linux-kernel - [PATCH] iocost: Fix check condition of iocg abs

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Message-Id: <20200730090321.38781-1-zhouchengming@bytedance.com>
Date:   Thu, 30 Jul 2020 17:03:21 +0800
From:   Chengming Zhou <zhouchengming@...edance.com>
To:     tj@...nel.org, axboe@...nel.dk, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     zhouchengming@...edance.com
Subject: [PATCH] iocost: Fix check condition of iocg abs_vdebt

We shouldn't skip iocg when its abs_vdebt is not zero.

Fixes: 0b80f9866e6b ("iocost: protect iocg->abs_vdebt with
iocg->waitq.lock")

Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
---
 block/blk-iocost.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 8ac4aad66ebc..86ba6fd254e1 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -1370,7 +1370,7 @@ static void ioc_timer_fn(struct timer_list *timer)
 	 * should have woken up in the last period and expire idle iocgs.
 	 */
 	list_for_each_entry_safe(iocg, tiocg, &ioc->active_iocgs, active_list) {
-		if (!waitqueue_active(&iocg->waitq) && iocg->abs_vdebt &&
+		if (!waitqueue_active(&iocg->waitq) && !iocg->abs_vdebt &&
 		    !iocg_is_idle(iocg))
 			continue;
 
-- 
2.20.1