[PATCH 031/270] block: fix request_queue->flags initialization

[Herton Ronaldo Krzesinski]

3.5.7u1 -stable review patch.  If anyone has any objections, please let me know.

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

From: Tejun Heo <tj at kernel.org>

commit 60ea8226cbd5c8301f9a39edc574ddabcb8150e0 upstream.

A queue newly allocated with blk_alloc_queue_node() has only
QUEUE_FLAG_BYPASS set.  For request-based drivers,
blk_init_allocated_queue() is called and q->queue_flags is overwritten
with QUEUE_FLAG_DEFAULT which doesn't include BYPASS even though the
initial bypass is still in effect.

In blk_init_allocated_queue(), or QUEUE_FLAG_DEFAULT to q->queue_flags
instead of overwriting.

Signed-off-by: Tejun Heo <tj at kernel.org>
Acked-by: Vivek Goyal <vgoyal at redhat.com>
Signed-off-by: Jens Axboe <axboe at kernel.dk>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
---
 block/blk-core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 96335a7..e17ce4b 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -686,7 +686,7 @@ blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn,
 	q->request_fn		= rfn;
 	q->prep_rq_fn		= NULL;
 	q->unprep_rq_fn		= NULL;
-	q->queue_flags		= QUEUE_FLAG_DEFAULT;
+	q->queue_flags		|= QUEUE_FLAG_DEFAULT;
 
 	/* Override internal queue lock with supplied lock pointer */
 	if (lock)
-- 
1.7.9.5