2 * bsg.c - block layer implementation of the sg v3 interface
4 * Copyright (C) 2004 Jens Axboe <axboe@suse.de> SUSE Labs
5 * Copyright (C) 2004 Peter M. Jones <pjones@redhat.com>
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License version 2. See the file "COPYING" in the main directory of this
9 * archive for more details.
14 * - Should this get merged, block/scsi_ioctl.c will be migrated into
15 * this file. To keep maintenance down, it's easier to have them
16 * seperated right now.
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/file.h>
22 #include <linux/blkdev.h>
23 #include <linux/poll.h>
24 #include <linux/cdev.h>
25 #include <linux/percpu.h>
26 #include <linux/uio.h>
27 #include <linux/bsg.h>
29 #include <scsi/scsi.h>
30 #include <scsi/scsi_ioctl.h>
31 #include <scsi/scsi_cmnd.h>
32 #include <scsi/scsi_device.h>
33 #include <scsi/scsi_driver.h>
36 static char bsg_version[] = "block layer sg (bsg) 0.4";
39 request_queue_t *queue;
41 struct list_head busy_list;
42 struct list_head done_list;
43 struct hlist_node dev_list;
48 wait_queue_head_t wq_done;
49 wait_queue_head_t wq_free;
50 char name[BUS_ID_SIZE];
60 #define BSG_DEFAULT_CMDS 64
61 #define BSG_MAX_DEVS 32768
66 #define dprintk(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ##args)
68 #define dprintk(fmt, args...)
71 #define list_entry_bc(entry) list_entry((entry), struct bsg_command, list)
76 #define BSG_MAJOR (240)
78 static DEFINE_MUTEX(bsg_mutex);
79 static int bsg_device_nr, bsg_minor_idx;
81 #define BSG_LIST_SIZE (8)
82 #define bsg_list_idx(minor) ((minor) & (BSG_LIST_SIZE - 1))
83 static struct hlist_head bsg_device_list[BSG_LIST_SIZE];
85 static struct class *bsg_class;
86 static LIST_HEAD(bsg_class_list);
88 static struct kmem_cache *bsg_cmd_cachep;
91 * our internal command type
94 struct bsg_device *bd;
95 struct list_head list;
100 struct sg_io_v4 __user *uhdr;
101 char sense[SCSI_SENSE_BUFFERSIZE];
104 static void bsg_free_command(struct bsg_command *bc)
106 struct bsg_device *bd = bc->bd;
109 kmem_cache_free(bsg_cmd_cachep, bc);
111 spin_lock_irqsave(&bd->lock, flags);
113 spin_unlock_irqrestore(&bd->lock, flags);
115 wake_up(&bd->wq_free);
118 static struct bsg_command *__bsg_alloc_command(struct bsg_device *bd)
120 struct bsg_command *bc = NULL;
122 spin_lock_irq(&bd->lock);
124 if (bd->queued_cmds >= bd->max_queue)
128 spin_unlock_irq(&bd->lock);
130 bc = kmem_cache_alloc(bsg_cmd_cachep, GFP_USER);
132 spin_lock_irq(&bd->lock);
137 memset(bc, 0, sizeof(*bc));
139 INIT_LIST_HEAD(&bc->list);
140 dprintk("%s: returning free cmd %p\n", bd->name, bc);
143 spin_unlock_irq(&bd->lock);
148 bsg_del_done_cmd(struct bsg_device *bd, struct bsg_command *bc)
155 bsg_add_done_cmd(struct bsg_device *bd, struct bsg_command *bc)
158 list_add_tail(&bc->list, &bd->done_list);
159 wake_up(&bd->wq_done);
162 static inline int bsg_io_schedule(struct bsg_device *bd, int state)
167 spin_lock_irq(&bd->lock);
169 BUG_ON(bd->done_cmds > bd->queued_cmds);
172 * -ENOSPC or -ENODATA? I'm going for -ENODATA, meaning "I have no
173 * work to do", even though we return -ENOSPC after this same test
174 * during bsg_write() -- there, it means our buffer can't have more
175 * bsg_commands added to it, thus has no space left.
