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 = ERR_PTR(-EINVAL);
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);
134 bc = ERR_PTR(-ENOMEM);
138 memset(bc, 0, sizeof(*bc));
140 INIT_LIST_HEAD(&bc->list);
141 dprintk("%s: returning free cmd %p\n", bd->name, bc);
144 spin_unlock_irq(&bd->lock);
149 bsg_del_done_cmd(struct bsg_device *bd, struct bsg_command *bc)
156 bsg_add_done_cmd(struct bsg_device *bd, struct bsg_command *bc)
159 list_add_tail(&bc->list, &bd->done_list);
160 wake_up(&bd->wq_done);
163 static inline int bsg_io_schedule(struct bsg_device *bd, int state)
168 spin_lock_irq(&bd->lock);
170 BUG_ON(bd->done_cmds > bd->queued_cmds);
173 * -ENOSPC or -ENODATA? I'm going for -ENODATA, meaning "I have no
174 * work to do", even though we return -ENOSPC after this same test
175 * during bsg_write() -- there, it means our buffer can't have more
176 * bsg_commands added to it, thus has no space left.
178 if (bd->done_cmds == bd->queued_cmds) {
183 if (!test_bit(BSG_F_BLOCK, &bd->flags)) {
188 prepare_to_wait(&bd->wq_done, &wait, state);
189 spin_unlock_irq(&bd->lock);
191 finish_wait(&bd->wq_done, &wait);
193 if ((state == TASK_INTERRUPTIBLE) && signal_pending(current))
198 spin_unlock_irq(&bd->lock);
202 static int blk_fill_sgv4_hdr_rq(request_queue_t *q, struct request *rq,
203 struct sg_io_v4 *hdr, int has_write_perm)
205 memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
207 if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request,
210 if (blk_verify_command(rq->cmd, has_write_perm))
214 * fill in request structure
216 rq->cmd_len = hdr->request_len;
217 rq->cmd_type = REQ_TYPE_BLOCK_PC;
219 rq->timeout = (hdr->timeout * HZ) / 1000;
221 rq->timeout = q->sg_timeout;
223 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
229 * Check if sg_io_v4 from user is allowed and valid
232 bsg_validate_sgv4_hdr(request_queue_t *q, struct sg_io_v4 *hdr, int *rw)
234 if (hdr->guard != 'Q')
236 if (hdr->request_len > BLK_MAX_CDB)
238 if (hdr->dout_xfer_len > (q->max_sectors << 9) ||
239 hdr->din_xfer_len > (q->max_sectors << 9))
242 /* not supported currently */
243 if (hdr->protocol || hdr->subprotocol)
247 * looks sane, if no data then it should be fine from our POV
249 if (!hdr->dout_xfer_len && !hdr->din_xfer_len)
252 /* not supported currently */
253 if (hdr->dout_xfer_len && hdr->din_xfer_len)
256 *rw = hdr->dout_xfer_len ? WRITE : READ;
262 * map sg_io_v4 to a request.
264 static struct request *
265 bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr)
267 request_queue_t *q = bd->queue;
269 int ret, rw = 0; /* shut up gcc */
270 unsigned int dxfer_len;
273 dprintk("map hdr %llx/%u %llx/%u\n", (unsigned long long) hdr->dout_xferp,
274 hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp,
277 ret = bsg_validate_sgv4_hdr(q, hdr, &rw);
282 * map scatter-gather elements seperately and string them to request
284 rq = blk_get_request(q, rw, GFP_KERNEL);
285 ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, test_bit(BSG_F_WRITE_PERM,
292 if (hdr->dout_xfer_len) {
293 dxfer_len = hdr->dout_xfer_len;
294 dxferp = (void*)(unsigned long)hdr->dout_xferp;
295 } else if (hdr->din_xfer_len) {
296 dxfer_len = hdr->din_xfer_len;
297 dxferp = (void*)(unsigned long)hdr->din_xferp;
302 ret = blk_rq_map_user(q, rq, dxferp, dxfer_len);
304 dprintk("failed map at %d\n", ret);
314 * async completion call-back from the block layer, when scsi/ide/whatever
