linux-kernel - Re: [PATCH v10 11/54] media: videobuf2: Access vb2_queue bufs array through helper functions

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Date:   Wed, 11 Oct 2023 11:32:12 +0200
From:   Benjamin Gaignard <benjamin.gaignard@...labora.com>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>, mchehab@...nel.org,
        tfiga@...omium.org, m.szyprowski@...sung.com, ming.qian@....com,
        ezequiel@...guardiasur.com.ar, p.zabel@...gutronix.de,
        gregkh@...uxfoundation.org, nicolas.dufresne@...labora.com
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        kernel@...labora.com
Subject: Re: [PATCH v10 11/54] media: videobuf2: Access vb2_queue bufs array
 through helper functions


Le 11/10/2023 à 10:44, Hans Verkuil a écrit :
> On 03/10/2023 10:06, Benjamin Gaignard wrote:
>> This patch adds 2 helpers functions to add and remove vb2 buffers
>> from a queue. With these 2 and vb2_get_buffer(), bufs field of
>> struct vb2_queue becomes like a private member of the structure.
>>
>> After each call to vb2_get_buffer() we need to be sure that we get
>> a valid pointer so check the return value of all of them.
> This needs to be extended: checking the returned pointer is a preparation
> for when buffers can be deleted. As it is right now, checking for a
> NULL pointer isn't needed.
>
> I wonder if it isn't better to drop those checks and instead apply them
> at the tail end of this series when the actual work on deleting buffers
> starts (before patch 49, I think).

I think that checking vb2_get_buffer() return value while removing direct
call to queue buffers array doesn't hurt here.
It is also needed to do that before "media: videobuf2: Add helper to get queue number of buffers" patch.

Regards,
Benjamin

>
> Regards,
>
> 	Hans
>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
>> ---
>>   .../media/common/videobuf2/videobuf2-core.c   | 151 +++++++++++++-----
>>   .../media/common/videobuf2/videobuf2-v4l2.c   |  51 ++++--
>>   2 files changed, 146 insertions(+), 56 deletions(-)
>