diff options
| author | Tejun Heo <tj@kernel.org> | 2013-02-27 17:03:56 -0800 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-03-06 03:24:16 +0000 |
| commit | a51db52c68e3ad5c718c1915d28086b2c0ef8642 (patch) | |
| tree | 3380212a171f9af3855eb93239f9e39f75601aa6 /block | |
| parent | 18536d611e05f6141504c7029943967ea3b56ba7 (diff) | |
block: fix synchronization and limit check in blk_alloc_devt()
commit ce23bba842aee98092225d9576dba47c82352521 upstream.
idr allocation in blk_alloc_devt() wasn't synchronized against lookup
and removal, and its limit check was off by one - 1 << MINORBITS is
the number of minors allowed, not the maximum allowed minor.
Add locking and rename MAX_EXT_DEVT to NR_EXT_DEVT and fix limit
checking.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/genhd.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/block/genhd.c b/block/genhd.c index ac9aeb4b9ed0..6edf2284b276 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -26,7 +26,7 @@ static DEFINE_MUTEX(block_class_lock); struct kobject *block_depr; /* for extended dynamic devt allocation, currently only one major is used */ -#define MAX_EXT_DEVT (1 << MINORBITS) +#define NR_EXT_DEVT (1 << MINORBITS) /* For extended devt allocation. ext_devt_mutex prevents look up * results from going away underneath its user. @@ -423,19 +423,16 @@ int blk_alloc_devt(struct hd_struct *part, dev_t *devt) return -ENOMEM; mutex_lock(&ext_devt_mutex); rc = idr_get_new(&ext_devt_idr, part, &idx); + if (!rc && idx >= NR_EXT_DEVT) { + idr_remove(&ext_devt_idr, idx); + rc = -EBUSY; + } mutex_unlock(&ext_devt_mutex); } while (rc == -EAGAIN); if (rc) return rc; - if (idx > MAX_EXT_DEVT) { - mutex_lock(&ext_devt_mutex); - idr_remove(&ext_devt_idr, idx); - mutex_unlock(&ext_devt_mutex); - return -EBUSY; - } - *devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx)); return 0; } |