315 * calls end_that_request_last() on a request
317 static void bsg_rq_end_io(struct request *rq, int uptodate)
319 struct bsg_command *bc = rq->end_io_data;
320 struct bsg_device *bd = bc->bd;
323 dprintk("%s: finished rq %p bc %p, bio %p stat %d\n",
324 bd->name, rq, bc, bc->bio, uptodate);
326 bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration);
328 spin_lock_irqsave(&bd->lock, flags);
330 bsg_add_done_cmd(bd, bc);
331 spin_unlock_irqrestore(&bd->lock, flags);
335 * do final setup of a 'bc' and submit the matching 'rq' to the block
338 static void bsg_add_command(struct bsg_device *bd, request_queue_t *q,
339 struct bsg_command *bc, struct request *rq)
341 rq->sense = bc->sense;
345 * add bc command to busy queue and submit rq for io
349 bc->hdr.duration = jiffies;
350 spin_lock_irq(&bd->lock);
351 list_add_tail(&bc->list, &bd->busy_list);
352 spin_unlock_irq(&bd->lock);
354 dprintk("%s: queueing rq %p, bc %p\n", bd->name, rq, bc);
356 rq->end_io_data = bc;
357 blk_execute_rq_nowait(q, NULL, rq, 1, bsg_rq_end_io);
360 static inline struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd)
362 struct bsg_command *bc = NULL;
364 spin_lock_irq(&bd->lock);
366 bc = list_entry_bc(bd->done_list.next);
367 bsg_del_done_cmd(bd, bc);
369 spin_unlock_irq(&bd->lock);
375 * Get a finished command from the done list
377 static struct bsg_command *bsg_get_done_cmd(struct bsg_device *bd)
379 struct bsg_command *bc;
383 bc = bsg_next_done_cmd(bd);
387 if (!test_bit(BSG_F_BLOCK, &bd->flags)) {
388 bc = ERR_PTR(-EAGAIN);
392 ret = wait_event_interruptible(bd->wq_done, bd->done_cmds);
394 bc = ERR_PTR(-ERESTARTSYS);
399 dprintk("%s: returning done %p\n", bd->name, bc);
404 static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
409 dprintk("rq %p bio %p %u\n", rq, bio, rq->errors);
411 * fill in all the output members
413 hdr->device_status = status_byte(rq->errors);
414 hdr->transport_status = host_byte(rq->errors);
415 hdr->driver_status = driver_byte(rq->errors);
417 if (hdr->device_status || hdr->transport_status || hdr->driver_status)
418 hdr->info |= SG_INFO_CHECK;
419 hdr->din_resid = rq->data_len;
420 hdr->response_len = 0;
422 if (rq->sense_len && hdr->response) {
423 int len = min((unsigned int) hdr->max_response_len,
426 ret = copy_to_user((void*)(unsigned long)hdr->response,
429 hdr->response_len = len;
434 blk_rq_unmap_user(bio);
440 static int bsg_complete_all_commands(struct bsg_device *bd)
442 struct bsg_command *bc;
445 dprintk("%s: entered\n", bd->name);
447 set_bit(BSG_F_BLOCK, &bd->flags);
450 * wait for all commands to complete
454 ret = bsg_io_schedule(bd, TASK_UNINTERRUPTIBLE);
456 * look for -ENODATA specifically -- we'll sometimes get
457 * -ERESTARTSYS when we've taken a signal, but we can't
458 * return until we're done freeing the queue, so ignore
459 * it. The signal will get handled when we're done freeing
462 } while (ret != -ENODATA);
465 * discard done commands
469 spin_lock_irq(&bd->lock);
470 if (!bd->queued_cmds) {
471 spin_unlock_irq(&bd->lock);
475 bc = bsg_get_done_cmd(bd);
479 tret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio);
483 bsg_free_command(bc);
490 __bsg_read(char __user *buf, size_t count, struct bsg_device *bd,
491 const struct iovec *iov, ssize_t *bytes_read)
493 struct bsg_command *bc;
494 int nr_commands, ret;
496 if (count % sizeof(struct sg_io_v4))
