linux-kernel - [PATCH] media: coda: Fix runtime PM imbalance on error

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Message-Id: <20200521101735.15675-1-dinghao.liu@zju.edu.cn>
Date:   Thu, 21 May 2020 18:17:35 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media: coda: Fix runtime PM imbalance on error

pm_runtime_get_sync() increments the runtime PM usage counter even
when it returns an error code. Thus a pairing decrement is needed on
the error handling path to keep the counter balanced.

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---
 drivers/media/platform/coda/coda-common.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/coda/coda-common.c b/drivers/media/platform/coda/coda-common.c
index d0d093dd8f7c..a527e4dc922c 100644
--- a/drivers/media/platform/coda/coda-common.c
+++ b/drivers/media/platform/coda/coda-common.c
@@ -2502,7 +2502,7 @@ static int coda_open(struct file *file)
 
 	ret = clk_prepare_enable(dev->clk_per);
 	if (ret)
-		goto err_clk_per;
+		goto err_pm_get;
 
 	ret = clk_prepare_enable(dev->clk_ahb);
 	if (ret)
@@ -2541,9 +2541,8 @@ static int coda_open(struct file *file)
 	clk_disable_unprepare(dev->clk_ahb);
 err_clk_ahb:
 	clk_disable_unprepare(dev->clk_per);
-err_clk_per:
-	pm_runtime_put_sync(dev->dev);
 err_pm_get:
+	pm_runtime_put_sync(dev->dev);
 	v4l2_fh_del(&ctx->fh);
 	v4l2_fh_exit(&ctx->fh);
 err_coda_name_init:
-- 
2.17.1