->buf;
         for (i = 0; i < num; i++) {
             buf += length;
             if (buf + sizeof(struct usb_dev_cap_header) >
                     dev->buf + total)
                 break;
 
             header = (struct usb_dev_cap_header *)buf;
             length = header->bLength;
 
             if (header->bDescriptorType !=
                     USB_DT_DEVICE_CAPABILITY) {
                 dev_warn(&udev->dev, "not device capability descriptor, skip\n");
                 continue;
             }
 
             switch (header->bDevCapabilityType) {
             case USB_CAP_TYPE_EXT:
                 if (buf + USB_DT_USB_EXT_CAP_SIZE >
                         dev->buf + total ||
                         !is_good_ext(dev, buf)) {
                     dev_err(&iface->dev, "bogus usb 2.0 extension descriptor\n");
                     return -EDOM;
                 }
                 break;
             case USB_SS_CAP_TYPE:
                 if (buf + USB_DT_USB_SS_CAP_SIZE >
                         dev->buf + total ||
                         !is_good_ss_cap(dev, buf)) {
                     dev_err(&iface->dev, "bogus superspeed device capability descriptor\n");
                     return -EDOM;
                 }
                 break;
             case CONTAINER_ID_TYPE:
                 if (buf + USB_DT_USB_SS_CONTN_ID_SIZE >
                         dev->buf + total ||
                         !is_good_con_id(dev, buf)) {
                     dev_err(&iface->dev, "bogus container id descriptor\n");
                     return -EDOM;
                 }
                 break;
             default:
                 break;
             }
         }
     }
 
     /* there's always [9.4.3] at least one config descriptor [9.6.3] */
     for (i = 0; i < udev->descriptor.bNumConfigurations; i++) {
         retval = usb_get_descriptor(udev, USB_DT_CONFIG, i,
                 dev->buf, TBUF_SIZE);
         if (!is_good_config(dev, retval)) {
             dev_err(&iface->dev,
                     "config [%d] descriptor --> %d\n",
                     i, retval);
             return (retval < 0) ? retval : -EDOM;
         }
 
         /* FIXME cross-checking udev->config[i] to make sure usbcore
          * parsed it right (etc) would be good testing paranoia
          */
     }
 
     /* and sometimes [9.2.6.6] speed dependent descriptors */
     if (le16_to_cpu(udev->descriptor.bcdUSB) == 0x0200) {
         struct usb_qualifier_descriptor *d = NULL;
 
         /* device qualifier [9.6.2] */
         retval = usb_get_descriptor(udev,
                 USB_DT_DEVICE_QUALIFIER, 0, dev->buf,
                 sizeof(struct usb_qualifier_descriptor));
         if (retval == -EPIPE) {
             if (udev->speed == USB_SPEED_HIGH) {
                 dev_err(&iface->dev,
                         "hs dev qualifier --> %d\n",
                         retval);
                 return retval;
             }
             /* usb2.0 but not high-speed capable; fine */
         } else if (retval != sizeof(struct usb_qualifier_descriptor)) {
             dev_err(&iface->dev, "dev qualifier --> %d\n", retval);
             return (retval < 0) ? retval : -EDOM;
         } else
             d = (struct usb_qualifier_descriptor *) dev->buf;
 
         /* might not have [9.6.2] any other-speed configs [9.6.4] */
         if (d) {
             unsigned max = d->bNumConfigurations;
             for (i = 0; i < max; i++) {
                 retval = usb_get_descriptor(udev,
                     USB_DT_OTHER_SPEED_CONFIG, i,
                     dev->buf, TBUF_SIZE);
                 if (!is_good_config(dev, retval)) {
                     dev_err(&iface->dev,
                         "other speed config --> %d\n",
                         retval);
                     return (retval < 0) ? retval : -EDOM;
                 }
             }
         }
     }
     /* FIXME fetch strings from at least the device descriptor */
 
     /* [9.4.5] get_status always works */
     retval = usb_get_std_status(udev, USB_RECIP_DEVICE, 0, dev->buf);
     if (retval) {
         dev_err(&iface->dev, "get dev status --> %d\n", retval);
         return retval;
     }
 
     /* FIXME configuration.bmAttributes says if we could try to set/clear
      * the device's remote wakeup feature ... if we can, test that here
      */
 
     retval = usb_get_std_status(udev, USB_RECIP_INTERFACE,
             iface->altsetting[0].desc.bInterfaceNumber, dev->buf);
     if (retval) {
         dev_err(&iface->dev, "get interface status --> %d\n", retval);
         return retval;
     }
     /* FIXME get status for each endpoint in the interface */
 
     return 0;
 }
 
 /*-------------------------------------------------------------------------*/
 
 /* use ch9 requests to test whether:
  *   (a) queues work for control, keeping N subtests queued and
  *       active (auto-resubmit) for M loops through the queue.
  *   (b) protocol stalls (control-only) will autorecover.
  *       it's not like bulk/intr; no halt clearing.
  *   (c) short control reads are reported and handled.
  *   (d) queues are always processed in-order
  */
 
 struct ctrl_ctx {
     spinlock_t      lock;
     struct usbtest_dev  *dev;
     struct completion   complete;
     unsigned        count;
     unsigned        pending;
     int         status;
     struct urb      **urb;
     struct usbtest_param_32 *param;
     int         last;
 };
 
 #define NUM_SUBCASES    16      /* how many test subcases here? */
 
 struct subcase {
     struct usb_ctrlrequest  setup;
     int         number;
     int         expected;
 };
 
 static void ctrl_complete(struct urb *urb)
 {
     struct ctrl_ctx     *ctx = urb->context;
     struct usb_ctrlrequest  *reqp;
     struct subcase      *subcase;
     int         status = urb->status;
     unsigned long       flags;
 
     reqp = (struct usb_ctrlrequest *)urb->setup_packet;
     subcase = container_of(reqp, struct subcase, setup);
 
     spin_lock_irqsave(&ctx->lock, flags);
     ctx->count--;
     ctx->pending--;
 
     /* queue must transfer and complete in fifo order, unless
      * usb_unlink_urb() is used to unlink something not at the
      * physical queue head (not tested).
      */
     if (subcase->number > 0) {
         if ((subcase->number - ctx->last) != 1) {
             ERROR(ctx->dev,
                 "subcase %d completed out of order, last %d\n",
                 subcase->number, ctx->last);
             status = -EDOM;
             ctx->last = subcase->number;
             goto error;
         }
     }
     ctx->last = subcase->number;
 
     /* succeed or fault in only one way? */
     if (status == subcase->expected)
         status = 0;
 
     /* async unlink for cleanup? */
     else if (status != -ECONNRESET) {
 
         /* some faults are allowed, not required */
         if (subcase->expected > 0 && (
               ((status == -subcase->expected    /* happened */
                || status == 0))))           /* didn't */
             status = 0;
         /* sometimes more than one fault is allowed */
         else if (subcase->number == 12 && status == -EPIPE)
             status = 0;
         else
             ERROR(ctx->dev, "subtest %d error, status %d\n",
                     subcase->number, status);
     }
 
     /* unexpected status codes mean errors; ideally, in hardware */
     if (status) {
 error:
         if (ctx->status == 0) {
             int     i;
 
             ctx->status = status;
             ERROR(ctx->dev, "control queue %02x.%02x, err %d, "
                     "%d left, subcase %d, len %d/%d\n",
                     reqp->bRequestType, reqp->bRequest,
                     status, ctx->count, subcase->number,
                     urb->actual_length,
                     urb->transfer_buffer_length);
 
             /* FIXME this "unlink everything" exit route should
              * be a separate test case.
              */
 
             /* unlink whatever's still pending */
             for (i = 1; i < ctx->param->sglen; i++) {
                 struct urb *u = ctx->urb[
                             (i + subcase->number)
                             % ctx->param->sglen];
 
                 if (u == urb || !u->dev)
                     continue;
                 spin_unlock(&ctx->lock);
                 status = usb_unlink_urb(u);
                 spin_lock(&ctx->lock);
                 switch (status) {
                 case -EINPROGRESS:
                 case -EBUSY:
                 case -EIDRM:
                     continue;
                 default:
                     ERROR(ctx->dev, "urb unlink --> %d\n",
                             status);
                 }
             }
             status = ctx->status;
         }
     }
 
     /* resubmit if we need to, else mark this as done */
     if ((status == 0) && (ctx->pending < ctx->count)) {
         status = usb_submit_urb(urb, GFP_ATOMIC);
         if (status != 0) {
             ERROR(ctx->dev,
                 "can't resubmit ctrl %02x.%02x, err %d\n",
                 reqp->bRequestType, reqp->bRequest, status);
             urb->dev = NULL;
         } else
             ctx->pending++;
     } else
         urb->dev = NULL;
 
