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

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *  c 2001 PPC 64 Team, IBM Corp
  *
  * /proc/powerpc/rtas/firmware_flash interface
  *
  * This file implements a firmware_flash interface to pump a firmware
  * image into the kernel.  At reboot time rtas_restart() will see the
  * firmware image and flash it as it reboots (see rtas.c).
  */
 
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/proc_fs.h>
 #include <linux/reboot.h>
 #include <asm/delay.h>
 #include <linux/uaccess.h>
 #include <asm/rtas.h>
 
 #define MODULE_VERS "1.0"
 #define MODULE_NAME "rtas_flash"
 
 #define FIRMWARE_FLASH_NAME "firmware_flash"   
 #define FIRMWARE_UPDATE_NAME "firmware_update"
 #define MANAGE_FLASH_NAME "manage_flash"
 #define VALIDATE_FLASH_NAME "validate_flash"
 
 /* General RTAS Status Codes */
 #define RTAS_RC_SUCCESS  0
 #define RTAS_RC_HW_ERR  -1
 #define RTAS_RC_BUSY    -2
 
 /* Flash image status values */
 #define FLASH_AUTH           -9002 /* RTAS Not Service Authority Partition */
 #define FLASH_NO_OP          -1099 /* No operation initiated by user */ 
 #define FLASH_IMG_SHORT      -1005 /* Flash image shorter than expected */
 #define FLASH_IMG_BAD_LEN    -1004 /* Bad length value in flash list block */
 #define FLASH_IMG_NULL_DATA  -1003 /* Bad data value in flash list block */
 #define FLASH_IMG_READY      0     /* Firmware img ready for flash on reboot */
 
 /* Manage image status values */
 #define MANAGE_AUTH          -9002 /* RTAS Not Service Authority Partition */
 #define MANAGE_ACTIVE_ERR    -9001 /* RTAS Cannot Overwrite Active Img */
 #define MANAGE_NO_OP         -1099 /* No operation initiated by user */
 #define MANAGE_PARAM_ERR     -3    /* RTAS Parameter Error */
 #define MANAGE_HW_ERR        -1    /* RTAS Hardware Error */
 
 /* Validate image status values */
 #define VALIDATE_AUTH          -9002 /* RTAS Not Service Authority Partition */
 #define VALIDATE_NO_OP         -1099 /* No operation initiated by the user */
 #define VALIDATE_INCOMPLETE    -1002 /* User copied < VALIDATE_BUF_SIZE */
 #define VALIDATE_READY         -1001 /* Firmware image ready for validation */
 #define VALIDATE_PARAM_ERR     -3    /* RTAS Parameter Error */
 #define VALIDATE_HW_ERR        -1    /* RTAS Hardware Error */
 
 /* ibm,validate-flash-image update result tokens */
 #define VALIDATE_TMP_UPDATE    0     /* T side will be updated */
 #define VALIDATE_FLASH_AUTH    1     /* Partition does not have authority */
 #define VALIDATE_INVALID_IMG   2     /* Candidate image is not valid */
 #define VALIDATE_CUR_UNKNOWN   3     /* Current fixpack level is unknown */
 /*
  * Current T side will be committed to P side before being replace with new
  * image, and the new image is downlevel from current image
  */
 #define VALIDATE_TMP_COMMIT_DL 4
 /*
  * Current T side will be committed to P side before being replaced with new
  * image
  */
 #define VALIDATE_TMP_COMMIT    5
 /*
  * T side will be updated with a downlevel image
  */
 #define VALIDATE_TMP_UPDATE_DL 6
 /*
  * The candidate image's release date is later than the system's firmware
  * service entitlement date - service warranty period has expired
  */
 #define VALIDATE_OUT_OF_WRNTY  7
 
 /* ibm,manage-flash-image operation tokens */
 #define RTAS_REJECT_TMP_IMG   0
 #define RTAS_COMMIT_TMP_IMG   1
 
 /* Array sizes */
 #define VALIDATE_BUF_SIZE 4096    
 #define VALIDATE_MSG_LEN  256
 #define RTAS_MSG_MAXLEN   64
 
 /* Quirk - RTAS requires 4k list length and block size */
 #define RTAS_BLKLIST_LENGTH 4096
 #define RTAS_BLK_SIZE 4096
 
 struct flash_block {
     char *data;
     unsigned long length;
 };
 
