block: Fix a race between blk_cleanup_queue() and timeout handling
commit 4e9b6f20828ac880dbc1fa2fdbafae779473d1af upstream.
Make sure that if the timeout timer fires after a queue has been
marked "dying" that the affected requests are finished.
Reported-by: chenxiang (M) <chenxiang66@hisilicon.com>
Fixes: commit 287922eb0b18 ("block: defer timeouts to a workqueue")
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Tested-by: chenxiang (M) <chenxiang66@hisilicon.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/block/blk-core.c b/block/blk-core.c
index 95379fc..b1c76aa 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -282,6 +282,7 @@
void blk_sync_queue(struct request_queue *q)
{
del_timer_sync(&q->timeout);
+ cancel_work_sync(&q->timeout_work);
if (q->mq_ops) {
struct blk_mq_hw_ctx *hctx;
@@ -720,6 +721,7 @@
setup_timer(&q->backing_dev_info.laptop_mode_wb_timer,
laptop_mode_timer_fn, (unsigned long) q);
setup_timer(&q->timeout, blk_rq_timed_out_timer, (unsigned long) q);
+ INIT_WORK(&q->timeout_work, NULL);
INIT_LIST_HEAD(&q->queue_head);
INIT_LIST_HEAD(&q->timeout_list);
INIT_LIST_HEAD(&q->icq_list);