177 if (bd->done_cmds == bd->queued_cmds) {
182 if (!test_bit(BSG_F_BLOCK, &bd->flags)) {
187 prepare_to_wait(&bd->wq_done, &wait, state);
188 spin_unlock_irq(&bd->lock);
190 finish_wait(&bd->wq_done, &wait);
192 if ((state == TASK_INTERRUPTIBLE) && signal_pending(current))
197 spin_unlock_irq(&bd->lock);
202 * get a new free command, blocking if needed and specified
204 static struct bsg_command *bsg_get_command(struct bsg_device *bd)
206 struct bsg_command *bc;
210 bc = __bsg_alloc_command(bd);
214 ret = bsg_io_schedule(bd, TASK_INTERRUPTIBLE);
225 static int blk_fill_sgv4_hdr_rq(request_queue_t *q, struct request *rq,
226 struct sg_io_v4 *hdr, int has_write_perm)
228 memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
230 if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request,
233 if (blk_verify_command(rq->cmd, has_write_perm))
237 * fill in request structure
239 rq->cmd_len = hdr->request_len;
240 rq->cmd_type = REQ_TYPE_BLOCK_PC;
242 rq->timeout = (hdr->timeout * HZ) / 1000;
244 rq->timeout = q->sg_timeout;
246 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
252 * Check if sg_io_v4 from user is allowed and valid
255 bsg_validate_sgv4_hdr(request_queue_t *q, struct sg_io_v4 *hdr, int *rw)
257 if (hdr->guard != 'Q')
259 if (hdr->request_len > BLK_MAX_CDB)
261 if (hdr->dout_xfer_len > (q->max_sectors << 9) ||
262 hdr->din_xfer_len > (q->max_sectors << 9))
265 /* not supported currently */
266 if (hdr->protocol || hdr->subprotocol)
270 * looks sane, if no data then it should be fine from our POV
272 if (!hdr->dout_xfer_len && !hdr->din_xfer_len)
275 /* not supported currently */
276 if (hdr->dout_xfer_len && hdr->din_xfer_len)
279 *rw = hdr->dout_xfer_len ? WRITE : READ;
285 * map sg_io_v4 to a request.
287 static struct request *
288 bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr)
290 request_queue_t *q = bd->queue;
292 int ret, rw = 0; /* shut up gcc */
293 unsigned int dxfer_len;
296 dprintk("map hdr %llx/%u %llx/%u\n", (unsigned long long) hdr->dout_xferp,
297 hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp,
300 ret = bsg_validate_sgv4_hdr(q, hdr, &rw);
305 * map scatter-gather elements seperately and string them to request
307 rq = blk_get_request(q, rw, GFP_KERNEL);
308 ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, test_bit(BSG_F_WRITE_PERM,
315 if (hdr->dout_xfer_len) {
316 dxfer_len = hdr->dout_xfer_len;
317 dxferp = (void*)(unsigned long)hdr->dout_xferp;
318 } else if (hdr->din_xfer_len) {
319 dxfer_len = hdr->din_xfer_len;
320 dxferp = (void*)(unsigned long)hdr->din_xferp;
325 ret = blk_rq_map_user(q, rq, dxferp, dxfer_len);
327 dprintk("failed map at %d\n", ret);
337 * async completion call-back from the block layer, when scsi/ide/whatever
338 * calls end_that_request_last() on a request
340 static void bsg_rq_end_io(struct request *rq, int uptodate)
342 struct bsg_command *bc = rq->end_io_data;
343 struct bsg_device *bd = bc->bd;
346 dprintk("%s: finished rq %p bc %p, bio %p stat %d\n",
347 bd->name, rq, bc, bc->bio, uptodate);
349 bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration);
351 spin_lock_irqsave(&bd->lock, flags);
353 bsg_add_done_cmd(bd, bc);
354 spin_unlock_irqrestore(&bd->lock, flags);
358 * do final setup of a 'bc' and submit the matching 'rq' to the block
361 static void bsg_add_command(struct bsg_device *bd, request_queue_t *q,
