linux-kernel - Re: [PATCH v14 15/56] media: visl: Use vb2_get_buffer() instead of directly access to buffers array

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Message-ID: <b812aae8-a600-433e-81ba-d330f40dce21@collabora.com>
Date:   Thu, 9 Nov 2023 10:38:22 +0100
From:   Andrzej Pietrasiewicz <andrzej.p@...labora.com>
To:     Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        mchehab@...nel.org, tfiga@...omium.org, m.szyprowski@...sung.com,
        ming.qian@....com, ezequiel@...guardiasur.com.ar,
        p.zabel@...gutronix.de, gregkh@...uxfoundation.org,
        hverkuil-cisco@...all.nl, 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, Daniel Almeida <daniel.almeida@...labora.com>
Subject: Re: [PATCH v14 15/56] media: visl: Use vb2_get_buffer() instead of
 directly access to buffers array

W dniu 31.10.2023 o 17:30, Benjamin Gaignard pisze:
> Use vb2_get_buffer() instead of direct access to the vb2_queue bufs array.
> This allows us to change the type of the bufs in the future.
> 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>

Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@...labora.com>

> CC: Daniel Almeida <daniel.almeida@...labora.com>
> CC: Mauro Carvalho Chehab <mchehab@...nel.org>
> ---
>   drivers/media/test-drivers/visl/visl-dec.c | 28 ++++++++++++++++------
>   1 file changed, 21 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/media/test-drivers/visl/visl-dec.c b/drivers/media/test-drivers/visl/visl-dec.c
> index 318d675e5668..ba20ea998d19 100644
> --- a/drivers/media/test-drivers/visl/visl-dec.c
> +++ b/drivers/media/test-drivers/visl/visl-dec.c
> @@ -290,13 +290,20 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
>   	for (i = 0; i < out_q->num_buffers; i++) {
>   		char entry[] = "index: %u, state: %s, request_fd: %d, ";
>   		u32 old_len = len;
> -		char *q_status = visl_get_vb2_state(out_q->bufs[i]->state);
> +		struct vb2_buffer *vb2;
> +		char *q_status;
> +
> +		vb2 = vb2_get_buffer(out_q, i);
> +		if (!vb2)
> +			continue;
> +
> +		q_status = visl_get_vb2_state(vb2->state);
>   
>   		len += scnprintf(&buf[len], TPG_STR_BUF_SZ - len,
>   				 entry, i, q_status,
> -				 to_vb2_v4l2_buffer(out_q->bufs[i])->request_fd);
> +				 to_vb2_v4l2_buffer(vb2)->request_fd);
>   
> -		len += visl_fill_bytesused(to_vb2_v4l2_buffer(out_q->bufs[i]),
> +		len += visl_fill_bytesused(to_vb2_v4l2_buffer(vb2),
>   					   &buf[len],
>   					   TPG_STR_BUF_SZ - len);
>   
> @@ -342,13 +349,20 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
>   	len = 0;
>   	for (i = 0; i < cap_q->num_buffers; i++) {
>   		u32 old_len = len;
> -		char *q_status = visl_get_vb2_state(cap_q->bufs[i]->state);
> +		struct vb2_buffer *vb2;
> +		char *q_status;
> +
> +		vb2 = vb2_get_buffer(cap_q, i);
> +		if (!vb2)
> +			continue;
> +
> +		q_status = visl_get_vb2_state(vb2->state);
>   
>   		len += scnprintf(&buf[len], TPG_STR_BUF_SZ - len,
>   				 "index: %u, status: %s, timestamp: %llu, is_held: %d",
> -				 cap_q->bufs[i]->index, q_status,
> -				 cap_q->bufs[i]->timestamp,
> -				 to_vb2_v4l2_buffer(cap_q->bufs[i])->is_held);
> +				 vb2->index, q_status,
> +				 vb2->timestamp,
> +				 to_vb2_v4l2_buffer(vb2)->is_held);
>   
>   		tpg_gen_text(&ctx->tpg, basep, line++ * line_height, 16, &buf[old_len]);
>   		frame_dprintk(ctx->dev, run->dst->sequence, "%s", &buf[old_len]);