 /* This struct is very similar but not identical to
  * that needed by the rtas flash update.
  * All we need to do for rtas is rewrite num_blocks
  * into a version/length and translate the pointers
  * to absolute.
  */
 #define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block))
 struct flash_block_list {
     unsigned long num_blocks;
     struct flash_block_list *next;
     struct flash_block blocks[FLASH_BLOCKS_PER_NODE];
 };
 
 static struct flash_block_list *rtas_firmware_flash_list;
 
 /* Use slab cache to guarantee 4k alignment */
 static struct kmem_cache *flash_block_cache = NULL;
 
 #define FLASH_BLOCK_LIST_VERSION (1UL)
 
 /*
  * Local copy of the flash block list.
  *
  * The rtas_firmware_flash_list variable will be
  * set once the data is fully read.
  *
  * For convenience as we build the list we use virtual addrs,
  * we do not fill in the version number, and the length field
  * is treated as the number of entries currently in the block
  * (i.e. not a byte count).  This is all fixed when calling 
  * the flash routine.
  */
 
 /* Status int must be first member of struct */
 struct rtas_update_flash_t
 {
     int status;         /* Flash update status */
     struct flash_block_list *flist; /* Local copy of flash block list */
 };
 
 /* Status int must be first member of struct */
 struct rtas_manage_flash_t
 {
     int status;         /* Returned status */
 };
 
 /* Status int must be first member of struct */
 struct rtas_validate_flash_t
 {
     int status;         /* Returned status */   
     char *buf;          /* Candidate image buffer */
     unsigned int buf_size;      /* Size of image buf */
     unsigned int update_results;    /* Update results token */
 };
 
 static struct rtas_update_flash_t rtas_update_flash_data;
 static struct rtas_manage_flash_t rtas_manage_flash_data;
 static struct rtas_validate_flash_t rtas_validate_flash_data;
 static DEFINE_MUTEX(rtas_update_flash_mutex);
 static DEFINE_MUTEX(rtas_manage_flash_mutex);
 static DEFINE_MUTEX(rtas_validate_flash_mutex);
 
 /* Do simple sanity checks on the flash image. */
 static int flash_list_valid(struct flash_block_list *flist)
 {
     struct flash_block_list *f;
     int i;
     unsigned long block_size, image_size;
 
     /* Paranoid self test here.  We also collect the image size. */
     image_size = 0;
     for (f = flist; f; f = f->next) {
         for (i = 0; i < f->num_blocks; i++) {
             if (f->blocks[i].data == NULL) {
                 return FLASH_IMG_NULL_DATA;
             }
             block_size = f->blocks[i].length;
             if (block_size <= 0 || block_size > RTAS_BLK_SIZE) {
                 return FLASH_IMG_BAD_LEN;
             }
             image_size += block_size;
         }
     }
 
     if (image_size < (256 << 10)) {
         if (image_size < 2) 
             return FLASH_NO_OP;
     }
 
     printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size);
 
     return FLASH_IMG_READY;
 }
 
 static void free_flash_list(struct flash_block_list *f)
 {
     struct flash_block_list *next;
     int i;
 
     while (f) {
         for (i = 0; i < f->num_blocks; i++)
             kmem_cache_free(flash_block_cache, f->blocks[i].data);
         next = f->next;
         kmem_cache_free(flash_block_cache, f);
         f = next;
     }
 }
 
 static int rtas_flash_release(struct inode *inode, struct file *file)
 {
     struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
 
     mutex_lock(&rtas_update_flash_mutex);
 
     if (uf->flist) {    
         /* File was opened in write mode for a new flash attempt */
         /* Clear saved list */
         if (rtas_firmware_flash_list) {
             free_flash_list(rtas_firmware_flash_list);
             rtas_firmware_flash_list = NULL;
         }
 
         if (uf->status != FLASH_AUTH)  
             uf->status = flash_list_valid(uf->flist);
 
         if (uf->status == FLASH_IMG_READY) 
             rtas_firmware_flash_list = uf->flist;
         else
             free_flash_list(uf->flist);
 