362 struct bsg_command *bc, struct request *rq)
364 rq->sense = bc->sense;
368 * add bc command to busy queue and submit rq for io
372 bc->hdr.duration = jiffies;
373 spin_lock_irq(&bd->lock);
374 list_add_tail(&bc->list, &bd->busy_list);
375 spin_unlock_irq(&bd->lock);
377 dprintk("%s: queueing rq %p, bc %p\n", bd->name, rq, bc);
379 rq->end_io_data = bc;
380 blk_execute_rq_nowait(q, NULL, rq, 1, bsg_rq_end_io);
383 static inline struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd)
385 struct bsg_command *bc = NULL;
387 spin_lock_irq(&bd->lock);
389 bc = list_entry_bc(bd->done_list.next);
390 bsg_del_done_cmd(bd, bc);
392 spin_unlock_irq(&bd->lock);
398 * Get a finished command from the done list
400 static struct bsg_command *__bsg_get_done_cmd(struct bsg_device *bd, int state)
402 struct bsg_command *bc;
406 bc = bsg_next_done_cmd(bd);
410 ret = bsg_io_schedule(bd, state);
417 dprintk("%s: returning done %p\n", bd->name, bc);
422 static struct bsg_command *
423 bsg_get_done_cmd(struct bsg_device *bd, const struct iovec *iov)
425 return __bsg_get_done_cmd(bd, TASK_INTERRUPTIBLE);
428 static struct bsg_command *
429 bsg_get_done_cmd_nosignals(struct bsg_device *bd)
431 return __bsg_get_done_cmd(bd, TASK_UNINTERRUPTIBLE);
434 static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
439 dprintk("rq %p bio %p %u\n", rq, bio, rq->errors);
441 * fill in all the output members
443 hdr->device_status = status_byte(rq->errors);
444 hdr->transport_status = host_byte(rq->errors);
445 hdr->driver_status = driver_byte(rq->errors);
447 if (hdr->device_status || hdr->transport_status || hdr->driver_status)
448 hdr->info |= SG_INFO_CHECK;
449 hdr->din_resid = rq->data_len;
450 hdr->response_len = 0;
452 if (rq->sense_len && hdr->response) {
453 int len = min((unsigned int) hdr->max_response_len,
456 ret = copy_to_user((void*)(unsigned long)hdr->response,
459 hdr->response_len = len;
464 blk_rq_unmap_user(bio);
470 static int bsg_complete_all_commands(struct bsg_device *bd)
472 struct bsg_command *bc;
475 dprintk("%s: entered\n", bd->name);
477 set_bit(BSG_F_BLOCK, &bd->flags);
480 * wait for all commands to complete
484 ret = bsg_io_schedule(bd, TASK_UNINTERRUPTIBLE);
486 * look for -ENODATA specifically -- we'll sometimes get
487 * -ERESTARTSYS when we've taken a signal, but we can't
488 * return until we're done freeing the queue, so ignore
489 * it. The signal will get handled when we're done freeing
492 } while (ret != -ENODATA);
495 * discard done commands
499 bc = bsg_get_done_cmd_nosignals(bd);
502 * we _must_ complete before restarting, because
503 * bsg_release can't handle this failing.
505 if (PTR_ERR(bc) == -ERESTARTSYS)
512 tret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio);
516 bsg_free_command(bc);
522 typedef struct bsg_command *(*bsg_command_callback)(struct bsg_device *bd, const struct iovec *iov);
525 __bsg_read(char __user *buf, size_t count, bsg_command_callback get_bc,
526 struct bsg_device *bd, const struct iovec *iov, ssize_t *bytes_read)
528 struct bsg_command *bc;
529 int nr_commands, ret;
531 if (count % sizeof(struct sg_io_v4))
535 nr_commands = count / sizeof(struct sg_io_v4);
536 while (nr_commands) {
537 bc = get_bc(bd, iov);
544 * this is the only case where we need to copy data back
545 * after completing the request. so do that here,