500 nr_commands = count / sizeof(struct sg_io_v4);
501 while (nr_commands) {
502 bc = bsg_get_done_cmd(bd);
509 * this is the only case where we need to copy data back
510 * after completing the request. so do that here,
511 * bsg_complete_work() cannot do that for us
513 ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio);
515 if (copy_to_user(buf, (char *) &bc->hdr, sizeof(bc->hdr)))
518 bsg_free_command(bc);
523 buf += sizeof(struct sg_io_v4);
524 *bytes_read += sizeof(struct sg_io_v4);
531 static inline void bsg_set_block(struct bsg_device *bd, struct file *file)
533 if (file->f_flags & O_NONBLOCK)
534 clear_bit(BSG_F_BLOCK, &bd->flags);
536 set_bit(BSG_F_BLOCK, &bd->flags);
539 static inline void bsg_set_write_perm(struct bsg_device *bd, struct file *file)
541 if (file->f_mode & FMODE_WRITE)
542 set_bit(BSG_F_WRITE_PERM, &bd->flags);
544 clear_bit(BSG_F_WRITE_PERM, &bd->flags);
547 static inline int err_block_err(int ret)
549 if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN)
556 bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
558 struct bsg_device *bd = file->private_data;
562 dprintk("%s: read %Zd bytes\n", bd->name, count);
564 bsg_set_block(bd, file);
566 ret = __bsg_read(buf, count, bd, NULL, &bytes_read);
569 if (!bytes_read || (bytes_read && err_block_err(ret)))
575 static ssize_t __bsg_write(struct bsg_device *bd, const char __user *buf,
576 size_t count, ssize_t *bytes_read)
578 struct bsg_command *bc;
580 int ret, nr_commands;
582 if (count % sizeof(struct sg_io_v4))
585 nr_commands = count / sizeof(struct sg_io_v4);
589 while (nr_commands) {
590 request_queue_t *q = bd->queue;
592 bc = bsg_alloc_command(bd);
599 bc->uhdr = (struct sg_io_v4 __user *) buf;
600 if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) {
606 * get a request, fill in the blanks, and add to request queue
608 rq = bsg_map_hdr(bd, &bc->hdr);
615 bsg_add_command(bd, q, bc, rq);
619 buf += sizeof(struct sg_io_v4);
620 *bytes_read += sizeof(struct sg_io_v4);
624 bsg_free_command(bc);
630 bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
632 struct bsg_device *bd = file->private_data;
636 dprintk("%s: write %Zd bytes\n", bd->name, count);
638 bsg_set_block(bd, file);
639 bsg_set_write_perm(bd, file);
642 ret = __bsg_write(bd, buf, count, &bytes_read);
646 * return bytes written on non-fatal errors
648 if (!bytes_read || (bytes_read && err_block_err(ret)))
651 dprintk("%s: returning %Zd\n", bd->name, bytes_read);
655 static struct bsg_device *bsg_alloc_device(void)
657 struct bsg_device *bd;
659 bd = kzalloc(sizeof(struct bsg_device), GFP_KERNEL);
663 spin_lock_init(&bd->lock);
665 bd->max_queue = BSG_DEFAULT_CMDS;
667 INIT_LIST_HEAD(&bd->busy_list);
668 INIT_LIST_HEAD(&bd->done_list);
669 INIT_HLIST_NODE(&bd->dev_list);
671 init_waitqueue_head(&bd->wq_free);
672 init_waitqueue_head(&bd->wq_done);
676 static int bsg_put_device(struct bsg_device *bd)
680 mutex_lock(&bsg_mutex);
682 if (!atomic_dec_and_test(&bd->ref_count))
685 dprintk("%s: tearing down\n", bd->name);
688 * close can always block
690 set_bit(BSG_F_BLOCK, &bd->flags);
693 * correct error detection baddies here again. it's the responsibility
694 * of the app to properly reap commands before close() if it wants
695 * fool-proof error detection
697 ret = bsg_complete_all_commands(bd);
699 blk_put_queue(bd->queue);
700 hlist_del(&bd->dev_list);
703 mutex_unlock(&bsg_mutex);