         uf->flist = NULL;
     }
 
     mutex_unlock(&rtas_update_flash_mutex);
     return 0;
 }
 
 static size_t get_flash_status_msg(int status, char *buf)
 {
     const char *msg;
     size_t len;
 
     switch (status) {
     case FLASH_AUTH:
         msg = "error: this partition does not have service authority\n";
         break;
     case FLASH_NO_OP:
         msg = "info: no firmware image for flash\n";
         break;
     case FLASH_IMG_SHORT:
         msg = "error: flash image short\n";
         break;
     case FLASH_IMG_BAD_LEN:
         msg = "error: internal error bad length\n";
         break;
     case FLASH_IMG_NULL_DATA:
         msg = "error: internal error null data\n";
         break;
     case FLASH_IMG_READY:
         msg = "ready: firmware image ready for flash on reboot\n";
         break;
     default:
         return sprintf(buf, "error: unexpected status value %d\n",
                    status);
     }
 
     len = strlen(msg);
     memcpy(buf, msg, len + 1);
     return len;
 }
 
 /* Reading the proc file will show status (not the firmware contents) */
 static ssize_t rtas_flash_read_msg(struct file *file, char __user *buf,
                    size_t count, loff_t *ppos)
 {
     struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
     char msg[RTAS_MSG_MAXLEN];
     size_t len;
     int status;
 
     mutex_lock(&rtas_update_flash_mutex);
     status = uf->status;
     mutex_unlock(&rtas_update_flash_mutex);
 
     /* Read as text message */
     len = get_flash_status_msg(status, msg);
     return simple_read_from_buffer(buf, count, ppos, msg, len);
 }
 
 static ssize_t rtas_flash_read_num(struct file *file, char __user *buf,
                    size_t count, loff_t *ppos)
 {
     struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
     char msg[RTAS_MSG_MAXLEN];
     int status;
 
     mutex_lock(&rtas_update_flash_mutex);
     status = uf->status;
     mutex_unlock(&rtas_update_flash_mutex);
 
     /* Read as number */
     sprintf(msg, "%d\n", status);
     return simple_read_from_buffer(buf, count, ppos, msg, strlen(msg));
 }
 
 /* We could be much more efficient here.  But to keep this function
  * simple we allocate a page to the block list no matter how small the
  * count is.  If the system is low on memory it will be just as well
  * that we fail....
  */
 static ssize_t rtas_flash_write(struct file *file, const char __user *buffer,
                 size_t count, loff_t *off)
 {
     struct rtas_update_flash_t *const uf = &rtas_update_flash_data;
     char *p;
     int next_free, rc;
     struct flash_block_list *fl;
 
     mutex_lock(&rtas_update_flash_mutex);
 
     if (uf->status == FLASH_AUTH || count == 0)
         goto out;   /* discard data */
 
     /* In the case that the image is not ready for flashing, the memory
      * allocated for the block list will be freed upon the release of the 
      * proc file
      */
     if (uf->flist == NULL) {
         uf->flist = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL);
         if (!uf->flist)
             goto nomem;
     }
 
     fl = uf->flist;
     while (fl->next)
         fl = fl->next; /* seek to last block_list for append */
     next_free = fl->num_blocks;
     if (next_free == FLASH_BLOCKS_PER_NODE) {
         /* Need to allocate another block_list */
         fl->next = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL);
         if (!fl->next)
             goto nomem;
         fl = fl->next;
         next_free = 0;
     }
 
     if (count > RTAS_BLK_SIZE)
         count = RTAS_BLK_SIZE;
     p = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL);
     if (!p)
         goto nomem;
     
     if(copy_from_user(p, buffer, count)) {
         kmem_cache_free(flash_block_cache, p);
         rc = -EFAULT;
         goto error;
     }
     fl->blocks[next_free].data = p;
     fl->blocks[next_free].length = count;
     fl->num_blocks++;
 out:
     mutex_unlock(&rtas_update_flash_mutex);
     return count;
 
 nomem:
     rc = -ENOMEM;
 error:
     mutex_unlock(&rtas_update_flash_mutex);
     return rc;
 }
 