546 * bsg_complete_work() cannot do that for us
548 ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio);
550 if (copy_to_user(buf, (char *) &bc->hdr, sizeof(bc->hdr)))
553 bsg_free_command(bc);
558 buf += sizeof(struct sg_io_v4);
559 *bytes_read += sizeof(struct sg_io_v4);
566 static inline void bsg_set_block(struct bsg_device *bd, struct file *file)
568 if (file->f_flags & O_NONBLOCK)
569 clear_bit(BSG_F_BLOCK, &bd->flags);
571 set_bit(BSG_F_BLOCK, &bd->flags);
574 static inline void bsg_set_write_perm(struct bsg_device *bd, struct file *file)
576 if (file->f_mode & FMODE_WRITE)
577 set_bit(BSG_F_WRITE_PERM, &bd->flags);
579 clear_bit(BSG_F_WRITE_PERM, &bd->flags);
582 static inline int err_block_err(int ret)
584 if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN)
591 bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
593 struct bsg_device *bd = file->private_data;
597 dprintk("%s: read %Zd bytes\n", bd->name, count);
599 bsg_set_block(bd, file);
601 ret = __bsg_read(buf, count, bsg_get_done_cmd,
602 bd, NULL, &bytes_read);
605 if (!bytes_read || (bytes_read && err_block_err(ret)))
611 static ssize_t __bsg_write(struct bsg_device *bd, const char __user *buf,
612 size_t count, ssize_t *bytes_read)
614 struct bsg_command *bc;
616 int ret, nr_commands;
618 if (count % sizeof(struct sg_io_v4))
621 nr_commands = count / sizeof(struct sg_io_v4);
625 while (nr_commands) {
626 request_queue_t *q = bd->queue;
628 bc = bsg_get_command(bd);
637 bc->uhdr = (struct sg_io_v4 __user *) buf;
638 if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) {
644 * get a request, fill in the blanks, and add to request queue
646 rq = bsg_map_hdr(bd, &bc->hdr);
653 bsg_add_command(bd, q, bc, rq);
657 buf += sizeof(struct sg_io_v4);
658 *bytes_read += sizeof(struct sg_io_v4);
662 bsg_free_command(bc);
668 bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
670 struct bsg_device *bd = file->private_data;
674 dprintk("%s: write %Zd bytes\n", bd->name, count);
676 bsg_set_block(bd, file);
677 bsg_set_write_perm(bd, file);
680 ret = __bsg_write(bd, buf, count, &bytes_read);
684 * return bytes written on non-fatal errors
686 if (!bytes_read || (bytes_read && err_block_err(ret)))
689 dprintk("%s: returning %Zd\n", bd->name, bytes_read);
693 static struct bsg_device *bsg_alloc_device(void)
695 struct bsg_device *bd;
697 bd = kzalloc(sizeof(struct bsg_device), GFP_KERNEL);
701 spin_lock_init(&bd->lock);
703 bd->max_queue = BSG_DEFAULT_CMDS;
705 INIT_LIST_HEAD(&bd->busy_list);
706 INIT_LIST_HEAD(&bd->done_list);
707 INIT_HLIST_NODE(&bd->dev_list);
709 init_waitqueue_head(&bd->wq_free);
710 init_waitqueue_head(&bd->wq_done);
714 static int bsg_put_device(struct bsg_device *bd)
718 mutex_lock(&bsg_mutex);
720 if (!atomic_dec_and_test(&bd->ref_count))
723 dprintk("%s: tearing down\n", bd->name);
726 * close can always block
728 set_bit(BSG_F_BLOCK, &bd->flags);
731 * correct error detection baddies here again. it's the responsibility
732 * of the app to properly reap commands before close() if it wants
733 * fool-proof error detection
735 ret = bsg_complete_all_commands(bd);
737 blk_put_queue(bd->queue);
738 hlist_del(&bd->dev_list);
741 mutex_unlock(&bsg_mutex);
745 static struct bsg_device *bsg_add_device(struct inode *inode,
746 struct request_queue *rq,
749 struct bsg_device *bd = NULL;
751 unsigned char buf[32];
