blk-cgroup: blk_cgroup_bio_start() should use irq-safe operations on blkg->iostat_cpu

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c3df5fb57f ("cgroup: rstat: fix A-A deadlock on 32bit around
u64_stats_sync") made u64_stats updates irq-safe to avoid A-A deadlocks.
Unfortunately, the conversion missed one in blk_cgroup_bio_start(). Fix it.

Fixes: 2d146aa3aa ("mm: memcontrol: switch to rstat")
Cc: stable@vger.kernel.org # v5.13+
Reported-by: syzbot+9738c8815b375ce482a1@syzkaller.appspotmail.com
Signed-off-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/YWi7NrQdVlxD6J9W@slm.duckdns.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Tejun Heo 2021-10-14 13:20:22 -10:00 • committed by Jens Axboe

parent 519d81956e

commit 3c08b0931e

1 changed files with 3 additions and 2 deletions

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block/blk-cgroup.c

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