 /*
  * Flash management routines.
  */
 static void manage_flash(struct rtas_manage_flash_t *args_buf, unsigned int op)
 {
     s32 rc;
 
     do {
         rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1, 1,
                    NULL, op);
     } while (rtas_busy_delay(rc));
 
     args_buf->status = rc;
 }
 
 static ssize_t manage_flash_read(struct file *file, char __user *buf,
                    size_t count, loff_t *ppos)
 {
     struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data;
     char msg[RTAS_MSG_MAXLEN];
     int msglen, status;
 
     mutex_lock(&rtas_manage_flash_mutex);
     status = args_buf->status;
     mutex_unlock(&rtas_manage_flash_mutex);
 
     msglen = sprintf(msg, "%d\n", status);
     return simple_read_from_buffer(buf, count, ppos, msg, msglen);
 }
 
 static ssize_t manage_flash_write(struct file *file, const char __user *buf,
                 size_t count, loff_t *off)
 {
     struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data;
     static const char reject_str[] = "0";
     static const char commit_str[] = "1";
     char stkbuf[10];
     int op, rc;
 
     mutex_lock(&rtas_manage_flash_mutex);
 
     if ((args_buf->status == MANAGE_AUTH) || (count == 0))
         goto out;
         
     op = -1;
     if (buf) {
         if (count > 9) count = 9;
         rc = -EFAULT;
         if (copy_from_user (stkbuf, buf, count))
             goto error;
         if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0) 
             op = RTAS_REJECT_TMP_IMG;
         else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0) 
             op = RTAS_COMMIT_TMP_IMG;
     }
     
     if (op == -1) {   /* buf is empty, or contains invalid string */
         rc = -EINVAL;
         goto error;
     }
 
     manage_flash(args_buf, op);
 out:
     mutex_unlock(&rtas_manage_flash_mutex);
     return count;
 
 error:
     mutex_unlock(&rtas_manage_flash_mutex);
     return rc;
 }
 
 /*
  * Validation routines.
  */
 static void validate_flash(struct rtas_validate_flash_t *args_buf)
 {
     int token = rtas_token("ibm,validate-flash-image");
     int update_results;
     s32 rc; 
 
     rc = 0;
     do {
         spin_lock(&rtas_data_buf_lock);
         memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE);
         rc = rtas_call(token, 2, 2, &update_results, 
                    (u32) __pa(rtas_data_buf), args_buf->buf_size);
         memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE);
         spin_unlock(&rtas_data_buf_lock);
     } while (rtas_busy_delay(rc));
 
     args_buf->status = rc;
     args_buf->update_results = update_results;
 }
 
 static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf, 
                            char *msg, int msglen)
 {
     int n;
 
     if (args_buf->status >= VALIDATE_TMP_UPDATE) { 
         n = sprintf(msg, "%d\n", args_buf->update_results);
         if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) ||
             (args_buf->update_results == VALIDATE_TMP_UPDATE))
             n += snprintf(msg + n, msglen - n, "%s\n",
                     args_buf->buf);
     } else {
         n = sprintf(msg, "%d\n", args_buf->status);
     }
     return n;
 }
 
 static ssize_t validate_flash_read(struct file *file, char __user *buf,
                    size_t count, loff_t *ppos)
 {
     struct rtas_validate_flash_t *const args_buf =
         &rtas_validate_flash_data;
     char msg[VALIDATE_MSG_LEN];
     int msglen;
 
     mutex_lock(&rtas_validate_flash_mutex);
     msglen = get_validate_flash_msg(args_buf, msg, VALIDATE_MSG_LEN);
     mutex_unlock(&rtas_validate_flash_mutex);
 
     return simple_read_from_buffer(buf, count, ppos, msg, msglen);
 }
 
 static ssize_t validate_flash_write(struct file *file, const char __user *buf,
                     size_t count, loff_t *off)
 {
     struct rtas_validate_flash_t *const args_buf =
         &rtas_validate_flash_data;
     int rc;
 
     mutex_lock(&rtas_validate_flash_mutex);
 
     /* We are only interested in the first 4K of the
      * candidate image */
     if ((*off >= VALIDATE_BUF_SIZE) || 
         (args_buf->status == VALIDATE_AUTH)) {
         *off += count;
         mutex_unlock(&rtas_validate_flash_mutex);
         return count;
     }
 
     if (*off + count >= VALIDATE_BUF_SIZE)  {
         count = VALIDATE_BUF_SIZE - *off;
         args_buf->status = VALIDATE_READY;  
     } else {
         args_buf->status = VALIDATE_INCOMPLETE;
     }
 
     if (!access_ok(buf, count)) {
         rc = -EFAULT;
         goto done;
     }
     if (copy_from_user(args_buf->buf + *off, buf, count)) {
         rc = -EFAULT;
         goto done;
     }
 
