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| author | Jeff Dike <jdike@addtoit.com> | 2007-05-06 14:51:01 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-07 12:13:00 -0700 |
| commit | b47d2debf229469c78af4145ee7ad35a0f21b67f (patch) | |
| tree | 6bca064260d56701b799282b40586277278996b4 /arch/um/drivers | |
| parent | 1d94cda04eb82feb87c932ac3d4aef1e9dc78a43 (diff) | |
| download | linux-b47d2debf229469c78af4145ee7ad35a0f21b67f.tar.gz linux-b47d2debf229469c78af4145ee7ad35a0f21b67f.tar.bz2 linux-b47d2debf229469c78af4145ee7ad35a0f21b67f.zip | |
uml: handle block device hotplug errors
If a disk fails to open, i.e. its host file doesn't exist, it won't be
removable because the hot-unplug code checks the existence of its gendisk.
This won't exist because it is only allocated for successfully opened disks.
Thus, a typo on the command line can result in a unusable and unfixable disk.
This is fixed by freeing the gendisk if it's there, but not letting that
affect the removal.
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/drivers')
| -rw-r--r-- | arch/um/drivers/ubd_kern.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c index 8bd9204ac1ab..53c36d1770c5 100644 --- a/arch/um/drivers/ubd_kern.c +++ b/arch/um/drivers/ubd_kern.c @@ -788,14 +788,12 @@ static int ubd_id(char **str, int *start_out, int *end_out) static int ubd_remove(int n, char **error_out) { + struct gendisk *disk; struct ubd *ubd_dev; int err = -ENODEV; mutex_lock(&ubd_lock); - if(ubd_gendisk[n] == NULL) - goto out; - ubd_dev = &ubd_devs[n]; if(ubd_dev->file == NULL) @@ -806,9 +804,12 @@ static int ubd_remove(int n, char **error_out) if(ubd_dev->count > 0) goto out; - del_gendisk(ubd_gendisk[n]); - put_disk(ubd_gendisk[n]); - ubd_gendisk[n] = NULL; + disk = ubd_gendisk[n]; + ubd_gendisk[n] = NULL; + if(disk != NULL){ + del_gendisk(disk); + put_disk(disk); + } if(fake_gendisk[n] != NULL){ del_gendisk(fake_gendisk[n]); |