linux-kernel - [PATCH] media: imx: imx7-mipi-csis: Fix runtime PM imbalance in mipi_csis_s

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Message-Id: <20210408090827.32612-1-dinghao.liu@zju.edu.cn>
Date:   Thu,  8 Apr 2021 17:08:27 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Rui Miguel Silva <rmfrfs@...il.com>,
        Steve Longerbeam <slongerbeam@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media: imx: imx7-mipi-csis: Fix runtime PM imbalance in mipi_csis_s_stream

When v4l2_subdev_call() fails, a pairing PM usage counter
decrement is needed to keep the counter balanced. It's the
same for the following error paths in case 'enable' is on.

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---
 drivers/staging/media/imx/imx7-mipi-csis.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
index a01a7364b4b9..2a3fff231a40 100644
--- a/drivers/staging/media/imx/imx7-mipi-csis.c
+++ b/drivers/staging/media/imx/imx7-mipi-csis.c
@@ -627,21 +627,26 @@ static int mipi_csis_s_stream(struct v4l2_subdev *mipi_sd, int enable)
 			return ret;
 		}
 		ret = v4l2_subdev_call(state->src_sd, core, s_power, 1);
-		if (ret < 0)
+		if (ret < 0) {
+			pm_runtime_put_noidle(&state->pdev->dev);
 			return ret;
+		}
 	}
 
 	mutex_lock(&state->lock);
 	if (enable) {
 		if (state->flags & ST_SUSPENDED) {
 			ret = -EBUSY;
+			pm_runtime_put_noidle(&state->pdev->dev);
 			goto unlock;
 		}
 
 		mipi_csis_start_stream(state);
 		ret = v4l2_subdev_call(state->src_sd, video, s_stream, 1);
-		if (ret < 0)
+		if (ret < 0) {
+			pm_runtime_put_noidle(&state->pdev->dev);
 			goto unlock;
+		}
 
 		mipi_csis_log_counters(state, true);
 
-- 
2.17.1