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dm cache metadata: fix cmd_read_lock() acquiring write lock 

Commit 9567366fef ("dm cache metadata: fix READ_LOCK macros and
cleanup WRITE_LOCK macros") uses down_write() instead of down_read() in
cmd_read_lock(), yet up_read() is used to release the lock in
READ_UNLOCK().  Fix it.

Fixes: 9567366fef ("dm cache metadata: fix READ_LOCK macros and cleanup WRITE_LOCK macros")
Cc: stable@vger.kernel.org
Signed-off-by: Ahmed Samy <f.fallen45@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Ahmed Samy 2016-04-17 05:37:09 +00:00 committed by Mike Snitzer
parent 9567366fef
commit 6545b60baa
1 changed files with 2 additions and 2 deletions
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4
drivers/md/dm-cache-metadata.c
View File

@ -894,9 +894,9 @@ static bool cmd_write_lock(struct dm_cache_metadata *cmd)
static bool cmd_read_lock(struct dm_cache_metadata *cmd)
{
down_write(&cmd->root_lock);
down_read(&cmd->root_lock);
if (cmd->fail_io) {
up_write(&cmd->root_lock);
up_read(&cmd->root_lock);
return false;
}
return true;