dm-delay: fix workqueue delay_timer race

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delay_timer could be pending when delay_dtr() is called. It needs to be
shut down before kdelayd_wq is destroyed, so it won't try queueing more
work to kdelayd_wq while that's getting destroyed.

Also the del_timer_sync() call in delay_presuspend() doesn't protect
against the timer getting immediately rearmed by the queued call to
flush_delayed_bios(), but there's no real harm if that does happen.
timer_delete() is less work, and is basically just as likely to stop a
pointless call to flush_delayed_bios().

Fixes: 26b9f22870 ("dm: delay target")
Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

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Benjamin Marzinski 2024-05-07 17:16:23 -04:00 • committed by Mike Snitzer

parent 83637d9017

commit 8d24790ed0

1 changed files with 4 additions and 2 deletions

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drivers/md/dm-delay.c

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