754 bd = bsg_alloc_device();
756 return ERR_PTR(-ENOMEM);
759 kobject_get(&rq->kobj);
760 bsg_set_block(bd, file);
762 atomic_set(&bd->ref_count, 1);
763 bd->minor = iminor(inode);
764 mutex_lock(&bsg_mutex);
765 hlist_add_head(&bd->dev_list, &bsg_device_list[bsg_list_idx(bd->minor)]);
767 strncpy(bd->name, rq->bsg_dev.class_dev->class_id, sizeof(bd->name) - 1);
768 dprintk("bound to <%s>, max queue %d\n",
769 format_dev_t(buf, inode->i_rdev), bd->max_queue);
771 mutex_unlock(&bsg_mutex);
775 static struct bsg_device *__bsg_get_device(int minor)
777 struct hlist_head *list = &bsg_device_list[bsg_list_idx(minor)];
778 struct bsg_device *bd = NULL;
779 struct hlist_node *entry;
781 mutex_lock(&bsg_mutex);
783 hlist_for_each(entry, list) {
784 bd = hlist_entry(entry, struct bsg_device, dev_list);
785 if (bd->minor == minor) {
786 atomic_inc(&bd->ref_count);
793 mutex_unlock(&bsg_mutex);
797 static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file)
799 struct bsg_device *bd = __bsg_get_device(iminor(inode));
800 struct bsg_class_device *bcd, *__bcd;
806 * find the class device
809 mutex_lock(&bsg_mutex);
810 list_for_each_entry(__bcd, &bsg_class_list, list) {
811 if (__bcd->minor == iminor(inode)) {
816 mutex_unlock(&bsg_mutex);
819 return ERR_PTR(-ENODEV);
821 return bsg_add_device(inode, bcd->queue, file);
824 static int bsg_open(struct inode *inode, struct file *file)
826 struct bsg_device *bd = bsg_get_device(inode, file);
831 file->private_data = bd;
835 static int bsg_release(struct inode *inode, struct file *file)
837 struct bsg_device *bd = file->private_data;
839 file->private_data = NULL;
840 return bsg_put_device(bd);
843 static unsigned int bsg_poll(struct file *file, poll_table *wait)
845 struct bsg_device *bd = file->private_data;
846 unsigned int mask = 0;
848 poll_wait(file, &bd->wq_done, wait);
849 poll_wait(file, &bd->wq_free, wait);
851 spin_lock_irq(&bd->lock);
852 if (!list_empty(&bd->done_list))
853 mask |= POLLIN | POLLRDNORM;
854 if (bd->queued_cmds >= bd->max_queue)
856 spin_unlock_irq(&bd->lock);
862 bsg_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
865 struct bsg_device *bd = file->private_data;
866 int __user *uarg = (int __user *) arg;
875 case SG_GET_COMMAND_Q:
876 return put_user(bd->max_queue, uarg);
877 case SG_SET_COMMAND_Q: {
880 if (get_user(queue, uarg))
885 spin_lock_irq(&bd->lock);
886 bd->max_queue = queue;
887 spin_unlock_irq(&bd->lock);
894 case SG_GET_VERSION_NUM:
895 case SCSI_IOCTL_GET_IDLUN:
896 case SCSI_IOCTL_GET_BUS_NUMBER:
899 case SG_GET_RESERVED_SIZE:
900 case SG_SET_RESERVED_SIZE:
901 case SG_EMULATED_HOST:
902 case SCSI_IOCTL_SEND_COMMAND: {
903 void __user *uarg = (void __user *) arg;
904 return scsi_cmd_ioctl(file, bd->queue, NULL, cmd, uarg);
911 if (copy_from_user(&hdr, uarg, sizeof(hdr)))
914 rq = bsg_map_hdr(bd, &hdr);
919 blk_execute_rq(bd->queue, NULL, rq, 0);
920 blk_complete_sgv4_hdr_rq(rq, &hdr, bio);
922 if (copy_to_user(uarg, &hdr, sizeof(hdr)))
928 * block device ioctls
932 return ioctl_by_bdev(bd->bdev, cmd, arg);
939 static struct file_operations bsg_fops = {
944 .release = bsg_release,
946 .owner = THIS_MODULE,
949 void bsg_unregister_queue(struct request_queue *q)
951 struct bsg_class_device *bcd = &q->bsg_dev;
956 mutex_lock(&bsg_mutex);
957 sysfs_remove_link(&q->kobj, "bsg");
958 class_device_destroy(bsg_class, MKDEV(BSG_MAJOR, bcd->minor));