707 static struct bsg_device *bsg_add_device(struct inode *inode,
708 struct request_queue *rq,
711 struct bsg_device *bd = NULL;
713 unsigned char buf[32];
716 bd = bsg_alloc_device();
718 return ERR_PTR(-ENOMEM);
721 kobject_get(&rq->kobj);
722 bsg_set_block(bd, file);
724 atomic_set(&bd->ref_count, 1);
725 bd->minor = iminor(inode);
726 mutex_lock(&bsg_mutex);
727 hlist_add_head(&bd->dev_list, &bsg_device_list[bsg_list_idx(bd->minor)]);
729 strncpy(bd->name, rq->bsg_dev.class_dev->class_id, sizeof(bd->name) - 1);
730 dprintk("bound to <%s>, max queue %d\n",
731 format_dev_t(buf, inode->i_rdev), bd->max_queue);
733 mutex_unlock(&bsg_mutex);
737 static struct bsg_device *__bsg_get_device(int minor)
739 struct hlist_head *list = &bsg_device_list[bsg_list_idx(minor)];
740 struct bsg_device *bd = NULL;
741 struct hlist_node *entry;
743 mutex_lock(&bsg_mutex);
745 hlist_for_each(entry, list) {
746 bd = hlist_entry(entry, struct bsg_device, dev_list);
747 if (bd->minor == minor) {
748 atomic_inc(&bd->ref_count);
755 mutex_unlock(&bsg_mutex);
759 static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file)
761 struct bsg_device *bd = __bsg_get_device(iminor(inode));
762 struct bsg_class_device *bcd, *__bcd;
768 * find the class device
771 mutex_lock(&bsg_mutex);
772 list_for_each_entry(__bcd, &bsg_class_list, list) {
773 if (__bcd->minor == iminor(inode)) {
778 mutex_unlock(&bsg_mutex);
781 return ERR_PTR(-ENODEV);
783 return bsg_add_device(inode, bcd->queue, file);
786 static int bsg_open(struct inode *inode, struct file *file)
788 struct bsg_device *bd = bsg_get_device(inode, file);
793 file->private_data = bd;
797 static int bsg_release(struct inode *inode, struct file *file)
799 struct bsg_device *bd = file->private_data;
801 file->private_data = NULL;
802 return bsg_put_device(bd);
805 static unsigned int bsg_poll(struct file *file, poll_table *wait)
807 struct bsg_device *bd = file->private_data;
808 unsigned int mask = 0;
810 poll_wait(file, &bd->wq_done, wait);
811 poll_wait(file, &bd->wq_free, wait);
813 spin_lock_irq(&bd->lock);
814 if (!list_empty(&bd->done_list))
815 mask |= POLLIN | POLLRDNORM;
816 if (bd->queued_cmds >= bd->max_queue)
818 spin_unlock_irq(&bd->lock);
824 bsg_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
827 struct bsg_device *bd = file->private_data;
828 int __user *uarg = (int __user *) arg;
837 case SG_GET_COMMAND_Q:
838 return put_user(bd->max_queue, uarg);
839 case SG_SET_COMMAND_Q: {
842 if (get_user(queue, uarg))
847 spin_lock_irq(&bd->lock);
848 bd->max_queue = queue;
849 spin_unlock_irq(&bd->lock);
856 case SG_GET_VERSION_NUM:
857 case SCSI_IOCTL_GET_IDLUN:
858 case SCSI_IOCTL_GET_BUS_NUMBER:
861 case SG_GET_RESERVED_SIZE:
862 case SG_SET_RESERVED_SIZE:
863 case SG_EMULATED_HOST:
864 case SCSI_IOCTL_SEND_COMMAND: {
865 void __user *uarg = (void __user *) arg;
866 return scsi_cmd_ioctl(file, bd->queue, NULL, cmd, uarg);
873 if (copy_from_user(&hdr, uarg, sizeof(hdr)))
876 rq = bsg_map_hdr(bd, &hdr);
881 blk_execute_rq(bd->queue, NULL, rq, 0);
882 blk_complete_sgv4_hdr_rq(rq, &hdr, bio);
884 if (copy_to_user(uarg, &hdr, sizeof(hdr)))
890 * block device ioctls
894 return ioctl_by_bdev(bd->bdev, cmd, arg);
901 static struct file_operations bsg_fops = {
906 .release = bsg_release,
908 .owner = THIS_MODULE,
911 void bsg_unregister_queue(struct request_queue *q)
913 struct bsg_class_device *bcd = &q->bsg_dev;
918 mutex_lock(&bsg_mutex);
