This is a note to let you know that I've just added the patch titled

block: wake up all tasks blocked in get_request()

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: block-wake-up-all-tasks-blocked-in-get_request.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Tue Dec 12 10:32:42 CET 2017

From: Ming Lei ming.lei@redhat.com Date: Thu, 16 Nov 2017 08:08:44 +0800 Subject: block: wake up all tasks blocked in get_request()

From: Ming Lei ming.lei@redhat.com

[ Upstream commit 34d9715ac1edd50285168dd8d80c972739a4f6a4 ]

Once blk_set_queue_dying() is done in blk_cleanup_queue(), we call blk_freeze_queue() and wait for q->q_usage_counter becoming zero. But if there are tasks blocked in get_request(), q->q_usage_counter can never become zero. So we have to wake up all these tasks in blk_set_queue_dying() first.

Fixes: 3ef28e83ab157997 ("block: generic request_queue reference counting") Signed-off-by: Ming Lei ming.lei@redhat.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- block/blk-core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/block/blk-core.c +++ b/block/blk-core.c @@ -605,8 +605,8 @@ void blk_set_queue_dying(struct request_ spin_lock_irq(q->queue_lock); blk_queue_for_each_rl(rl, q) { if (rl->rq_pool) { - wake_up(&rl->wait[BLK_RW_SYNC]); - wake_up(&rl->wait[BLK_RW_ASYNC]); + wake_up_all(&rl->wait[BLK_RW_SYNC]); + wake_up_all(&rl->wait[BLK_RW_ASYNC]); } } spin_unlock_irq(q->queue_lock);

Patches currently in stable-queue which might be from ming.lei@redhat.com are

queue-4.14/block-wake-up-all-tasks-blocked-in-get_request.patch