linux-kernel - [PATCH v2 10/10] blk-throttle: avoid dead code in throtl_hierarchy_can

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Date:   Tue, 29 Nov 2022 11:01:47 +0800
From:   Kemeng Shi <shikemeng@...wei.com>
To:     <tj@...nel.org>, <josef@...icpanda.com>, <axboe@...nel.dk>
CC:     <cgroups@...r.kernel.org>, <linux-block@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <shikemeng@...wei.com>
Subject: [PATCH v2 10/10] blk-throttle: avoid dead code in throtl_hierarchy_can_upgrade

Function throtl_hierarchy_can_upgrade will always return from while loop,
so the return outside while loop is never reached. Break the loop when
we traverse to root as throtl_hierarchy_can_downgrade do to avoid dead
code.

Signed-off-by: Kemeng Shi <shikemeng@...wei.com>
---
 block/blk-throttle.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 4c80f2aa1e29..9946524de158 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1854,7 +1854,7 @@ static bool throtl_hierarchy_can_upgrade(struct throtl_grp *tg)
 			return true;
 		tg = sq_to_tg(tg->service_queue.parent_sq);
 		if (!tg || !tg_to_blkg(tg)->parent)
-			return false;
+			break;
 	}
 	return false;
 }
-- 
2.30.0