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authorTejun Heo <tj@kernel.org>2021-10-15 01:20:22 +0200
committerJens Axboe <axboe@kernel.dk>2021-10-18 14:17:01 +0200
commit3c08b0931eedd04c530040499fadeccab50ed646 (patch)
tree8d204be36c3df0a58fdc58cb1c785f1f5812def5 /fs/quota
parentLinux 5.15-rc6 (diff)
downloadlinux-3c08b0931eedd04c530040499fadeccab50ed646.tar.xz
linux-3c08b0931eedd04c530040499fadeccab50ed646.zip
blk-cgroup: blk_cgroup_bio_start() should use irq-safe operations on blkg->iostat_cpu
c3df5fb57fe8 ("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: 2d146aa3aa84 ("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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