linux-kernel - Re: [PATCH] media: pxa_camera: disable and unprepare the clock source on error

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Date:   Mon, 11 Dec 2017 13:05:46 -0800
From:   Flavio Ceolin <flavio.ceolin@...el.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     linux-kernel@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Petr Cvek <petr.cvek@....cz>,
        Sakari Ailus <sakari.ailus@....fi>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Julia Lawall <Julia.Lawall@...6.fr>,
        Arnd Bergmann <arnd@...db.de>,
        "open list\:MEDIA INPUT INFRASTRUCTURE \(V4L\/DVB\)" 
        <linux-media@...r.kernel.org>
Subject: Re: [PATCH] media: pxa_camera: disable and unprepare the clock source on error

Hi Laurent,

> Hi Flavio,
>
> Thank you for the patch.
>
> On Wednesday, 6 December 2017 18:38:50 EET Flavio Ceolin wrote:
>> pxa_camera_probe() was not calling pxa_camera_deactivate(),
>> responsible to call clk_disable_unprepare(), on the failure path. This
>> was leading to unbalancing source clock.
>> 
>> Found by Linux Driver Verification project (linuxtesting.org).
>
> Any chance I could sign you up for more work on this driver ? :-)

Definetely, this would be great :)

>
>> Signed-off-by: Flavio Ceolin <flavio.ceolin@...el.com>
>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>
> I expect Hans Verkuil to pick up the patch.
>
>> ---
>>  drivers/media/platform/pxa_camera.c | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/media/platform/pxa_camera.c
>> b/drivers/media/platform/pxa_camera.c index 9d3f0cb..7877037 100644
>> --- a/drivers/media/platform/pxa_camera.c
>> +++ b/drivers/media/platform/pxa_camera.c
>> @@ -2489,7 +2489,7 @@ static int pxa_camera_probe(struct platform_device
>> *pdev) dev_set_drvdata(&pdev->dev, pcdev);
>>  	err = v4l2_device_register(&pdev->dev, &pcdev->v4l2_dev);
>>  	if (err)
>> -		goto exit_free_dma;
>> +		goto exit_deactivate;
>> 
>>  	pcdev->asds[0] = &pcdev->asd;
>>  	pcdev->notifier.subdevs = pcdev->asds;
>> @@ -2525,6 +2525,8 @@ static int pxa_camera_probe(struct platform_device
>> *pdev) v4l2_clk_unregister(pcdev->mclk_clk);
>>  exit_free_v4l2dev:
>>  	v4l2_device_unregister(&pcdev->v4l2_dev);
>> +exit_deactivate:
>> +	pxa_camera_deactivate(pcdev);
>>  exit_free_dma:
>>  	dma_release_channel(pcdev->dma_chans[2]);
>>  exit_free_dma_u:
>
> -- 
> Regards,
>
> Laurent Pinchart

Regards,
Flavio Ceolin