diff options
| author | Jiufei Xue <jiufei.xue@linux.alibaba.com> | 2019-11-13 15:21:31 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-11-14 13:56:54 -0700 |
| commit | 8b37bc277fb459fa100808880a9d4e0641fff444 (patch) | |
| tree | a337c969b8cb7c4229696f00000e32235316dde7 /block/blk-iocost.c | |
| parent | 478de3380c1c7dbb0f65f545ee0185848413f3fe (diff) | |
| download | linux-8b37bc277fb459fa100808880a9d4e0641fff444.tar.gz linux-8b37bc277fb459fa100808880a9d4e0641fff444.tar.bz2 linux-8b37bc277fb459fa100808880a9d4e0641fff444.zip | |
iocost: check active_list of all the ancestors in iocg_activate()
There is a bug that checking the same active_list over and over again
in iocg_activate(). The intention of the code was checking whether all
the ancestors and self have already been activated. So fix it.
Fixes: 7caa47151ab2 ("blkcg: implement blk-iocost")
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jiufei Xue <jiufei.xue@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-iocost.c')
| -rw-r--r-- | block/blk-iocost.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/block/blk-iocost.c b/block/blk-iocost.c index a7ed434eae03..e01267f99183 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -1057,9 +1057,12 @@ static bool iocg_activate(struct ioc_gq *iocg, struct ioc_now *now) atomic64_set(&iocg->active_period, cur_period); /* already activated or breaking leaf-only constraint? */ - for (i = iocg->level; i > 0; i--) - if (!list_empty(&iocg->active_list)) + if (!list_empty(&iocg->active_list)) + goto succeed_unlock; + for (i = iocg->level - 1; i > 0; i--) + if (!list_empty(&iocg->ancestors[i]->active_list)) goto fail_unlock; + if (iocg->child_active_sum) goto fail_unlock; @@ -1101,6 +1104,7 @@ static bool iocg_activate(struct ioc_gq *iocg, struct ioc_now *now) ioc_start_period(ioc, now); } +succeed_unlock: spin_unlock_irq(&ioc->lock); return true; |