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| author | Yu Kuai <yukuai3@huawei.com> | 2022-10-12 17:40:35 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-10-23 18:59:17 -0600 |
| commit | 074501bce3c5b4200a94b9937d189b3e3e2dbc98 (patch) | |
| tree | 0166f39315e18b1597cf7c881235c504b7c32305 /block/blk-iocost.c | |
| parent | 2b2da2f6dc80e1299586f7e046a071809d5dee7f (diff) | |
| download | lwn-074501bce3c5b4200a94b9937d189b3e3e2dbc98.tar.gz lwn-074501bce3c5b4200a94b9937d189b3e3e2dbc98.zip | |
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>
Diffstat (limited to 'block/blk-iocost.c')
| -rw-r--r-- | block/blk-iocost.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/block/blk-iocost.c b/block/blk-iocost.c index 5acc5f13bbd6..f01359906c83 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -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; |