blk-timeout: fix blk_add_timer

Commit 8cb34819cdd5d(blk-mq: unshared timeout handler) introduces
blk-mq's own timeout handler, and removes following line:

	blk_queue_rq_timed_out(q, blk_mq_rq_timed_out);

which then causes blk_add_timer() to bypass adding the timer,
since blk-mq no longer has q->rq_timed_out_fn defined.

This patch fixes the problem by bypassing the check for blk-mq,
so that both request deadlines are still set and the rolling
timer updated.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/block/blk-timeout.c b/block/blk-timeout.c
index 4d44825..8bae410 100644 (file)
--- a/block/blk-timeout.c
+++ b/block/blk-timeout.c
@@ -186,7 +186,8 @@ void blk_add_timer(struct request *req)
        struct request_queue *q = req->q;
        unsigned long expiry;
 
-       if (!q->rq_timed_out_fn)
+       /* blk-mq has its own handler, so we don't need ->rq_timed_out_fn */
+       if (!q->mq_ops && !q->rq_timed_out_fn)
                return;
 
        BUG_ON(!list_empty(&req->timeout_list));