From 3fd5940cb2e47a61dcff4108f39be4c72cb4dace Mon Sep 17 00:00:00 2001 From: Keith Busch Date: Thu, 8 Jan 2015 08:53:56 -0700 Subject: blk-mq: Wake tasks entering queue on dying When the queue is set to dying, wake up tasks that are waiting on frozen queue so they realize it is dying and abandon their request. Signed-off-by: Keith Busch Modified by me to add a code comment on the need for the wakeup. Signed-off-by: Jens Axboe --- block/blk-mq.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'block') diff --git a/block/blk-mq.c b/block/blk-mq.c index cbd2a55d69b8..aefed96369dd 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -160,6 +160,13 @@ void blk_mq_wake_waiters(struct request_queue *q) queue_for_each_hw_ctx(q, hctx, i) if (blk_mq_hw_queue_mapped(hctx)) blk_mq_tag_wakeup_all(hctx->tags, true); + + /* + * If we are called because the queue has now been marked as + * dying, we need to ensure that processes currently waiting on + * the queue are notified as well. + */ + wake_up_all(&q->mq_freeze_wq); } bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx) -- cgit v1.2.3