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bcache: Fix a shrinker deadlock

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GFP_NOIO means we could be getting called recursively - mca_alloc() ->
mca_data_alloc() - definitely can't use mutex_lock(bucket_lock) then.
Whoops.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: linux-stable <stable@vger.kernel.org> # >= v3.10
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kent Overstreet 2013-09-23 23:17:34 -07:00 committed by Linus Torvalds
parent 79e3dab90d
commit a698e08c82
1 changed files with 1 additions and 1 deletions
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2
drivers/md/bcache/btree.c
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@ -612,7 +612,7 @@ static unsigned long bch_mca_scan(struct shrinker *shrink,
return SHRINK_STOP;
/* Return -1 if we can't do anything right now */
if (sc->gfp_mask & __GFP_WAIT)
if (sc->gfp_mask & __GFP_IO)
mutex_lock(&c->bucket_lock);
else if (!mutex_trylock(&c->bucket_lock))
return -1;