linux-kernel - Re: [PATCH] media: v4l2-core: fix entity initialization in device_register

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Message-ID: <0121a282-1509-42b9-e9c3-8c0bc6a1d25d@microchip.com>
Date:   Wed, 26 Feb 2020 15:02:46 +0000
From:   <Eugen.Hristev@...rochip.com>
To:     <sakari.ailus@....fi>
CC:     <linux-media@...r.kernel.org>, <hverkuil@...all.nl>,
        <laurent.pinchart@...asonboard.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: v4l2-core: fix entity initialization in
 device_register_subdev

On 26.02.2020 16:59, Sakari Ailus wrote:

> Hi Eugen,
> 
> On Wed, Feb 26, 2020 at 02:15:45PM +0200, Eugen Hristev wrote:
>> The check for parameters is done below in the function.
>> Initialize the entity variable properly, after the parameters
>> have been checked.
>>
>> Fixes: 61f5db549dde ("[media] v4l: Make v4l2_subdev inherit from media_entity")
>> Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
>> ---
>>   drivers/media/v4l2-core/v4l2-device.c | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/media/v4l2-core/v4l2-device.c b/drivers/media/v4l2-core/v4l2-device.c
>> index 63d6b147b21e..6e33132ebb19 100644
>> --- a/drivers/media/v4l2-core/v4l2-device.c
>> +++ b/drivers/media/v4l2-core/v4l2-device.c
>> @@ -112,7 +112,7 @@ int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
>>                                struct v4l2_subdev *sd)
>>   {
>>   #if defined(CONFIG_MEDIA_CONTROLLER)
>> -     struct media_entity *entity = &sd->entity;
>> +     struct media_entity *entity;
>>   #endif
>>        int err;
>>
>> @@ -141,6 +141,7 @@ int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
>>                goto error_module;
>>
>>   #if defined(CONFIG_MEDIA_CONTROLLER)
>> +     entity = &sd->entity;
>>        /* Register the entity. */
>>        if (v4l2_dev->mdev) {
>>                err = media_device_register_entity(v4l2_dev->mdev, entity);
> 
> Thanks for the patch.
> 
> Instead of keeping a shorthand for entity locally, I'd just refer to
> &sd->entity. It's more simple, and gets away with one pair of #if / #endif
> as well.

Hi,

I thought about that as well, but considered to modify as little as 
possible the original code.

Will send a v2.

Eugen

> 
> --
> Regards,
> 
> Sakari Ailus
>