     /* signal completion when nothing's queued */
     if (ctx->pending == 0)
         complete(&ctx->complete);
     spin_unlock_irqrestore(&ctx->lock, flags);
 }
 
 static int
 test_ctrl_queue(struct usbtest_dev *dev, struct usbtest_param_32 *param)
 {
     struct usb_device   *udev = testdev_to_usbdev(dev);
     struct urb      **urb;
     struct ctrl_ctx     context;
     int         i;
 
     if (param->sglen == 0 || param->iterations > UINT_MAX / param->sglen)
         return -EOPNOTSUPP;
 
     spin_lock_init(&context.lock);
     context.dev = dev;
     init_completion(&context.complete);
     context.count = param->sglen * param->iterations;
     context.pending = 0;
     context.status = -ENOMEM;
     context.param = param;
     context.last = -1;
 
     /* allocate and init the urbs we'll queue.
      * as with bulk/intr sglists, sglen is the queue depth; it also
      * controls which subtests run (more tests than sglen) or rerun.
      */
     urb = kcalloc(param->sglen, sizeof(struct urb *), GFP_KERNEL);
     if (!urb)
         return -ENOMEM;
     for (i = 0; i < param->sglen; i++) {
         int         pipe = usb_rcvctrlpipe(udev, 0);
         unsigned        len;
         struct urb      *u;
         struct usb_ctrlrequest  req;
         struct subcase      *reqp;
 
         /* sign of this variable means:
          *  -: tested code must return this (negative) error code
          *  +: tested code may return this (negative too) error code
          */
         int         expected = 0;
 
         /* requests here are mostly expected to succeed on any
          * device, but some are chosen to trigger protocol stalls
          * or short reads.
          */
         memset(&req, 0, sizeof(req));
         req.bRequest = USB_REQ_GET_DESCRIPTOR;
         req.bRequestType = USB_DIR_IN|USB_RECIP_DEVICE;
 
         switch (i % NUM_SUBCASES) {
         case 0:     /* get device descriptor */
             req.wValue = cpu_to_le16(USB_DT_DEVICE << 8);
             len = sizeof(struct usb_device_descriptor);
             break;
         case 1:     /* get first config descriptor (only) */
             req.wValue = cpu_to_le16((USB_DT_CONFIG << 8) | 0);
             len = sizeof(struct usb_config_descriptor);
             break;
         case 2:     /* get altsetting (OFTEN STALLS) */
             req.bRequest = USB_REQ_GET_INTERFACE;
             req.bRequestType = USB_DIR_IN|USB_RECIP_INTERFACE;
             /* index = 0 means first interface */
             len = 1;
             expected = EPIPE;
             break;
         case 3:     /* get interface status */
             req.bRequest = USB_REQ_GET_STATUS;
             req.bRequestType = USB_DIR_IN|USB_RECIP_INTERFACE;
             /* interface 0 */
             len = 2;
             break;
         case 4:     /* get device status */
             req.bRequest = USB_REQ_GET_STATUS;
             req.bRequestType = USB_DIR_IN|USB_RECIP_DEVICE;
             len = 2;
             break;
         case 5:     /* get device qualifier (MAY STALL) */
             req.wValue = cpu_to_le16 (USB_DT_DEVICE_QUALIFIER << 8);
             len = sizeof(struct usb_qualifier_descriptor);
             if (udev->speed != USB_SPEED_HIGH)
                 expected = EPIPE;
             break;
         case 6:     /* get first config descriptor, plus interface */
             req.wValue = cpu_to_le16((USB_DT_CONFIG << 8) | 0);
             len = sizeof(struct usb_config_descriptor);
             len += sizeof(struct usb_interface_descriptor);
             break;
         case 7:     /* get interface descriptor (ALWAYS STALLS) */
             req.wValue = cpu_to_le16 (USB_DT_INTERFACE << 8);
             /* interface == 0 */
             len = sizeof(struct usb_interface_descriptor);
             expected = -EPIPE;
             break;
         /* NOTE: two consecutive stalls in the queue here.
          *  that tests fault recovery a bit more aggressively. */
         case 8:     /* clear endpoint halt (MAY STALL) */
             req.bRequest = USB_REQ_CLEAR_FEATURE;
             req.bRequestType = USB_RECIP_ENDPOINT;
             /* wValue 0 == ep halt */
             /* wIndex 0 == ep0 (shouldn't halt!) */
             len = 0;
             pipe = usb_sndctrlpipe(udev, 0);
             expected = EPIPE;
             break;
         case 9:     /* get endpoint status */
             req.bRequest = USB_REQ_GET_STATUS;
             req.bRequestType = USB_DIR_IN|USB_RECIP_ENDPOINT;
             /* endpoint 0 */
             len = 2;
             break;
         case 10:    /* trigger short read (EREMOTEIO) */
             req.wValue = cpu_to_le16((USB_DT_CONFIG << 8) | 0);
             len = 1024;
             expected = -EREMOTEIO;
             break;
         /* NOTE: two consecutive _different_ faults in the queue. */
         case 11:    /* get endpoint descriptor (ALWAYS STALLS) */
             req.wValue = cpu_to_le16(USB_DT_ENDPOINT << 8);
             /* endpoint == 0 */
             len = sizeof(struct usb_interface_descriptor);
             expected = EPIPE;
             break;
         /* NOTE: sometimes even a third fault in the queue! */
         case 12:    /* get string 0 descriptor (MAY STALL) */
             req.wValue = cpu_to_le16(USB_DT_STRING << 8);
             /* string == 0, for language IDs */
             len = sizeof(struct usb_interface_descriptor);
             /* may succeed when > 4 languages */
             expected = EREMOTEIO;   /* or EPIPE, if no strings */
             break;
         case 13:    /* short read, resembling case 10 */
             req.wValue = cpu_to_le16((USB_DT_CONFIG << 8) | 0);
             /* last data packet "should" be DATA1, not DATA0 */
             if (udev->speed == USB_SPEED_SUPER)
                 len = 1024 - 512;
             else
                 len = 1024 - udev->descriptor.bMaxPacketSize0;
             expected = -EREMOTEIO;
             break;
         case 14:    /* short read; try to fill the last packet */
             req.wValue = cpu_to_le16((USB_DT_DEVICE << 8) | 0);
             /* device descriptor size == 18 bytes */
             len = udev->descriptor.bMaxPacketSize0;
             if (udev->speed == USB_SPEED_SUPER)
                 len = 512;
             switch (len) {
             case 8:
                 len = 24;
                 break;
             case 16:
                 len = 32;
                 break;
             }
             expected = -EREMOTEIO;
             break;
         case 15:
             req.wValue = cpu_to_le16(USB_DT_BOS << 8);
             if (udev->bos)
                 len = le16_to_cpu(udev->bos->desc->wTotalLength);
             else
                 len = sizeof(struct usb_bos_descriptor);
             if (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0201)
                 expected = -EPIPE;
             break;
         default:
             ERROR(dev, "bogus number of ctrl queue testcases!\n");
             context.status = -EINVAL;
             goto cleanup;
         }
         req.wLength = cpu_to_le16(len);
         urb[i] = u = simple_alloc_urb(udev, pipe, len, 0);
         if (!u)
             goto cleanup;
 
         reqp = kmalloc(sizeof(*reqp), GFP_KERNEL);
         if (!reqp)
             goto cleanup;
         reqp->setup = req;
         reqp->number = i % NUM_SUBCASES;
         reqp->expected = expected;
         u->setup_packet = (char *) &reqp->setup;
 
         u->context = &context;
         u->complete = ctrl_complete;
     }
 
     /* queue the urbs */
     context.urb = urb;
     spin_lock_irq(&context.lock);
     for (i = 0; i < param->sglen; i++) {
         context.status = usb_submit_urb(urb[i], GFP_ATOMIC);
         if (context.status != 0) {
             ERROR(dev, "can't submit urb[%d], status %d\n",
                     i, context.status);
             context.count = context.pending;
             break;
         }
         context.pending++;
     }
     spin_unlock_irq(&context.lock);
 
     /* FIXME  set timer and time out; provide a disconnect hook */
 
     /* wait for the last one to complete */
     if (context.pending > 0)
         wait_for_completion(&context.complete);
 
 cleanup:
     for (i = 0; i < param->sglen; i++) {
         if (!urb[i])
             continue;
         urb[i]->dev = udev;
         kfree(urb[i]->setup_packet);
         simple_free_urb(urb[i]);
     }
     kfree(urb);
     return context.status;
 }
 #undef NUM_SUBCASES
 
 
 /*-------------------------------------------------------------------------*/
 
 static void unlink1_callback(struct urb *urb)
 {
     int status = urb->status;
 
     /* we "know" -EPIPE (stall) never happens */
     if (!status)
         status = usb_submit_urb(urb, GFP_ATOMIC);
     if (status) {
         urb->status = status;
         complete(urb->context);
     }
 }
 
 static int unlink1(struct usbtest_dev *dev, int pipe, int size, int async)
 {
     struct urb      *urb;
     struct completion   completion;
     int         retval = 0;
 
     init_completion(&completion);
     urb = simple_alloc_urb(testdev_to_usbdev(dev), pipe, size, 0);
     if (!urb)
         return -ENOMEM;
     urb->context = &completion;
     urb->complete = unlink1_callback;
 
     if (usb_pipeout(urb->pipe)) {
         simple_fill_buf(urb);
         urb->transfer_flags |= URB_ZERO_PACKET;
     }
 
