From 6545b60baaf880b0cd29a5e89dbe745a06027e89 Mon Sep 17 00:00:00 2001
From: Ahmed Samy <f.fallen45@gmail.com>
Date: Sun, 17 Apr 2016 05:37:09 +0000
Subject: [PATCH] dm cache metadata: fix cmd_read_lock() acquiring write lock
Commit 9567366fefdd ("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: 9567366fefdd ("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>
---
drivers/md/dm-cache-metadata.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/md/dm-cache-metadata.c b/drivers/md/dm-cache-metadata.c
index 65ce6985f87a..3970cda10080 100644
--- a/drivers/md/dm-cache-metadata.c
+++ b/drivers/md/dm-cache-metadata.c
@@ -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;
--
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