linux-kernel - Re: [PATCH] media: media videobuf2: Stop direct calls to queue num

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Date: Tue, 16 Jan 2024 10:21:53 +0100
From: Hans Verkuil <hverkuil-cisco@...all.nl>
To: Benjamin Gaignard <benjamin.gaignard@...labora.com>, tfiga@...omium.org,
 m.szyprowski@...sung.com, mchehab@...nel.org
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
 kernel@...labora.com
Subject: Re: [PATCH] media: media videobuf2: Stop direct calls to queue
 num_buffers field

On 15/01/2024 18:08, Benjamin Gaignard wrote:
> Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
> This allows us to change how the number of buffers is computed in the
> future.
> 
> Fixes: c838530d230b ("media: media videobuf2: Be more flexible on the number of queue stored buffers")
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
> ---
>  drivers/media/common/videobuf2/videobuf2-core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
> index 41a832dd1426..b6bf8f232f48 100644
> --- a/drivers/media/common/videobuf2/videobuf2-core.c
> +++ b/drivers/media/common/videobuf2/videobuf2-core.c
> @@ -989,7 +989,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
>  	bool no_previous_buffers = !q_num_bufs;
>  	int ret = 0;
>  
> -	if (q->num_buffers == q->max_num_buffers) {
> +	if (q_num_bufs == q->max_num_buffers) {
>  		dprintk(q, 1, "maximum number of buffers already allocated\n");
>  		return -ENOBUFS;
>  	}

There is another case in vb2_ioctl_create_bufs() where num_buffers is accessed directly.
Can you fix that one as well?

Regards,

	Hans