linux-kernel - [PATCH 3.16 056/212] blk-mq: Make bt_clear

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Message-ID: <lsq.1496331795.394937218@decadent.org.uk>
Date:   Thu, 01 Jun 2017 16:43:15 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Jens Axboe" <axboe@...com>,
        "Bart Van Assche" <bvanassche@....org>
Subject: [PATCH 3.16 056/212] blk-mq: Make bt_clear_tag() easier to read

3.16.44-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Bart Van Assche <bvanassche@....org>

commit 9d8f0bcca6ffa024a822ce4ab1008ab663f06672 upstream.

Eliminate a backwards goto statement from bt_clear_tag().

Signed-off-by: Bart Van Assche <bvanassche@....org>
Signed-off-by: Jens Axboe <axboe@...com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 block/blk-mq-tag.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -352,15 +352,12 @@ static void bt_clear_tag(struct blk_mq_b
 		return;
 
 	wait_cnt = atomic_dec_return(&bs->wait_cnt);
+	if (unlikely(wait_cnt < 0))
+		wait_cnt = atomic_inc_return(&bs->wait_cnt);
 	if (wait_cnt == 0) {
-wake:
 		atomic_add(bt->wake_cnt, &bs->wait_cnt);
 		bt_index_atomic_inc(&bt->wake_index);
 		wake_up(&bs->wait);
-	} else if (wait_cnt < 0) {
-		wait_cnt = atomic_inc_return(&bs->wait_cnt);
-		if (!wait_cnt)
-			goto wake;
 	}
 }