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

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>
This commit is contained in:
Tejun Heo 2021-10-14 13:20:22 -10:00 committed by Jens Axboe
parent d29bd41428
commit 5370b0f490
1 changed files with 3 additions and 2 deletions
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5
block/blk-cgroup.c
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@ -1897,10 +1897,11 @@ void blk_cgroup_bio_start(struct bio *bio)
{
int rwd = blk_cgroup_io_type(bio), cpu;
struct blkg_iostat_set *bis;
unsigned long flags;
cpu = get_cpu();
bis = per_cpu_ptr(bio->bi_blkg->iostat_cpu, cpu);
u64_stats_update_begin(&bis->sync);
flags = u64_stats_update_begin_irqsave(&bis->sync);
/*
* If the bio is flagged with BIO_CGROUP_ACCT it means this is a split
@ -1912,7 +1913,7 @@ void blk_cgroup_bio_start(struct bio *bio)
}
bis->cur.ios[rwd]++;
u64_stats_update_end(&bis->sync);
u64_stats_update_end_irqrestore(&bis->sync, flags);
if (cgroup_subsys_on_dfl(io_cgrp_subsys))
cgroup_rstat_updated(bio->bi_blkg->blkcg->css.cgroup, cpu);
put_cpu();