block: fix request_queue->flags initialization

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@kernel.org>
Cc: stable@vger.kernel.org
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-core.c b/block/blk-core.c
index 80e29c90723c26bce5bf3bdb296077530e80e038..a17869f337f7377943e1a1d9fbde6d3d48d94248 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -696,7 +696,7 @@ 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)