919 sysfs_remove_link(&q->kobj, "bsg");
920 class_device_destroy(bsg_class, MKDEV(BSG_MAJOR, bcd->minor));
921 bcd->class_dev = NULL;
922 list_del_init(&bcd->list);
924 mutex_unlock(&bsg_mutex);
926 EXPORT_SYMBOL_GPL(bsg_unregister_queue);
928 int bsg_register_queue(struct request_queue *q, const char *name)
930 struct bsg_class_device *bcd, *__bcd;
933 struct class_device *class_dev = NULL;
936 * we need a proper transport to send commands, not a stacked device
942 memset(bcd, 0, sizeof(*bcd));
943 INIT_LIST_HEAD(&bcd->list);
945 mutex_lock(&bsg_mutex);
946 if (bsg_device_nr == BSG_MAX_DEVS) {
947 printk(KERN_ERR "bsg: too many bsg devices\n");
952 list_for_each_entry(__bcd, &bsg_class_list, list) {
953 if (__bcd->minor == bsg_minor_idx) {
955 if (bsg_minor_idx == BSG_MAX_DEVS)
961 bcd->minor = bsg_minor_idx++;
962 if (bsg_minor_idx == BSG_MAX_DEVS)
966 dev = MKDEV(BSG_MAJOR, bcd->minor);
967 class_dev = class_device_create(bsg_class, NULL, dev, bcd->dev, "%s", name);
968 if (IS_ERR(class_dev)) {
969 ret = PTR_ERR(class_dev);
972 bcd->class_dev = class_dev;
974 if (q->kobj.dentry) {
975 ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg");
980 list_add_tail(&bcd->list, &bsg_class_list);
983 mutex_unlock(&bsg_mutex);
987 class_device_destroy(bsg_class, MKDEV(BSG_MAJOR, bcd->minor));
988 mutex_unlock(&bsg_mutex);
991 EXPORT_SYMBOL_GPL(bsg_register_queue);
993 static int bsg_add(struct class_device *cl_dev, struct class_interface *cl_intf)
996 struct scsi_device *sdp = to_scsi_device(cl_dev->dev);
997 struct request_queue *rq = sdp->request_queue;
1000 ret = bsg_register_queue(rq, kobject_name(rq->kobj.parent));
1002 ret = bsg_register_queue(rq, kobject_name(&sdp->sdev_gendev.kobj));
1006 static void bsg_remove(struct class_device *cl_dev, struct class_interface *cl_intf)
1008 bsg_unregister_queue(to_scsi_device(cl_dev->dev)->request_queue);
1011 static struct class_interface bsg_intf = {
1013 .remove = bsg_remove,
1016 static struct cdev bsg_cdev = {
1017 .kobj = {.name = "bsg", },
1018 .owner = THIS_MODULE,
1021 static int __init bsg_init(void)
1025 bsg_cmd_cachep = kmem_cache_create("bsg_cmd",
1026 sizeof(struct bsg_command), 0, 0, NULL, NULL);
1027 if (!bsg_cmd_cachep) {
1028 printk(KERN_ERR "bsg: failed creating slab cache\n");
1032 for (i = 0; i < BSG_LIST_SIZE; i++)
1033 INIT_HLIST_HEAD(&bsg_device_list[i]);
1035 bsg_class = class_create(THIS_MODULE, "bsg");
1036 if (IS_ERR(bsg_class)) {
1037 kmem_cache_destroy(bsg_cmd_cachep);
1038 return PTR_ERR(bsg_class);
1041 ret = register_chrdev_region(MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS, "bsg");
1043 kmem_cache_destroy(bsg_cmd_cachep);
1044 class_destroy(bsg_class);
1048 cdev_init(&bsg_cdev, &bsg_fops);
1049 ret = cdev_add(&bsg_cdev, MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS);
1051 kmem_cache_destroy(bsg_cmd_cachep);
1052 class_destroy(bsg_class);
1053 unregister_chrdev_region(MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS);
1057 ret = scsi_register_interface(&bsg_intf);
1059 printk(KERN_ERR "bsg: failed register scsi interface %d\n", ret);
1060 kmem_cache_destroy(bsg_cmd_cachep);
1061 class_destroy(bsg_class);
1062 unregister_chrdev(BSG_MAJOR, "bsg");
1066 printk(KERN_INFO "%s loaded\n", bsg_version);
1070 MODULE_AUTHOR("Jens Axboe");
1071 MODULE_DESCRIPTION("Block layer SGSI generic (sg) driver");
1072 MODULE_LICENSE("GPL");
1074 device_initcall(bsg_init);