959 bcd->class_dev = NULL;
960 list_del_init(&bcd->list);
962 mutex_unlock(&bsg_mutex);
964 EXPORT_SYMBOL_GPL(bsg_unregister_queue);
966 int bsg_register_queue(struct request_queue *q, const char *name)
968 struct bsg_class_device *bcd, *__bcd;
971 struct class_device *class_dev = NULL;
974 * we need a proper transport to send commands, not a stacked device
980 memset(bcd, 0, sizeof(*bcd));
981 INIT_LIST_HEAD(&bcd->list);
983 mutex_lock(&bsg_mutex);
984 if (bsg_device_nr == BSG_MAX_DEVS) {
985 printk(KERN_ERR "bsg: too many bsg devices\n");
990 list_for_each_entry(__bcd, &bsg_class_list, list) {
991 if (__bcd->minor == bsg_minor_idx) {
993 if (bsg_minor_idx == BSG_MAX_DEVS)
999 bcd->minor = bsg_minor_idx++;
1000 if (bsg_minor_idx == BSG_MAX_DEVS)
1004 dev = MKDEV(BSG_MAJOR, bcd->minor);
1005 class_dev = class_device_create(bsg_class, NULL, dev, bcd->dev, "%s", name);
1006 if (IS_ERR(class_dev)) {
1007 ret = PTR_ERR(class_dev);
1010 bcd->class_dev = class_dev;
1012 if (q->kobj.dentry) {
1013 ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg");
1018 list_add_tail(&bcd->list, &bsg_class_list);
1021 mutex_unlock(&bsg_mutex);
1025 class_device_destroy(bsg_class, MKDEV(BSG_MAJOR, bcd->minor));
1026 mutex_unlock(&bsg_mutex);
1029 EXPORT_SYMBOL_GPL(bsg_register_queue);
1031 static int bsg_add(struct class_device *cl_dev, struct class_interface *cl_intf)
1034 struct scsi_device *sdp = to_scsi_device(cl_dev->dev);
1035 struct request_queue *rq = sdp->request_queue;
1037 if (rq->kobj.parent)
1038 ret = bsg_register_queue(rq, kobject_name(rq->kobj.parent));
1040 ret = bsg_register_queue(rq, kobject_name(&sdp->sdev_gendev.kobj));
1044 static void bsg_remove(struct class_device *cl_dev, struct class_interface *cl_intf)
1046 bsg_unregister_queue(to_scsi_device(cl_dev->dev)->request_queue);
1049 static struct class_interface bsg_intf = {
1051 .remove = bsg_remove,
1054 static struct cdev bsg_cdev = {
1055 .kobj = {.name = "bsg", },
1056 .owner = THIS_MODULE,
1059 static int __init bsg_init(void)
1063 bsg_cmd_cachep = kmem_cache_create("bsg_cmd",
1064 sizeof(struct bsg_command), 0, 0, NULL, NULL);
1065 if (!bsg_cmd_cachep) {
1066 printk(KERN_ERR "bsg: failed creating slab cache\n");
1070 for (i = 0; i < BSG_LIST_SIZE; i++)
1071 INIT_HLIST_HEAD(&bsg_device_list[i]);
1073 bsg_class = class_create(THIS_MODULE, "bsg");
1074 if (IS_ERR(bsg_class)) {
1075 kmem_cache_destroy(bsg_cmd_cachep);
1076 return PTR_ERR(bsg_class);
1079 ret = register_chrdev_region(MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS, "bsg");
1081 kmem_cache_destroy(bsg_cmd_cachep);
1082 class_destroy(bsg_class);
1086 cdev_init(&bsg_cdev, &bsg_fops);
1087 ret = cdev_add(&bsg_cdev, MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS);
1089 kmem_cache_destroy(bsg_cmd_cachep);
1090 class_destroy(bsg_class);
1091 unregister_chrdev_region(MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS);
1095 ret = scsi_register_interface(&bsg_intf);
1097 printk(KERN_ERR "bsg: failed register scsi interface %d\n", ret);
1098 kmem_cache_destroy(bsg_cmd_cachep);
1099 class_destroy(bsg_class);
1100 unregister_chrdev(BSG_MAJOR, "bsg");
1104 printk(KERN_INFO "%s loaded\n", bsg_version);
1108 MODULE_AUTHOR("Jens Axboe");
1109 MODULE_DESCRIPTION("Block layer SGSI generic (sg) driver");
1110 MODULE_LICENSE("GPL");
1112 device_initcall(bsg_init);