From 3b632cf0eaa2e89a12c18f043e6e7c5bcc003645 Mon Sep 17 00:00:00 2001 From: Keith Busch Date: Fri, 6 Jun 2014 10:22:07 -0600 Subject: [PATCH] blk-mq: don't allow queue entering for a dying queue If the queue is going away, don't let new allocs or queueing happen on it. Go through the normal wait process, and exit with ENODEV in that case. Signed-off-by: Keith Busch Signed-off-by: Jens Axboe --- block/blk-mq.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index a6ee74e27957..75fc33f34251 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -82,8 +82,10 @@ static int blk_mq_queue_enter(struct request_queue *q) __percpu_counter_add(&q->mq_usage_counter, 1, 1000000); smp_wmb(); - /* we have problems to freeze the queue if it's initializing */ - if (!blk_queue_bypass(q) || !blk_queue_init_done(q)) + + /* we have problems freezing the queue if it's initializing */ + if (!blk_queue_dying(q) && + (!blk_queue_bypass(q) || !blk_queue_init_done(q))) return 0; __percpu_counter_add(&q->mq_usage_counter, -1, 1000000);