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Message-ID: <YEjAL22jNXvpe23W@pendragon.ideasonboard.com>
Date: Wed, 10 Mar 2021 14:48:47 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc: Dave Stevenson <dave.stevenson@...pberrypi.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Pavel Machek <pavel@...x.de>,
Andrey Konovalov <andrey.konovalov@...aro.org>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Jacopo Mondi <jacopo@...ndi.org>,
Hans Verkuil <hverkuil-cisco@...all.nl>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-renesas-soc@...r.kernel.org,
Prabhakar <prabhakar.csengg@...il.com>,
Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH 3/3] media: i2c: imx219: Balance runtime PM use-count in
resume callback
Hi Prabhakar,
Thank you for the patch.
On Wed, Mar 10, 2021 at 12:20:14PM +0000, Lad Prabhakar wrote:
> The runtime PM use-count gets incremented in imx219_set_stream() call
> when streaming is started this needs to be balanced by calling
> pm_runtime_put() upon failure to start stream in resume callback.
>
> Fixes: 1283b3b8f82b9 ("media: i2c: Add driver for Sony IMX219 sensor")
> Reported-by: Pavel Machek <pavel@...x.de>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
> drivers/media/i2c/imx219.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
> index 87c021de1460..afffc85cd265 100644
> --- a/drivers/media/i2c/imx219.c
> +++ b/drivers/media/i2c/imx219.c
> @@ -1184,6 +1184,7 @@ static int __maybe_unused imx219_resume(struct device *dev)
> {
> struct v4l2_subdev *sd = dev_get_drvdata(dev);
> struct imx219 *imx219 = to_imx219(sd);
> + struct i2c_client *client;
> int ret;
>
> mutex_lock(&imx219->mutex);
> @@ -1197,7 +1198,9 @@ static int __maybe_unused imx219_resume(struct device *dev)
> return 0;
>
> error:
> + client = v4l2_get_subdevdata(&imx219->sd);
> imx219_stop_streaming(imx219);
> + pm_runtime_put(&client->dev);
> imx219->streaming = false;
> __v4l2_ctrl_grab(imx219->vflip, false);
> __v4l2_ctrl_grab(imx219->hflip, false);
Similarly to the __v4l2_ctrl_grab(), it could be better to move
pm_runtime_put() to imx219_stop_streaming().
--
Regards,
Laurent Pinchart
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