From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from esa2.hgst.iphmx.com ([68.232.143.124]:65401 "EHLO esa2.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751969AbdJSRA4 (ORCPT ); Thu, 19 Oct 2017 13:00:56 -0400 From: Bart Van Assche To: Jens Axboe Cc: linux-block@vger.kernel.org, Christoph Hellwig , Bart Van Assche , Keith Busch , Hannes Reinecke , Ming Lei , Johannes Thumshirn , stable@vger.kernel.org Subject: [PATCH] block: Fix a race between blk_cleanup_queue() and timeout handling Date: Thu, 19 Oct 2017 10:00:48 -0700 Message-Id: <20171019170048.16044-1-bart.vanassche@wdc.com> Sender: stable-owner@vger.kernel.org List-ID: 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) Fixes: commit 287922eb0b18 ("block: defer timeouts to a workqueue") Signed-off-by: Bart Van Assche Tested-by: chenxiang (M) Cc: Christoph Hellwig Cc: Keith Busch Cc: Hannes Reinecke Cc: Ming Lei Cc: Johannes Thumshirn Cc: --- block/blk-core.c | 2 ++ block/blk-timeout.c | 3 --- 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index e8e149ccc86b..bb4fce694a60 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -333,6 +333,7 @@ EXPORT_SYMBOL(blk_stop_queue); 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; @@ -844,6 +845,7 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id) 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); diff --git a/block/blk-timeout.c b/block/blk-timeout.c index e3e9c9771d36..764ecf9aeb30 100644 --- a/block/blk-timeout.c +++ b/block/blk-timeout.c @@ -134,8 +134,6 @@ void blk_timeout_work(struct work_struct *work) struct request *rq, *tmp; int next_set = 0; - if (blk_queue_enter(q, true)) - return; spin_lock_irqsave(q->queue_lock, flags); list_for_each_entry_safe(rq, tmp, &q->timeout_list, timeout_list) @@ -145,7 +143,6 @@ void blk_timeout_work(struct work_struct *work) mod_timer(&q->timeout, round_jiffies_up(next)); spin_unlock_irqrestore(q->queue_lock, flags); - blk_queue_exit(q); } /** -- 2.14.2