     *off += count;
     rc = count;
 done:
     mutex_unlock(&rtas_validate_flash_mutex);
     return rc;
 }
 
 static int validate_flash_release(struct inode *inode, struct file *file)
 {
     struct rtas_validate_flash_t *const args_buf =
         &rtas_validate_flash_data;
 
     mutex_lock(&rtas_validate_flash_mutex);
 
     if (args_buf->status == VALIDATE_READY) {
         args_buf->buf_size = VALIDATE_BUF_SIZE;
         validate_flash(args_buf);
     }
 
     mutex_unlock(&rtas_validate_flash_mutex);
     return 0;
 }
 
 /*
  * On-reboot flash update applicator.
  */
 static void rtas_flash_firmware(int reboot_type)
 {
     unsigned long image_size;
     struct flash_block_list *f, *next, *flist;
     unsigned long rtas_block_list;
     int i, status, update_token;
 
     if (rtas_firmware_flash_list == NULL)
         return;     /* nothing to do */
 
     if (reboot_type != SYS_RESTART) {
         printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n");
         printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n");
         return;
     }
 
     update_token = rtas_token("ibm,update-flash-64-and-reboot");
     if (update_token == RTAS_UNKNOWN_SERVICE) {
         printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot "
                "is not available -- not a service partition?\n");
         printk(KERN_ALERT "FLASH: firmware will not be flashed\n");
         return;
     }
 
     /*
      * Just before starting the firmware flash, cancel the event scan work
      * to avoid any soft lockup issues.
      */
     rtas_cancel_event_scan();
 
     /*
      * NOTE: the "first" block must be under 4GB, so we create
      * an entry with no data blocks in the reserved buffer in
      * the kernel data segment.
      */
     spin_lock(&rtas_data_buf_lock);
     flist = (struct flash_block_list *)&rtas_data_buf[0];
     flist->num_blocks = 0;
     flist->next = rtas_firmware_flash_list;
     rtas_block_list = __pa(flist);
     if (rtas_block_list >= 4UL*1024*1024*1024) {
         printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n");
         spin_unlock(&rtas_data_buf_lock);
         return;
     }
 
     printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
     /* Update the block_list in place. */
     rtas_firmware_flash_list = NULL; /* too hard to backout on error */
     image_size = 0;
     for (f = flist; f; f = next) {
         /* Translate data addrs to absolute */
         for (i = 0; i < f->num_blocks; i++) {
             f->blocks[i].data = (char *)cpu_to_be64(__pa(f->blocks[i].data));
             image_size += f->blocks[i].length;
             f->blocks[i].length = cpu_to_be64(f->blocks[i].length);
         }
         next = f->next;
         /* Don't translate NULL pointer for last entry */
         if (f->next)
             f->next = (struct flash_block_list *)cpu_to_be64(__pa(f->next));
         else
             f->next = NULL;
         /* make num_blocks into the version/length field */
         f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
         f->num_blocks = cpu_to_be64(f->num_blocks);
     }
 
     printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size);
     printk(KERN_ALERT "FLASH: performing flash and reboot\n");
     rtas_progress("Flashing        \n", 0x0);
     rtas_progress("Please Wait...  ", 0x0);
     printk(KERN_ALERT "FLASH: this will take several minutes.  Do not power off!\n");
     status = rtas_call(update_token, 1, 1, NULL, rtas_block_list);
     switch (status) {   /* should only get "bad" status */
         case 0:
         printk(KERN_ALERT "FLASH: success\n");
         break;
         case -1:
         printk(KERN_ALERT "FLASH: hardware error.  Firmware may not be not flashed\n");
         break;
         case -3:
         printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform.  Firmware not flashed\n");
         break;
         case -4:
         printk(KERN_ALERT "FLASH: flash failed when partially complete.  System may not reboot\n");
         break;
         default:
         printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
         break;
     }
     spin_unlock(&rtas_data_buf_lock);
 }
 