     /* keep the endpoint busy.  there are lots of hc/hcd-internal
      * states, and testing should get to all of them over time.
      *
      * FIXME want additional tests for when endpoint is STALLing
      * due to errors, or is just NAKing requests.
      */
     retval = usb_submit_urb(urb, GFP_KERNEL);
     if (retval != 0) {
         dev_err(&dev->intf->dev, "submit fail %d\n", retval);
         return retval;
     }
 
     /* unlinking that should always work.  variable delay tests more
      * hcd states and code paths, even with little other system load.
      */
     msleep(jiffies % (2 * INTERRUPT_RATE));
     if (async) {
         while (!completion_done(&completion)) {
             retval = usb_unlink_urb(urb);
 
             if (retval == 0 && usb_pipein(urb->pipe))
                 retval = simple_check_buf(dev, urb);
 
             switch (retval) {
             case -EBUSY:
             case -EIDRM:
                 /* we can't unlink urbs while they're completing
                  * or if they've completed, and we haven't
                  * resubmitted. "normal" drivers would prevent
                  * resubmission, but since we're testing unlink
                  * paths, we can't.
                  */
                 ERROR(dev, "unlink retry\n");
                 continue;
             case 0:
             case -EINPROGRESS:
                 break;
 
             default:
                 dev_err(&dev->intf->dev,
                     "unlink fail %d\n", retval);
                 return retval;
             }
 
             break;
         }
     } else
         usb_kill_urb(urb);
 
     wait_for_completion(&completion);
     retval = urb->status;
     simple_free_urb(urb);
 
     if (async)
         return (retval == -ECONNRESET) ? 0 : retval - 1000;
     else
         return (retval == -ENOENT || retval == -EPERM) ?
                 0 : retval - 2000;
 }
 
 static int unlink_simple(struct usbtest_dev *dev, int pipe, int len)
 {
     int         retval = 0;
 
     /* test sync and async paths */
     retval = unlink1(dev, pipe, len, 1);
     if (!retval)
         retval = unlink1(dev, pipe, len, 0);
     return retval;
 }
 
 /*-------------------------------------------------------------------------*/
 
 struct queued_ctx {
     struct completion   complete;
     atomic_t        pending;
     unsigned        num;
     int         status;
     struct urb      **urbs;
 };
 
 static void unlink_queued_callback(struct urb *urb)
 {
     int         status = urb->status;
     struct queued_ctx   *ctx = urb->context;
 
     if (ctx->status)
         goto done;
     if (urb == ctx->urbs[ctx->num - 4] || urb == ctx->urbs[ctx->num - 2]) {
         if (status == -ECONNRESET)
             goto done;
         /* What error should we report if the URB completed normally? */
     }
     if (status != 0)
         ctx->status = status;
 
  done:
     if (atomic_dec_and_test(&ctx->pending))
         complete(&ctx->complete);
 }
 
 static int unlink_queued(struct usbtest_dev *dev, int pipe, unsigned num,
         unsigned size)
 {
     struct queued_ctx   ctx;
     struct usb_device   *udev = testdev_to_usbdev(dev);
     void            *buf;
     dma_addr_t      buf_dma;
     int         i;
     int         retval = -ENOMEM;
 
     init_completion(&ctx.complete);
     atomic_set(&ctx.pending, 1);    /* One more than the actual value */
     ctx.num = num;
     ctx.status = 0;
 
     buf = usb_alloc_coherent(udev, size, GFP_KERNEL, &buf_dma);
     if (!buf)
         return retval;
     memset(buf, 0, size);
 
     /* Allocate and init the urbs we'll queue */
     ctx.urbs = kcalloc(num, sizeof(struct urb *), GFP_KERNEL);
     if (!ctx.urbs)
         goto free_buf;
     for (i = 0; i < num; i++) {
         ctx.urbs[i] = usb_alloc_urb(0, GFP_KERNEL);
         if (!ctx.urbs[i])
             goto free_urbs;
         usb_fill_bulk_urb(ctx.urbs[i], udev, pipe, buf, size,
                 unlink_queued_callback, &ctx);
         ctx.urbs[i]->transfer_dma = buf_dma;
         ctx.urbs[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 
         if (usb_pipeout(ctx.urbs[i]->pipe)) {
             simple_fill_buf(ctx.urbs[i]);
             ctx.urbs[i]->transfer_flags |= URB_ZERO_PACKET;
         }
     }
 
     /* Submit all the URBs and then unlink URBs num - 4 and num - 2. */
     for (i = 0; i < num; i++) {
         atomic_inc(&ctx.pending);
         retval = usb_submit_urb(ctx.urbs[i], GFP_KERNEL);
         if (retval != 0) {
             dev_err(&dev->intf->dev, "submit urbs[%d] fail %d\n",
                     i, retval);
             atomic_dec(&ctx.pending);
             ctx.status = retval;
             break;
         }
     }
     if (i == num) {
         usb_unlink_urb(ctx.urbs[num - 4]);
         usb_unlink_urb(ctx.urbs[num - 2]);
     } else {
         while (--i >= 0)
             usb_unlink_urb(ctx.urbs[i]);
     }
 
     if (atomic_dec_and_test(&ctx.pending))      /* The extra count */
         complete(&ctx.complete);
     wait_for_completion(&ctx.complete);
     retval = ctx.status;
 
  free_urbs:
     for (i = 0; i < num; i++)
         usb_free_urb(ctx.urbs[i]);
     kfree(ctx.urbs);
  free_buf:
     usb_free_coherent(udev, size, buf, buf_dma);
     return retval;
 }
 
 /*-------------------------------------------------------------------------*/
 
 static int verify_not_halted(struct usbtest_dev *tdev, int ep, struct urb *urb)
 {
     int retval;
     u16 status;
 
     /* shouldn't look or act halted */
     retval = usb_get_std_status(urb->dev, USB_RECIP_ENDPOINT, ep, &status);
     if (retval < 0) {
         ERROR(tdev, "ep %02x couldn't get no-halt status, %d\n",
                 ep, retval);
         return retval;
     }
     if (status != 0) {
         ERROR(tdev, "ep %02x bogus status: %04x != 0\n", ep, status);
         return -EINVAL;
     }
     retval = simple_io(tdev, urb, 1, 0, 0, __func__);
     if (retval != 0)
         return -EINVAL;
     return 0;
 }
 
 static int verify_halted(struct usbtest_dev *tdev, int ep, struct urb *urb)
 {
     int retval;
     u16 status;
 
     /* should look and act halted */
     retval = usb_get_std_status(urb->dev, USB_RECIP_ENDPOINT, ep, &status);
     if (retval < 0) {
         ERROR(tdev, "ep %02x couldn't get halt status, %d\n",
                 ep, retval);
         return retval;
     }
     if (status != 1) {
         ERROR(tdev, "ep %02x bogus status: %04x != 1\n", ep, status);
         return -EINVAL;
     }
     retval = simple_io(tdev, urb, 1, 0, -EPIPE, __func__);
     if (retval != -EPIPE)
         return -EINVAL;
     retval = simple_io(tdev, urb, 1, 0, -EPIPE, "verify_still_halted");
     if (retval != -EPIPE)
         return -EINVAL;
     return 0;
 }
 
 static int test_halt(struct usbtest_dev *tdev, int ep, struct urb *urb)
 {
     int retval;
 
     /* shouldn't look or act halted now */
     retval = verify_not_halted(tdev, ep, urb);
     if (retval < 0)
         return retval;
 
     /* set halt (protocol test only), verify it worked */
     retval = usb_control_msg(urb->dev, usb_sndctrlpipe(urb->dev, 0),
             USB_REQ_SET_FEATURE, USB_RECIP_ENDPOINT,
             USB_ENDPOINT_HALT, ep,
             NULL, 0, USB_CTRL_SET_TIMEOUT);
     if (retval < 0) {
         ERROR(tdev, "ep %02x couldn't set halt, %d\n", ep, retval);
         return retval;
     }
     retval = verify_halted(tdev, ep, urb);
     if (retval < 0) {
         int ret;
 
         /* clear halt anyways, else further tests will fail */
         ret = usb_clear_halt(urb->dev, urb->pipe);
         if (ret)
             ERROR(tdev, "ep %02x couldn't clear halt, %d\n",
                   ep, ret);
 
         return retval;
     }
 
     /* clear halt (tests API + protocol), verify it worked */
     retval = usb_clear_halt(urb->dev, urb->pipe);
     if (retval < 0) {
         ERROR(tdev, "ep %02x couldn't clear halt, %d\n", ep, retval);
         return retval;
     }
     retval = verify_not_halted(tdev, ep, urb);
     if (retval < 0)
         return retval;
 
