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blk-iocost: read 'ioc->params' inside 'ioc->lock' in ioc_timer_fn() 

'ioc->params' is updated in ioc_refresh_params(), which is proteced by
'ioc->lock', however, ioc_timer_fn() read params outside the lock.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20221012094035.390056-5-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Yu Kuai 2022-10-12 17:40:35 +08:00 committed by Jens Axboe
parent 2b2da2f6dc
commit 074501bce3
1 changed files with 4 additions and 2 deletions
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6
block/blk-iocost.c
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@ -2203,8 +2203,8 @@ static void ioc_timer_fn(struct timer_list *timer)
LIST_HEAD(surpluses);
int nr_debtors, nr_shortages = 0, nr_lagging = 0;
u64 usage_us_sum = 0;
u32 ppm_rthr = MILLION - ioc->params.qos[QOS_RPPM];
u32 ppm_wthr = MILLION - ioc->params.qos[QOS_WPPM];
u32 ppm_rthr;
u32 ppm_wthr;
u32 missed_ppm[2], rq_wait_pct;
u64 period_vtime;
int prev_busy_level;
@ -2215,6 +2215,8 @@ static void ioc_timer_fn(struct timer_list *timer)
/* take care of active iocgs */
spin_lock_irq(&ioc->lock);
ppm_rthr = MILLION - ioc->params.qos[QOS_RPPM];
ppm_wthr = MILLION - ioc->params.qos[QOS_WPPM];
ioc_now(ioc, &now);
period_vtime = now.vnow - ioc->period_at_vtime;