linux-kernel - Re: [PATCH v7 07/49] media: sti: hva: Use vb2_get_buffer() instead of directly access to buffers array

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Message-ID: <ecfd1641-3cce-dfa4-b88c-3619fb12d710@collabora.com>
Date:   Tue, 19 Sep 2023 12:26:45 +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 v7 07/49] media: sti: hva: Use vb2_get_buffer() instead of
 directly access to buffers array


Le 19/09/2023 à 11:31, Hans Verkuil a écrit :
> On 14/09/2023 15:32, Benjamin Gaignard wrote:
>> Use vb2_get_buffer() instead of directly access to vb2_buffer buffer array.
>> This could allow to change the type bufs[] field of vb2_buffer structure if
>> needed.
>> 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.
>>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
>> ---
>>   drivers/media/platform/st/sti/hva/hva-v4l2.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/media/platform/st/sti/hva/hva-v4l2.c b/drivers/media/platform/st/sti/hva/hva-v4l2.c
>> index 3a848ca32a0e..326be09bdb55 100644
>> --- a/drivers/media/platform/st/sti/hva/hva-v4l2.c
>> +++ b/drivers/media/platform/st/sti/hva/hva-v4l2.c
>> @@ -577,6 +577,10 @@ static int hva_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
>>   		}
> Above this line there is a buf->index check...
>
>>   
>>   		vb2_buf = vb2_get_buffer(vq, buf->index);
>> +		if (!vb2_buf) {
>> +			dev_dbg(dev, "%s buffer index %d not found\n", ctx->name, buf->index);
>> +			return -EINVAL;
>> +		}
> ...I think that check can be dropped since vb2_get_buffer checks that already.

No because in "media: sti: hva: Stop direct calls to queue num_buffers field" patch
I remove the above check since it use queue num_buffers field.

Regards,
Benjamin

>
> Regards,
>
> 	Hans
>
>>   		stream = to_hva_stream(to_vb2_v4l2_buffer(vb2_buf));
>>   		stream->bytesused = buf->bytesused;
>>   	}
>