linux-kernel - [PATCH 4.19 330/421] ALSA: ac97: fix PM reference leak in ac97_bus

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Message-Id: <20210719144957.732287675@linuxfoundation.org>
Date:   Mon, 19 Jul 2021 16:52:21 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hulk Robot <hulkci@...wei.com>,
        Yufen Yu <yuyufen@...wei.com>, Takashi Iwai <tiwai@...e.de>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 330/421] ALSA: ac97: fix PM reference leak in ac97_bus_remove()

From: Yufen Yu <yuyufen@...wei.com>

[ Upstream commit a38e93302ee25b2ca6f4ee76c6c974cf3637985e ]

pm_runtime_get_sync will increment pm usage counter even it failed.
Forgetting to putting operation will result in reference leak here.
Fix it by replacing it with pm_runtime_resume_and_get to keep usage
counter balanced.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Yufen Yu <yuyufen@...wei.com>
Link: https://lore.kernel.org/r/20210524093811.612302-1-yuyufen@huawei.com
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/ac97/bus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/ac97/bus.c b/sound/ac97/bus.c
index ca50ff444796..d8b227e6d4cf 100644
--- a/sound/ac97/bus.c
+++ b/sound/ac97/bus.c
@@ -523,7 +523,7 @@ static int ac97_bus_remove(struct device *dev)
 	struct ac97_codec_driver *adrv = to_ac97_driver(dev->driver);
 	int ret;
 
-	ret = pm_runtime_get_sync(dev);
+	ret = pm_runtime_resume_and_get(dev);
 	if (ret < 0)
 		return ret;
 
-- 
2.30.2