linux-kernel - [PATCH 3.14 91/98] bcache: Make sure to pass GFP_WAIT to mempool

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Message-Id: <20150125180716.850844636@linuxfoundation.org>
Date:	Sun, 25 Jan 2015 10:07:49 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Kent Overstreet <kmo@...erainc.com>,
	Gabriel de Perthuis <g2p.code@...il.com>
Subject: [PATCH 3.14 91/98] bcache: Make sure to pass GFP_WAIT to mempool_alloc()

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kent Overstreet <kmo@...erainc.com>

commit bcf090e0040e30f8409e6a535a01e6473afb096f upstream.

this was very wrong - mempool_alloc() only guarantees success with GFP_WAIT.
bcache uses GFP_NOWAIT in various other places where we have a fallback,
circuits must've gotten crossed when writing this code or something.

Signed-off-by: Kent Overstreet <kmo@...erainc.com>
Cc: Gabriel de Perthuis <g2p.code@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/bcache/btree.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -199,7 +199,7 @@ void bch_btree_node_read_done(struct btr
 	struct bset *i = btree_bset_first(b);
 	struct btree_iter *iter;
 
-	iter = mempool_alloc(b->c->fill_iter, GFP_NOWAIT);
+	iter = mempool_alloc(b->c->fill_iter, GFP_NOIO);
 	iter->size = b->c->sb.bucket_size / b->c->sb.block_size;
 	iter->used = 0;
 


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