     /* NOTE:  could also verify SET_INTERFACE clear halts ... */
 
     return 0;
 }
 
 static int test_toggle_sync(struct usbtest_dev *tdev, int ep, struct urb *urb)
 {
     int retval;
 
     /* clear initial data toggle to DATA0 */
     retval = usb_clear_halt(urb->dev, urb->pipe);
     if (retval < 0) {
         ERROR(tdev, "ep %02x couldn't clear halt, %d\n", ep, retval);
         return retval;
     }
 
     /* transfer 3 data packets, should be DATA0, DATA1, DATA0 */
     retval = simple_io(tdev, urb, 1, 0, 0, __func__);
     if (retval != 0)
         return -EINVAL;
 
     /* clear halt resets device side data toggle, host should react to it */
     retval = usb_clear_halt(urb->dev, urb->pipe);
     if (retval < 0) {
         ERROR(tdev, "ep %02x couldn't clear halt, %d\n", ep, retval);
         return retval;
     }
 
     /* host should use DATA0 again after clear halt */
     retval = simple_io(tdev, urb, 1, 0, 0, __func__);
 
     return retval;
 }
 
 static int halt_simple(struct usbtest_dev *dev)
 {
     int         ep;
     int         retval = 0;
     struct urb      *urb;
     struct usb_device   *udev = testdev_to_usbdev(dev);
 
     if (udev->speed == USB_SPEED_SUPER)
         urb = simple_alloc_urb(udev, 0, 1024, 0);
     else
         urb = simple_alloc_urb(udev, 0, 512, 0);
     if (urb == NULL)
         return -ENOMEM;
 
     if (dev->in_pipe) {
         ep = usb_pipeendpoint(dev->in_pipe) | USB_DIR_IN;
         urb->pipe = dev->in_pipe;
         retval = test_halt(dev, ep, urb);
         if (retval < 0)
             goto done;
     }
 
     if (dev->out_pipe) {
         ep = usb_pipeendpoint(dev->out_pipe);
         urb->pipe = dev->out_pipe;
         retval = test_halt(dev, ep, urb);
     }
 done:
     simple_free_urb(urb);
     return retval;
 }
 
 static int toggle_sync_simple(struct usbtest_dev *dev)
 {
     int         ep;
     int         retval = 0;
     struct urb      *urb;
     struct usb_device   *udev = testdev_to_usbdev(dev);
     unsigned        maxp = get_maxpacket(udev, dev->out_pipe);
 
     /*
      * Create a URB that causes a transfer of uneven amount of data packets
      * This way the clear toggle has an impact on the data toggle sequence.
      * Use 2 maxpacket length packets and one zero packet.
      */
     urb = simple_alloc_urb(udev, 0,  2 * maxp, 0);
     if (urb == NULL)
         return -ENOMEM;
 
     urb->transfer_flags |= URB_ZERO_PACKET;
 
     ep = usb_pipeendpoint(dev->out_pipe);
     urb->pipe = dev->out_pipe;
     retval = test_toggle_sync(dev, ep, urb);
 
     simple_free_urb(urb);
     return retval;
 }
 
 /*-------------------------------------------------------------------------*/
 
 /* Control OUT tests use the vendor control requests from Intel's
  * USB 2.0 compliance test device:  write a buffer, read it back.
  *
  * Intel's spec only _requires_ that it work for one packet, which
  * is pretty weak.   Some HCDs place limits here; most devices will
  * need to be able to handle more than one OUT data packet.  We'll
  * try whatever we're told to try.
  */
 static int ctrl_out(struct usbtest_dev *dev,
         unsigned count, unsigned length, unsigned vary, unsigned offset)
 {
     unsigned        i, j, len;
     int         retval;
     u8          *buf;
     char            *what = "?";
     struct usb_device   *udev;
 
     if (length < 1 || length > 0xffff || vary >= length)
         return -EINVAL;
 
     buf = kmalloc(length + offset, GFP_KERNEL);
     if (!buf)
         return -ENOMEM;
 
     buf += offset;
     udev = testdev_to_usbdev(dev);
     len = length;
     retval = 0;
 
     /* NOTE:  hardware might well act differently if we pushed it
      * with lots back-to-back queued requests.
      */
     for (i = 0; i < count; i++) {
         /* write patterned data */
         for (j = 0; j < len; j++)
             buf[j] = (u8)(i + j);
         retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
                 0x5b, USB_DIR_OUT|USB_TYPE_VENDOR,
                 0, 0, buf, len, USB_CTRL_SET_TIMEOUT);
         if (retval != len) {
             what = "write";
             if (retval >= 0) {
                 ERROR(dev, "ctrl_out, wlen %d (expected %d)\n",
                         retval, len);
                 retval = -EBADMSG;
             }
             break;
         }
 
         /* read it back -- assuming nothing intervened!!  */
         retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
                 0x5c, USB_DIR_IN|USB_TYPE_VENDOR,
                 0, 0, buf, len, USB_CTRL_GET_TIMEOUT);
         if (retval != len) {
             what = "read";
             if (retval >= 0) {
                 ERROR(dev, "ctrl_out, rlen %d (expected %d)\n",
                         retval, len);
                 retval = -EBADMSG;
             }
             break;
         }
 
         /* fail if we can't verify */
         for (j = 0; j < len; j++) {
             if (buf[j] != (u8)(i + j)) {
                 ERROR(dev, "ctrl_out, byte %d is %d not %d\n",
                     j, buf[j], (u8)(i + j));
                 retval = -EBADMSG;
                 break;
             }
         }
         if (retval < 0) {
             what = "verify";
             break;
         }
 
         len += vary;
 
         /* [real world] the "zero bytes IN" case isn't really used.
          * hardware can easily trip up in this weird case, since its
          * status stage is IN, not OUT like other ep0in transfers.
          */
         if (len > length)
             len = realworld ? 1 : 0;
     }
 
     if (retval < 0)
         ERROR(dev, "ctrl_out %s failed, code %d, count %d\n",
             what, retval, i);
 
     kfree(buf - offset);
     return retval;
 }
 
 /*-------------------------------------------------------------------------*/
 
 /* ISO/BULK tests ... mimics common usage
  *  - buffer length is split into N packets (mostly maxpacket sized)
  *  - multi-buffers according to sglen
  */
 
 struct transfer_context {
     unsigned        count;
     unsigned        pending;
     spinlock_t      lock;
     struct completion   done;
     int         submit_error;
     unsigned long       errors;
     unsigned long       packet_count;
     struct usbtest_dev  *dev;
     bool            is_iso;
 };
 
 static void complicated_callback(struct urb *urb)
 {
     struct transfer_context *ctx = urb->context;
     unsigned long flags;
 
     spin_lock_irqsave(&ctx->lock, flags);
     ctx->count--;
 
     ctx->packet_count += urb->number_of_packets;
     if (urb->error_count > 0)
         ctx->errors += urb->error_count;
     else if (urb->status != 0)
         ctx->errors += (ctx->is_iso ? urb->number_of_packets : 1);
     else if (urb->actual_length != urb->transfer_buffer_length)
         ctx->errors++;
     else if (check_guard_bytes(ctx->dev, urb) != 0)
         ctx->errors++;
 
     if (urb->status == 0 && ctx->count > (ctx->pending - 1)
             && !ctx->submit_error) {
         int status = usb_submit_urb(urb, GFP_ATOMIC);
         switch (status) {
         case 0:
             goto done;
         default:
             dev_err(&ctx->dev->intf->dev,
                     "resubmit err %d\n",
                     status);
             fallthrough;
         case -ENODEV:           /* disconnected */
         case -ESHUTDOWN:        /* endpoint disabled */
             ctx->submit_error = 1;
             break;
         }
     }
 
     ctx->pending--;
     if (ctx->pending == 0) {
         if (ctx->errors)
             dev_err(&ctx->dev->intf->dev,
                 "during the test, %lu errors out of %lu\n",
                 ctx->errors, ctx->packet_count);
         complete(&ctx->done);
     }
 done:
     spin_unlock_irqrestore(&ctx->lock, flags);
 }
 
 static struct urb *iso_alloc_urb(
     struct usb_device   *udev,
     int         pipe,
     struct usb_endpoint_descriptor  *desc,
     long            bytes,
     unsigned offset
 )
 {
     struct urb      *urb;
     unsigned        i, maxp, packets;
 
     if (bytes < 0 || !desc)
         return NULL;
 
     maxp = usb_endpoint_maxp(desc);
     if (udev->speed >= USB_SPEED_SUPER)
         maxp *= ss_isoc_get_packet_num(udev, pipe);
     else
         maxp *= usb_endpoint_maxp_mult(desc);
 
     packets = DIV_ROUND_UP(bytes, maxp);
 
     urb = usb_alloc_urb(packets, GFP_KERNEL);
     if (!urb)
         return urb;
     urb->dev = udev;
     urb->pipe = pipe;
 