 /*
  * Manifest of proc files to create
  */
 struct rtas_flash_file {
     const char *filename;
     const char *rtas_call_name;
     int *status;
     const struct proc_ops ops;
 };
 
 static const struct rtas_flash_file rtas_flash_files[] = {
     {
         .filename   = "powerpc/rtas/" FIRMWARE_FLASH_NAME,
         .rtas_call_name = "ibm,update-flash-64-and-reboot",
         .status     = &rtas_update_flash_data.status,
         .ops.proc_read  = rtas_flash_read_msg,
         .ops.proc_write = rtas_flash_write,
         .ops.proc_release = rtas_flash_release,
         .ops.proc_lseek = default_llseek,
     },
     {
         .filename   = "powerpc/rtas/" FIRMWARE_UPDATE_NAME,
         .rtas_call_name = "ibm,update-flash-64-and-reboot",
         .status     = &rtas_update_flash_data.status,
         .ops.proc_read  = rtas_flash_read_num,
         .ops.proc_write = rtas_flash_write,
         .ops.proc_release = rtas_flash_release,
         .ops.proc_lseek = default_llseek,
     },
     {
         .filename   = "powerpc/rtas/" VALIDATE_FLASH_NAME,
         .rtas_call_name = "ibm,validate-flash-image",
         .status     = &rtas_validate_flash_data.status,
         .ops.proc_read  = validate_flash_read,
         .ops.proc_write = validate_flash_write,
         .ops.proc_release = validate_flash_release,
         .ops.proc_lseek = default_llseek,
     },
     {
         .filename   = "powerpc/rtas/" MANAGE_FLASH_NAME,
         .rtas_call_name = "ibm,manage-flash-image",
         .status     = &rtas_manage_flash_data.status,
         .ops.proc_read  = manage_flash_read,
         .ops.proc_write = manage_flash_write,
         .ops.proc_lseek = default_llseek,
     }
 };
 
 static int __init rtas_flash_init(void)
 {
     int i;
 
     if (rtas_token("ibm,update-flash-64-and-reboot") ==
                RTAS_UNKNOWN_SERVICE) {
         pr_info("rtas_flash: no firmware flash support\n");
         return -EINVAL;
     }
 
     rtas_validate_flash_data.buf = kzalloc(VALIDATE_BUF_SIZE, GFP_KERNEL);
     if (!rtas_validate_flash_data.buf)
         return -ENOMEM;
 
     flash_block_cache = kmem_cache_create("rtas_flash_cache",
                           RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0,
                           NULL);
     if (!flash_block_cache) {
         printk(KERN_ERR "%s: failed to create block cache\n",
                 __func__);
         goto enomem_buf;
     }
 
     for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) {
         const struct rtas_flash_file *f = &rtas_flash_files[i];
         int token;
 
         if (!proc_create(f->filename, 0600, NULL, &f->ops))
             goto enomem;
 
         /*
          * This code assumes that the status int is the first member of the
          * struct
          */
         token = rtas_token(f->rtas_call_name);
         if (token == RTAS_UNKNOWN_SERVICE)
             *f->status = FLASH_AUTH;
         else
             *f->status = FLASH_NO_OP;
     }
 
     rtas_flash_term_hook = rtas_flash_firmware;
     return 0;
 
 enomem:
     while (--i >= 0) {
         const struct rtas_flash_file *f = &rtas_flash_files[i];
         remove_proc_entry(f->filename, NULL);
     }
 
     kmem_cache_destroy(flash_block_cache);
 enomem_buf:
     kfree(rtas_validate_flash_data.buf);
     return -ENOMEM;
 }
 
 static void __exit rtas_flash_cleanup(void)
 {
     int i;
 
     rtas_flash_term_hook = NULL;
 
     if (rtas_firmware_flash_list) {
         free_flash_list(rtas_firmware_flash_list);
         rtas_firmware_flash_list = NULL;
     }
 
     for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) {
         const struct rtas_flash_file *f = &rtas_flash_files[i];
         remove_proc_entry(f->filename, NULL);
     }
 
     kmem_cache_destroy(flash_block_cache);
     kfree(rtas_validate_flash_data.buf);
 }
 
 module_init(rtas_flash_init);
 module_exit(rtas_flash_cleanup);
 MODULE_LICENSE("GPL");

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