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| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2019-01-30 16:21:45 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-08 08:21:51 +0300 |
| commit | 96e4471d3881206054f033b7c272be7cb09f1e4b (patch) | |
| tree | 6ab04f6374e3702bd77e12a7e0f7db46ca8cbf64 | |
| parent | 14f3c36b47ed994b58b033e2d574b520675e6ef8 (diff) | |
| download | linux-96e4471d3881206054f033b7c272be7cb09f1e4b.tar.xz | |
block: pass no-op callback to INIT_WORK().
[ 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 <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-and-tested-by: syzbot <syzbot+ba2a929dcf8e704c180e@syzkaller.appspotmail.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
[sl: rename blk_timeout_work]
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | block/blk-core.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index eb8b52241453..33488b1426b7 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -980,6 +980,10 @@ 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) +{ +} + /** * blk_alloc_queue_node - allocate a request queue * @gfp_mask: memory allocation flags @@ -1034,7 +1038,7 @@ 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->timeout_list); INIT_LIST_HEAD(&q->icq_list); #ifdef CONFIG_BLK_CGROUP |