     urb->number_of_packets = packets;
     urb->transfer_buffer_length = bytes;
     urb->transfer_buffer = usb_alloc_coherent(udev, bytes + offset,
                             GFP_KERNEL,
                             &urb->transfer_dma);
     if (!urb->transfer_buffer) {
         usb_free_urb(urb);
         return NULL;
     }
     if (offset) {
         memset(urb->transfer_buffer, GUARD_BYTE, offset);
         urb->transfer_buffer += offset;
         urb->transfer_dma += offset;
     }
     /* For inbound transfers use guard byte so that test fails if
         data not correctly copied */
     memset(urb->transfer_buffer,
             usb_pipein(urb->pipe) ? GUARD_BYTE : 0,
             bytes);
 
     for (i = 0; i < packets; i++) {
         /* here, only the last packet will be short */
         urb->iso_frame_desc[i].length = min((unsigned) bytes, maxp);
         bytes -= urb->iso_frame_desc[i].length;
 
         urb->iso_frame_desc[i].offset = maxp * i;
     }
 
     urb->complete = complicated_callback;
     /* urb->context = SET BY CALLER */
     urb->interval = 1 << (desc->bInterval - 1);
     urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
     return urb;
 }
 
 static int
 test_queue(struct usbtest_dev *dev, struct usbtest_param_32 *param,
         int pipe, struct usb_endpoint_descriptor *desc, unsigned offset)
 {
     struct transfer_context context;
     struct usb_device   *udev;
     unsigned        i;
     unsigned long       packets = 0;
     int         status = 0;
     struct urb      **urbs;
 
     if (!param->sglen || param->iterations > UINT_MAX / param->sglen)
         return -EINVAL;
 
     if (param->sglen > MAX_SGLEN)
         return -EINVAL;
 
     urbs = kcalloc(param->sglen, sizeof(*urbs), GFP_KERNEL);
     if (!urbs)
         return -ENOMEM;
 
     memset(&context, 0, sizeof(context));
     context.count = param->iterations * param->sglen;
     context.dev = dev;
     context.is_iso = !!desc;
     init_completion(&context.done);
     spin_lock_init(&context.lock);
 
     udev = testdev_to_usbdev(dev);
 
     for (i = 0; i < param->sglen; i++) {
         if (context.is_iso)
             urbs[i] = iso_alloc_urb(udev, pipe, desc,
                     param->length, offset);
         else
             urbs[i] = complicated_alloc_urb(udev, pipe,
                     param->length, 0);
 
         if (!urbs[i]) {
             status = -ENOMEM;
             goto fail;
         }
         packets += urbs[i]->number_of_packets;
         urbs[i]->context = &context;
     }
     packets *= param->iterations;
 
     if (context.is_iso) {
         int transaction_num;
 
         if (udev->speed >= USB_SPEED_SUPER)
             transaction_num = ss_isoc_get_packet_num(udev, pipe);
         else
             transaction_num = usb_endpoint_maxp_mult(desc);
 
         dev_info(&dev->intf->dev,
             "iso period %d %sframes, wMaxPacket %d, transactions: %d\n",
             1 << (desc->bInterval - 1),
             (udev->speed >= USB_SPEED_HIGH) ? "micro" : "",
             usb_endpoint_maxp(desc),
             transaction_num);
 
         dev_info(&dev->intf->dev,
             "total %lu msec (%lu packets)\n",
             (packets * (1 << (desc->bInterval - 1)))
                 / ((udev->speed >= USB_SPEED_HIGH) ? 8 : 1),
             packets);
     }
 
     spin_lock_irq(&context.lock);
     for (i = 0; i < param->sglen; i++) {
         ++context.pending;
         status = usb_submit_urb(urbs[i], GFP_ATOMIC);
         if (status < 0) {
             ERROR(dev, "submit iso[%d], error %d\n", i, status);
             if (i == 0) {
                 spin_unlock_irq(&context.lock);
                 goto fail;
             }
 
             simple_free_urb(urbs[i]);
             urbs[i] = NULL;
             context.pending--;
             context.submit_error = 1;
             break;
         }
     }
     spin_unlock_irq(&context.lock);
 
     wait_for_completion(&context.done);
 
     for (i = 0; i < param->sglen; i++) {
         if (urbs[i])
             simple_free_urb(urbs[i]);
     }
     /*
      * Isochronous transfers are expected to fail sometimes.  As an
      * arbitrary limit, we will report an error if any submissions
      * fail or if the transfer failure rate is > 10%.
      */
     if (status != 0)
         ;
     else if (context.submit_error)
         status = -EACCES;
     else if (context.errors >
             (context.is_iso ? context.packet_count / 10 : 0))
         status = -EIO;
 
     kfree(urbs);
     return status;
 
 fail:
     for (i = 0; i < param->sglen; i++) {
         if (urbs[i])
             simple_free_urb(urbs[i]);
     }
 
     kfree(urbs);
     return status;
 }
 
 static int test_unaligned_bulk(
     struct usbtest_dev *tdev,
     int pipe,
     unsigned length,
     int iterations,
     unsigned transfer_flags,
     const char *label)
 {
     int retval;
     struct urb *urb = usbtest_alloc_urb(testdev_to_usbdev(tdev),
             pipe, length, transfer_flags, 1, 0, simple_callback);
 
     if (!urb)
         return -ENOMEM;
 
     retval = simple_io(tdev, urb, iterations, 0, 0, label);
     simple_free_urb(urb);
     return retval;
 }
 
 /* Run tests. */
 static int
 usbtest_do_ioctl(struct usb_interface *intf, struct usbtest_param_32 *param)
 {
     struct usbtest_dev  *dev = usb_get_intfdata(intf);
     struct usb_device   *udev = testdev_to_usbdev(dev);
     struct urb      *urb;
     struct scatterlist  *sg;
     struct usb_sg_request   req;
     unsigned        i;
     int retval = -EOPNOTSUPP;
 
     if (param->iterations <= 0)
         return -EINVAL;
     if (param->sglen > MAX_SGLEN)
         return -EINVAL;
     /*
      * Just a bunch of test cases that every HCD is expected to handle.
      *
      * Some may need specific firmware, though it'd be good to have
      * one firmware image to handle all the test cases.
      *
      * FIXME add more tests!  cancel requests, verify the data, control
      * queueing, concurrent read+write threads, and so on.
      */
     switch (param->test_num) {
 
     case 0:
         dev_info(&intf->dev, "TEST 0:  NOP\n");
         retval = 0;
         break;
 
     /* Simple non-queued bulk I/O tests */
     case 1:
         if (dev->out_pipe == 0)
             break;
         dev_info(&intf->dev,
                 "TEST 1:  write %d bytes %u times\n",
                 param->length, param->iterations);
         urb = simple_alloc_urb(udev, dev->out_pipe, param->length, 0);
         if (!urb) {
             retval = -ENOMEM;
             break;
         }
         /* FIRMWARE:  bulk sink (maybe accepts short writes) */
         retval = simple_io(dev, urb, param->iterations, 0, 0, "test1");
         simple_free_urb(urb);
         break;
     case 2:
         if (dev->in_pipe == 0)
             break;
         dev_info(&intf->dev,
                 "TEST 2:  read %d bytes %u times\n",
                 param->length, param->iterations);
         urb = simple_alloc_urb(udev, dev->in_pipe, param->length, 0);
         if (!urb) {
             retval = -ENOMEM;
             break;
         }
         /* FIRMWARE:  bulk source (maybe generates short writes) */
         retval = simple_io(dev, urb, param->iterations, 0, 0, "test2");
         simple_free_urb(urb);
         break;
     case 3:
         if (dev->out_pipe == 0 || param->vary == 0)
             break;
         dev_info(&intf->dev,
                 "TEST 3:  write/%d 0..%d bytes %u times\n",
                 param->vary, param->length, param->iterations);
         urb = simple_alloc_urb(udev, dev->out_pipe, param->length, 0);
         if (!urb) {
             retval = -ENOMEM;
             break;
         }
         /* FIRMWARE:  bulk sink (maybe accepts short writes) */
         retval = simple_io(dev, urb, param->iterations, param->vary,
                     0, "test3");
         simple_free_urb(urb);
         break;
     case 4:
         if (dev->in_pipe == 0 || param->vary == 0)
             break;
         dev_info(&intf->dev,
                 "TEST 4:  read/%d 0..%d bytes %u times\n",
                 param->vary, param->length, param->iterations);
         urb = simple_alloc_urb(udev, dev->in_pipe, param->length, 0);
         if (!urb) {
             retval = -ENOMEM;
             break;
         }
         /* FIRMWARE:  bulk source (maybe generates short writes) */
         retval = simple_io(dev, urb, param->iterations, param->vary,
                     0, "test4");
         simple_free_urb(urb);
         break;
 
