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[SCSI] SCSI sd: fix module init/exit error handling 

- Properly handle and unwind errors in init_sd().  Fixes leaks on error,
  if class_register() or scsi_register_driver() failed.

- Ensure that exit_sd() execution order is the perfect inverse of
  initialization order.

FIXME:  If some-but-not-all register_blkdev() calls fail, we wind up
calling unregister_blkdev() for block devices we did not register.
This was a pre-existing bug.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Jeff Garzik 2006-10-04 05:32:54 -04:00 committed by James Bottomley
parent 37e0333c68
commit 5e4009ba3d
1 changed files with 18 additions and 5 deletions
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23
drivers/scsi/sd.c
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@ -1795,7 +1795,7 @@ static void sd_shutdown(struct device *dev)
**/
static int __init init_sd(void)
{
int majors = 0, i;
int majors = 0, i, err;
SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
@ -1806,9 +1806,22 @@ static int __init init_sd(void)
if (!majors)
return -ENODEV;
class_register(&sd_disk_class);
err = class_register(&sd_disk_class);
if (err)
goto err_out;
return scsi_register_driver(&sd_template.gendrv);
err = scsi_register_driver(&sd_template.gendrv);
if (err)
goto err_out_class;
return 0;
err_out_class:
class_unregister(&sd_disk_class);
err_out:
for (i = 0; i < SD_MAJORS; i++)
unregister_blkdev(sd_major(i), "sd");
return err;
}
/**
@ -1823,10 +1836,10 @@ static void __exit exit_sd(void)
SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
scsi_unregister_driver(&sd_template.gendrv);
class_unregister(&sd_disk_class);
for (i = 0; i < SD_MAJORS; i++)
unregister_blkdev(sd_major(i), "sd");
class_unregister(&sd_disk_class);
}
module_init(init_sd);