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| author | Milan Broz <mbroz@redhat.com> | 2011-01-13 20:59:48 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2011-01-13 20:59:48 +0100 |
| commit | 4a1aeb98297e17f4e0a8cdda919e63bf528b2e5d (patch) | |
| tree | 4709346914cbdab86200c59241262d0ea2cbd204 /drivers/md/dm.c | |
| parent | dm raid1: support discard (diff) | |
| download | linux-4a1aeb98297e17f4e0a8cdda919e63bf528b2e5d.tar.xz linux-4a1aeb98297e17f4e0a8cdda919e63bf528b2e5d.zip | |
dm: remove dm_mutex after bkl conversion
This patch replaces dm_mutex with _minor_lock in dm_blk_close()
and then removes it.
During the BKL conversion, commit 6e9624b8caec290d28b4c6d9ec75749df6372b87
(block: push down BKL into .open and .release) pushed lock_kernel()
down into dm_blk_open/close calls.
Commit 2a48fc0ab24241755dc93bfd4f01d68efab47f5a
(block: autoconvert trivial BKL users to private mutex) converted it to a
local mutex, but _minor_lock is sufficient.
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm.c')
| -rw-r--r-- | drivers/md/dm.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 4ef066a3090f..0de692176ad4 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -32,7 +32,6 @@ #define DM_COOKIE_ENV_VAR_NAME "DM_COOKIE" #define DM_COOKIE_LENGTH 24 -static DEFINE_MUTEX(dm_mutex); static const char *_name = DM_NAME; static unsigned int major = 0; @@ -328,7 +327,6 @@ static int dm_blk_open(struct block_device *bdev, fmode_t mode) { struct mapped_device *md; - mutex_lock(&dm_mutex); spin_lock(&_minor_lock); md = bdev->bd_disk->private_data; @@ -346,7 +344,6 @@ static int dm_blk_open(struct block_device *bdev, fmode_t mode) out: spin_unlock(&_minor_lock); - mutex_unlock(&dm_mutex); return md ? 0 : -ENXIO; } @@ -355,10 +352,12 @@ static int dm_blk_close(struct gendisk *disk, fmode_t mode) { struct mapped_device *md = disk->private_data; - mutex_lock(&dm_mutex); + spin_lock(&_minor_lock); + atomic_dec(&md->open_count); dm_put(md); - mutex_unlock(&dm_mutex); + + spin_unlock(&_minor_lock); return 0; } |