     /* Queued bulk I/O tests */
     case 5:
         if (dev->out_pipe == 0 || param->sglen == 0)
             break;
         dev_info(&intf->dev,
             "TEST 5:  write %d sglists %d entries of %d bytes\n",
                 param->iterations,
                 param->sglen, param->length);
         sg = alloc_sglist(param->sglen, param->length,
                 0, dev, dev->out_pipe);
         if (!sg) {
             retval = -ENOMEM;
             break;
         }
         /* FIRMWARE:  bulk sink (maybe accepts short writes) */
         retval = perform_sglist(dev, param->iterations, dev->out_pipe,
                 &req, sg, param->sglen);
         free_sglist(sg, param->sglen);
         break;
 
     case 6:
         if (dev->in_pipe == 0 || param->sglen == 0)
             break;
         dev_info(&intf->dev,
             "TEST 6:  read %d sglists %d entries of %d bytes\n",
                 param->iterations,
                 param->sglen, param->length);
         sg = alloc_sglist(param->sglen, param->length,
                 0, dev, dev->in_pipe);
         if (!sg) {
             retval = -ENOMEM;
             break;
         }
         /* FIRMWARE:  bulk source (maybe generates short writes) */
         retval = perform_sglist(dev, param->iterations, dev->in_pipe,
                 &req, sg, param->sglen);
         free_sglist(sg, param->sglen);
         break;
     case 7:
         if (dev->out_pipe == 0 || param->sglen == 0 || param->vary == 0)
             break;
         dev_info(&intf->dev,
             "TEST 7:  write/%d %d sglists %d entries 0..%d bytes\n",
                 param->vary, param->iterations,
                 param->sglen, param->length);
         sg = alloc_sglist(param->sglen, param->length,
                 param->vary, dev, dev->out_pipe);
         if (!sg) {
             retval = -ENOMEM;
             break;
         }
         /* FIRMWARE:  bulk sink (maybe accepts short writes) */
         retval = perform_sglist(dev, param->iterations, dev->out_pipe,
                 &req, sg, param->sglen);
         free_sglist(sg, param->sglen);
         break;
     case 8:
         if (dev->in_pipe == 0 || param->sglen == 0 || param->vary == 0)
             break;
         dev_info(&intf->dev,
             "TEST 8:  read/%d %d sglists %d entries 0..%d bytes\n",
                 param->vary, param->iterations,
                 param->sglen, param->length);
         sg = alloc_sglist(param->sglen, param->length,
                 param->vary, dev, dev->in_pipe);
         if (!sg) {
             retval = -ENOMEM;
             break;
         }
         /* FIRMWARE:  bulk source (maybe generates short writes) */
         retval = perform_sglist(dev, param->iterations, dev->in_pipe,
                 &req, sg, param->sglen);
         free_sglist(sg, param->sglen);
         break;
 
     /* non-queued sanity tests for control (chapter 9 subset) */
     case 9:
         retval = 0;
         dev_info(&intf->dev,
             "TEST 9:  ch9 (subset) control tests, %d times\n",
                 param->iterations);
         for (i = param->iterations; retval == 0 && i--; /* NOP */)
             retval = ch9_postconfig(dev);
         if (retval)
             dev_err(&intf->dev, "ch9 subset failed, "
                     "iterations left %d\n", i);
         break;
 
     /* queued control messaging */
     case 10:
         retval = 0;
         dev_info(&intf->dev,
                 "TEST 10:  queue %d control calls, %d times\n",
                 param->sglen,
                 param->iterations);
         retval = test_ctrl_queue(dev, param);
         break;
 
     /* simple non-queued unlinks (ring with one urb) */
     case 11:
         if (dev->in_pipe == 0 || !param->length)
             break;
         retval = 0;
         dev_info(&intf->dev, "TEST 11:  unlink %d reads of %d\n",
                 param->iterations, param->length);
         for (i = param->iterations; retval == 0 && i--; /* NOP */)
             retval = unlink_simple(dev, dev->in_pipe,
                         param->length);
         if (retval)
             dev_err(&intf->dev, "unlink reads failed %d, "
                 "iterations left %d\n", retval, i);
         break;
     case 12:
         if (dev->out_pipe == 0 || !param->length)
             break;
         retval = 0;
         dev_info(&intf->dev, "TEST 12:  unlink %d writes of %d\n",
                 param->iterations, param->length);
         for (i = param->iterations; retval == 0 && i--; /* NOP */)
             retval = unlink_simple(dev, dev->out_pipe,
                         param->length);
         if (retval)
             dev_err(&intf->dev, "unlink writes failed %d, "
                 "iterations left %d\n", retval, i);
         break;
 
     /* ep halt tests */
     case 13:
         if (dev->out_pipe == 0 && dev->in_pipe == 0)
             break;
         retval = 0;
         dev_info(&intf->dev, "TEST 13:  set/clear %d halts\n",
                 param->iterations);
         for (i = param->iterations; retval == 0 && i--; /* NOP */)
             retval = halt_simple(dev);
 
         if (retval)
             ERROR(dev, "halts failed, iterations left %d\n", i);
         break;
 
     /* control write tests */
     case 14:
         if (!dev->info->ctrl_out)
             break;
         dev_info(&intf->dev, "TEST 14:  %d ep0out, %d..%d vary %d\n",
                 param->iterations,
                 realworld ? 1 : 0, param->length,
                 param->vary);
         retval = ctrl_out(dev, param->iterations,
                 param->length, param->vary, 0);
         break;
 
     /* iso write tests */
     case 15:
         if (dev->out_iso_pipe == 0 || param->sglen == 0)
             break;
         dev_info(&intf->dev,
             "TEST 15:  write %d iso, %d entries of %d bytes\n",
                 param->iterations,
                 param->sglen, param->length);
         /* FIRMWARE:  iso sink */
         retval = test_queue(dev, param,
                 dev->out_iso_pipe, dev->iso_out, 0);
         break;
 
     /* iso read tests */
     case 16:
         if (dev->in_iso_pipe == 0 || param->sglen == 0)
             break;
         dev_info(&intf->dev,
             "TEST 16:  read %d iso, %d entries of %d bytes\n",
                 param->iterations,
                 param->sglen, param->length);
         /* FIRMWARE:  iso source */
         retval = test_queue(dev, param,
                 dev->in_iso_pipe, dev->iso_in, 0);
         break;
 
     /* FIXME scatterlist cancel (needs helper thread) */
 
     /* Tests for bulk I/O using DMA mapping by core and odd address */
     case 17:
         if (dev->out_pipe == 0)
             break;
         dev_info(&intf->dev,
             "TEST 17:  write odd addr %d bytes %u times core map\n",
             param->length, param->iterations);
 
         retval = test_unaligned_bulk(
                 dev, dev->out_pipe,
                 param->length, param->iterations,
                 0, "test17");
         break;
 
     case 18:
         if (dev->in_pipe == 0)
             break;
         dev_info(&intf->dev,
             "TEST 18:  read odd addr %d bytes %u times core map\n",
             param->length, param->iterations);
 
         retval = test_unaligned_bulk(
                 dev, dev->in_pipe,
                 param->length, param->iterations,
                 0, "test18");
         break;
 
     /* Tests for bulk I/O using premapped coherent buffer and odd address */
     case 19:
         if (dev->out_pipe == 0)
             break;
         dev_info(&intf->dev,
             "TEST 19:  write odd addr %d bytes %u times premapped\n",
             param->length, param->iterations);
 
         retval = test_unaligned_bulk(
                 dev, dev->out_pipe,
                 param->length, param->iterations,
                 URB_NO_TRANSFER_DMA_MAP, "test19");
         break;
 
     case 20:
         if (dev->in_pipe == 0)
             break;
         dev_info(&intf->dev,
             "TEST 20:  read odd addr %d bytes %u times premapped\n",
             param->length, param->iterations);
 
         retval = test_unaligned_bulk(
                 dev, dev->in_pipe,
                 param->length, param->iterations,
                 URB_NO_TRANSFER_DMA_MAP, "test20");
         break;
 
     /* control write tests with unaligned buffer */
     case 21:
         if (!dev->info->ctrl_out)
             break;
         dev_info(&intf->dev,
                 "TEST 21:  %d ep0out odd addr, %d..%d vary %d\n",
                 param->iterations,
                 realworld ? 1 : 0, param->length,
                 param->vary);
         retval = ctrl_out(dev, param->iterations,
                 param->length, param->vary, 1);
         break;
 
     /* unaligned iso tests */
     case 22:
         if (dev->out_iso_pipe == 0 || param->sglen == 0)
             break;
         dev_info(&intf->dev,
             "TEST 22:  write %d iso odd, %d entries of %d bytes\n",
                 param->iterations,
                 param->sglen, param->length);
         retval = test_queue(dev, param,
                 dev->out_iso_pipe, dev->iso_out, 1);
         break;
 
     case 23:
         if (dev->in_iso_pipe == 0 || param->sglen == 0)
             break;
         dev_info(&intf->dev,
             "TEST 23:  read %d iso odd, %d entries of %d bytes\n",
                 param->iterations,
                 param->sglen, param->length);
         retval = test_queue(dev, param,
                 dev->in_iso_pipe, dev->iso_in, 1);
         break;
 
