From 1bf7f1c641c7c83b9ed9099c5da4e6011e1664e2 Mon Sep 17 00:00:00 2001 From: Tetsuo Handa Date: Wed, 30 Jan 2019 22:21:45 +0900 Subject: [PATCH] block: pass no-op callback to INIT_WORK(). BugLink: https://bugs.launchpad.net/bugs/1838459 [ Upstream commit 2e3c18d0ada16f145087b2687afcad1748c0827c ] syzbot is hitting flush_work() warning caused by commit 4d43d395fed12463 ("workqueue: Try to catch flush_work() without INIT_WORK().") [1]. Although that commit did not expect INIT_WORK(NULL) case, calling flush_work() without setting a valid callback should be avoided anyway. Fix this problem by setting a no-op callback instead of NULL. [1] https://syzkaller.appspot.com/bug?id=e390366bc48bc82a7c668326e0663be3b91cbd29 Signed-off-by: Tetsuo Handa Reported-and-tested-by: syzbot Cc: Tejun Heo Signed-off-by: Jens Axboe [sl: rename blk_timeout_work] Signed-off-by: Sasha Levin Signed-off-by: Kamal Mostafa Signed-off-by: Khalid Elmously --- block/blk-core.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/block/blk-core.c b/block/blk-core.c index e7dde068580a..6b2ca92ff39d 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -884,6 +884,10 @@ static void blk_rq_timed_out_timer(struct timer_list *t) kblockd_schedule_work(&q->timeout_work); } +static void blk_timeout_work_dummy(struct work_struct *work) +{ +} + struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id) { struct request_queue *q; @@ -918,7 +922,7 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id) timer_setup(&q->backing_dev_info->laptop_mode_wb_timer, laptop_mode_timer_fn, 0); timer_setup(&q->timeout, blk_rq_timed_out_timer, 0); - INIT_WORK(&q->timeout_work, NULL); + INIT_WORK(&q->timeout_work, blk_timeout_work_dummy); INIT_LIST_HEAD(&q->queue_head); INIT_LIST_HEAD(&q->timeout_list); INIT_LIST_HEAD(&q->icq_list); -- 2.39.2