     /* unlink URBs from a bulk-OUT queue */
     case 24:
         if (dev->out_pipe == 0 || !param->length || param->sglen < 4)
             break;
         retval = 0;
         dev_info(&intf->dev, "TEST 24:  unlink from %d queues of "
                 "%d %d-byte writes\n",
                 param->iterations, param->sglen, param->length);
         for (i = param->iterations; retval == 0 && i > 0; --i) {
             retval = unlink_queued(dev, dev->out_pipe,
                         param->sglen, param->length);
             if (retval) {
                 dev_err(&intf->dev,
                     "unlink queued writes failed %d, "
                     "iterations left %d\n", retval, i);
                 break;
             }
         }
         break;
 
     /* Simple non-queued interrupt I/O tests */
     case 25:
         if (dev->out_int_pipe == 0)
             break;
         dev_info(&intf->dev,
                 "TEST 25: write %d bytes %u times\n",
                 param->length, param->iterations);
         urb = simple_alloc_urb(udev, dev->out_int_pipe, param->length,
                 dev->int_out->bInterval);
         if (!urb) {
             retval = -ENOMEM;
             break;
         }
         /* FIRMWARE: interrupt sink (maybe accepts short writes) */
         retval = simple_io(dev, urb, param->iterations, 0, 0, "test25");
         simple_free_urb(urb);
         break;
     case 26:
         if (dev->in_int_pipe == 0)
             break;
         dev_info(&intf->dev,
                 "TEST 26: read %d bytes %u times\n",
                 param->length, param->iterations);
         urb = simple_alloc_urb(udev, dev->in_int_pipe, param->length,
                 dev->int_in->bInterval);
         if (!urb) {
             retval = -ENOMEM;
             break;
         }
         /* FIRMWARE: interrupt source (maybe generates short writes) */
         retval = simple_io(dev, urb, param->iterations, 0, 0, "test26");
         simple_free_urb(urb);
         break;
     case 27:
         /* We do performance test, so ignore data compare */
         if (dev->out_pipe == 0 || param->sglen == 0 || pattern != 0)
             break;
         dev_info(&intf->dev,
             "TEST 27: bulk write %dMbytes\n", (param->iterations *
             param->sglen * param->length) / (1024 * 1024));
         retval = test_queue(dev, param,
                 dev->out_pipe, NULL, 0);
         break;
     case 28:
         if (dev->in_pipe == 0 || param->sglen == 0 || pattern != 0)
             break;
         dev_info(&intf->dev,
             "TEST 28: bulk read %dMbytes\n", (param->iterations *
             param->sglen * param->length) / (1024 * 1024));
         retval = test_queue(dev, param,
                 dev->in_pipe, NULL, 0);
         break;
     /* Test data Toggle/seq_nr clear between bulk out transfers */
     case 29:
         if (dev->out_pipe == 0)
             break;
         retval = 0;
         dev_info(&intf->dev, "TEST 29: Clear toggle between bulk writes %d times\n",
                 param->iterations);
         for (i = param->iterations; retval == 0 && i > 0; --i)
             retval = toggle_sync_simple(dev);
 
         if (retval)
             ERROR(dev, "toggle sync failed, iterations left %d\n",
                   i);
         break;
     }
     return retval;
 }
 
 /*-------------------------------------------------------------------------*/
 
 /* We only have this one interface to user space, through usbfs.
  * User mode code can scan usbfs to find N different devices (maybe on
  * different busses) to use when testing, and allocate one thread per
  * test.  So discovery is simplified, and we have no device naming issues.
  *
  * Don't use these only as stress/load tests.  Use them along with
  * other USB bus activity:  plugging, unplugging, mousing, mp3 playback,
  * video capture, and so on.  Run different tests at different times, in
  * different sequences.  Nothing here should interact with other devices,
  * except indirectly by consuming USB bandwidth and CPU resources for test
  * threads and request completion.  But the only way to know that for sure
  * is to test when HC queues are in use by many devices.
  *
  * WARNING:  Because usbfs grabs udev->dev.sem before calling this ioctl(),
  * it locks out usbcore in certain code paths.  Notably, if you disconnect
  * the device-under-test, hub_wq will wait block forever waiting for the
  * ioctl to complete ... so that usb_disconnect() can abort the pending
  * urbs and then call usbtest_disconnect().  To abort a test, you're best
  * off just killing the userspace task and waiting for it to exit.
  */
 
 static int
 usbtest_ioctl(struct usb_interface *intf, unsigned int code, void *buf)
 {
 
     struct usbtest_dev  *dev = usb_get_intfdata(intf);
     struct usbtest_param_64 *param_64 = buf;
     struct usbtest_param_32 temp;
     struct usbtest_param_32 *param_32 = buf;
     struct timespec64 start;
     struct timespec64 end;
     struct timespec64 duration;
     int retval = -EOPNOTSUPP;
 
     /* FIXME USBDEVFS_CONNECTINFO doesn't say how fast the device is. */
 
     pattern = mod_pattern;
 
     if (mutex_lock_interruptible(&dev->lock))
         return -ERESTARTSYS;
 
     /* FIXME: What if a system sleep starts while a test is running? */
 
     /* some devices, like ez-usb default devices, need a non-default
      * altsetting to have any active endpoints.  some tests change
      * altsettings; force a default so most tests don't need to check.
      */
     if (dev->info->alt >= 0) {
         if (intf->altsetting->desc.bInterfaceNumber) {
             retval = -ENODEV;
             goto free_mutex;
         }
         retval = set_altsetting(dev, dev->info->alt);
         if (retval) {
             dev_err(&intf->dev,
                     "set altsetting to %d failed, %d\n",
                     dev->info->alt, retval);
             goto free_mutex;
         }
     }
 
     switch (code) {
     case USBTEST_REQUEST_64:
         temp.test_num = param_64->test_num;
         temp.iterations = param_64->iterations;
         temp.length = param_64->length;
         temp.sglen = param_64->sglen;
         temp.vary = param_64->vary;
         param_32 = &temp;
         break;
 
     case USBTEST_REQUEST_32:
         break;
 
     default:
         retval = -EOPNOTSUPP;
         goto free_mutex;
     }
 
     ktime_get_ts64(&start);
 
     retval = usbtest_do_ioctl(intf, param_32);
     if (retval < 0)
         goto free_mutex;
 
     ktime_get_ts64(&end);
 
     duration = timespec64_sub(end, start);
 
     temp.duration_sec = duration.tv_sec;
     temp.duration_usec = duration.tv_nsec/NSEC_PER_USEC;
 
     switch (code) {
     case USBTEST_REQUEST_32:
         param_32->duration_sec = temp.duration_sec;
         param_32->duration_usec = temp.duration_usec;
         break;
 
     case USBTEST_REQUEST_64:
         param_64->duration_sec = temp.duration_sec;
         param_64->duration_usec = temp.duration_usec;
         break;
     }
 
 free_mutex:
     mutex_unlock(&dev->lock);
     return retval;
 }
 
 /*-------------------------------------------------------------------------*/
 
 static unsigned force_interrupt;
 module_param(force_interrupt, uint, 0);
 MODULE_PARM_DESC(force_interrupt, "0 = test default; else interrupt");
 
 #ifdef  GENERIC
 static unsigned short vendor;
 module_param(vendor, ushort, 0);
 MODULE_PARM_DESC(vendor, "vendor code (from usb-if)");
 
 static unsigned short product;
 module_param(product, ushort, 0);
 MODULE_PARM_DESC(product, "product code (from vendor)");
 #endif
 
 static int
 usbtest_probe(struct usb_interface *intf, const struct usb_device_id *id)
 {
     struct usb_device   *udev;
     struct usbtest_dev  *dev;
     struct usbtest_info *info;
     char            *rtest, *wtest;
     char            *irtest, *iwtest;
     char            *intrtest, *intwtest;
 
     udev = interface_to_usbdev(intf);
 
 #ifdef  GENERIC
     /* specify devices by module parameters? */
     if (id->match_flags == 0) {
         /* vendor match required, product match optional */
         if (!vendor || le16_to_cpu(udev->descriptor.idVendor) != (u16)vendor)
             return -ENODEV;
         if (product && le16_to_cpu(udev->descriptor.idProduct) != (u16)product)
             return -ENODEV;
         dev_info(&intf->dev, "matched module params, "
                     "vend=0x%04x prod=0x%04x\n",
                 le16_to_cpu(udev->descriptor.idVendor),
                 le16_to_cpu(udev->descriptor.idProduct));
     }
 #endif
 
     dev = kzalloc(sizeof(*dev), GFP_KERNEL);
     if (!dev)
         return -ENOMEM;
     info = (struct usbtest_info *) id->driver_info;
     dev->info = info;
     mutex_init(&dev->lock);
 
     dev->intf = intf;
 
     /* cacheline-aligned scratch for i/o */
     dev->buf = kmalloc(TBUF_SIZE, GFP_KERNEL);
     if (dev->buf == NULL) {
         kfree(dev);
         return -ENOMEM;
     }
 
     /* NOTE this doesn't yet test the handful of difference that are
      * visible with high speed interrupts:  bigger maxpacket (1K) and
      * "high bandwidth" modes (up to 3 packets/uframe).
      */
     rtest = wtest = "";
     irtest = iwtest = "";
     intrtest = intwtest = "";
     if (force_interrupt || udev->speed == USB_SPEED_LOW) {
         if (info->ep_in) {
             dev->in_pipe = usb_rcvintpipe(udev, info->ep_in);
             rtest = " intr-in";
         }
         if (info->ep_out) {
             dev->out_pipe = usb_sndintpipe(udev, info->ep_out);
             wtest = " intr-out";
         }
     } else {
         if (override_alt >= 0 || info->autoconf) {
             int status;
 
             status = get_endpoints(dev, intf);
             if (status < 0) {
                 WARNING(dev, "couldn't get endpoints, %d\n",
                         status);
                 kfree(dev->buf);
                 kfree(dev);
                 return status;
             }
             /* may find bulk or ISO pipes */
         } else {
             if (info->ep_in)
                 dev->in_pipe = usb_rcvbulkpipe(udev,
                             info->ep_in);
             if (info->ep_out)
                 dev->out_pipe = usb_sndbulkpipe(udev,
                             info->ep_out);
         }
         if (dev->in_pipe)
             rtest = " bulk-in";
         if (dev->out_pipe)
             wtest = " bulk-out";
         if (dev->in_iso_pipe)
             irtest = " iso-in";
         if (dev->out_iso_pipe)
             iwtest = " iso-out";
         if (dev->in_int_pipe)
             intrtest = " int-in";
         if (dev->out_int_pipe)
             intwtest = " int-out";
     }
 
     usb_set_intfdata(intf, dev);
     dev_info(&intf->dev, "%s\n", info->name);
     dev_info(&intf->dev, "%s {control%s%s%s%s%s%s%s} tests%s\n",
             usb_speed_string(udev->speed),
             info->ctrl_out ? " in/out" : "",
             rtest, wtest,
             irtest, iwtest,
             intrtest, intwtest,
             info->alt >= 0 ? " (+alt)" : "");
     return 0;
 }
 
 static int usbtest_suspend(struct usb_interface *intf, pm_message_t message)
 {
     return 0;
 }
 
 static int usbtest_resume(struct usb_interface *intf)
 {
     return 0;
 }
 
 
 static void usbtest_disconnect(struct usb_interface *intf)
 {
     struct usbtest_dev  *dev = usb_get_intfdata(intf);
 
     usb_set_intfdata(intf, NULL);
     dev_dbg(&intf->dev, "disconnect\n");
     kfree(dev->buf);
     kfree(dev);
 }
 
 /* Basic testing only needs a device that can source or sink bulk traffic.
  * Any device can test control transfers (default with GENERIC binding).
  *
  * Several entries work with the default EP0 implementation that's built
  * into EZ-USB chips.  There's a default vendor ID which can be overridden
  * by (very) small config EEPROMS, but otherwise all these devices act
  * identically until firmware is loaded:  only EP0 works.  It turns out
  * to be easy to make other endpoints work, without modifying that EP0
  * behavior.  For now, we expect that kind of firmware.
  */
 
 /* an21xx or fx versions of ez-usb */
 static struct usbtest_info ez1_info = {
     .name       = "EZ-USB device",
     .ep_in      = 2,
     .ep_out     = 2,
     .alt        = 1,
 };
 
 /* fx2 version of ez-usb */
 static struct usbtest_info ez2_info = {
     .name       = "FX2 device",
     .ep_in      = 6,
     .ep_out     = 2,
     .alt        = 1,
 };
 
 /* ezusb family device with dedicated usb test firmware,
  */
 static struct usbtest_info fw_info = {
     .name       = "usb test device",
     .ep_in      = 2,
     .ep_out     = 2,
     .alt        = 1,
     .autoconf   = 1,        /* iso and ctrl_out need autoconf */
     .ctrl_out   = 1,
     .iso        = 1,        /* iso_ep's are #8 in/out */
 };
 
 /* peripheral running Linux and 'zero.c' test firmware, or
  * its user-mode cousin. different versions of this use
  * different hardware with the same vendor/product codes.
  * host side MUST rely on the endpoint descriptors.
  */
 static struct usbtest_info gz_info = {
     .name       = "Linux gadget zero",
     .autoconf   = 1,
     .ctrl_out   = 1,
     .iso        = 1,
     .intr       = 1,
     .alt        = 0,
 };
 
 static struct usbtest_info um_info = {
     .name       = "Linux user mode test driver",
     .autoconf   = 1,
     .alt        = -1,
 };
 
 static struct usbtest_info um2_info = {
     .name       = "Linux user mode ISO test driver",
     .autoconf   = 1,
     .iso        = 1,
     .alt        = -1,
 };
 
 #ifdef IBOT2
 /* this is a nice source of high speed bulk data;
  * uses an FX2, with firmware provided in the device
  */
 static struct usbtest_info ibot2_info = {
     .name       = "iBOT2 webcam",
     .ep_in      = 2,
     .alt        = -1,
 };
 #endif
 
 #ifdef GENERIC
 /* we can use any device to test control traffic */
 static struct usbtest_info generic_info = {
     .name       = "Generic USB device",
     .alt        = -1,
 };
 #endif
 
 
 static const struct usb_device_id id_table[] = {
 
     /*-------------------------------------------------------------*/
 
     /* EZ-USB devices which download firmware to replace (or in our
      * case augment) the default device implementation.
      */
 
     /* generic EZ-USB FX controller */
     { USB_DEVICE(0x0547, 0x2235),
         .driver_info = (unsigned long) &ez1_info,
     },
 
     /* CY3671 development board with EZ-USB FX */
     { USB_DEVICE(0x0547, 0x0080),
         .driver_info = (unsigned long) &ez1_info,
     },
 
     /* generic EZ-USB FX2 controller (or development board) */
     { USB_DEVICE(0x04b4, 0x8613),
         .driver_info = (unsigned long) &ez2_info,
     },
 
     /* re-enumerated usb test device firmware */
     { USB_DEVICE(0xfff0, 0xfff0),
         .driver_info = (unsigned long) &fw_info,
     },
 
     /* "Gadget Zero" firmware runs under Linux */
     { USB_DEVICE(0x0525, 0xa4a0),
         .driver_info = (unsigned long) &gz_info,
     },
 
     /* so does a user-mode variant */
     { USB_DEVICE(0x0525, 0xa4a4),
         .driver_info = (unsigned long) &um_info,
     },
 
     /* ... and a user-mode variant that talks iso */
     { USB_DEVICE(0x0525, 0xa4a3),
         .driver_info = (unsigned long) &um2_info,
     },
 
 #ifdef KEYSPAN_19Qi
     /* Keyspan 19qi uses an21xx (original EZ-USB) */
     /* this does not coexist with the real Keyspan 19qi driver! */
     { USB_DEVICE(0x06cd, 0x010b),
         .driver_info = (unsigned long) &ez1_info,
     },
 #endif
 
     /*-------------------------------------------------------------*/
 
 #ifdef IBOT2
     /* iBOT2 makes a nice source of high speed bulk-in data */
     /* this does not coexist with a real iBOT2 driver! */
     { USB_DEVICE(0x0b62, 0x0059),
         .driver_info = (unsigned long) &ibot2_info,
     },
 #endif
 
     /*-------------------------------------------------------------*/
 
 #ifdef GENERIC
     /* module params can specify devices to use for control tests */
     { .driver_info = (unsigned long) &generic_info, },
 #endif
 
     /*-------------------------------------------------------------*/
 
     { }
 };
 MODULE_DEVICE_TABLE(usb, id_table);
 
 static struct usb_driver usbtest_driver = {
     .name =     "usbtest",
     .id_table = id_table,
     .probe =    usbtest_probe,
     .unlocked_ioctl = usbtest_ioctl,
     .disconnect =   usbtest_disconnect,
     .suspend =  usbtest_suspend,
     .resume =   usbtest_resume,
 };
 
 /*-------------------------------------------------------------------------*/
 
 static int __init usbtest_init(void)
 {
 #ifdef GENERIC
     if (vendor)
         pr_debug("params: vend=0x%04x prod=0x%04x\n", vendor, product);
 #endif
     return usb_register(&usbtest_driver);
 }
 module_init(usbtest_init);
 
 static void __exit usbtest_exit(void)
 {
     usb_deregister(&usbtest_driver);
 }
 module_exit(usbtest_exit);
 
 MODULE_DESCRIPTION("USB Core/HCD Testing Driver");
 MODULE_LICENSE("GPL");