linux-kernel - Re: [PATCH v1 10/24] media: v4l2-mem2mem: Trace on implicit un-hold

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Date:   Tue, 29 Mar 2022 15:58:55 +0200
From:   Sebastian Fricke <sebastian.fricke@...labora.com>
To:     Nicolas Dufresne <nicolas.dufresne@...labora.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>, kernel@...labora.com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 10/24] media: v4l2-mem2mem: Trace on implicit un-hold

Hey Nicolas,

On 28.03.2022 15:59, Nicolas Dufresne wrote:
>If the timestamp of the src buffer differs from the timestamp of a held
>dst buffer, the held buffer is implicitly removed and marked as done.
>Add a trace to help debugging if someone hits that case.
>
>Signed-off-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
Reviewed-by: Sebastian Fricke <sebastian.fricke@...labora.com>

Greetings,
Sebastian

>---
> drivers/media/v4l2-core/v4l2-mem2mem.c | 1 +
> 1 file changed, 1 insertion(+)
>
>diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
>index 53c2332d5cbd..d3e739ef16ef 100644
>--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
>+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
>@@ -336,6 +336,7 @@ static void __v4l2_m2m_try_queue(struct v4l2_m2m_dev *m2m_dev,
> 	if (src && dst && dst->is_held &&
> 	    dst->vb2_buf.copied_timestamp &&
> 	    dst->vb2_buf.timestamp != src->vb2_buf.timestamp) {
>+		dprintk("src and dst timestamp mismatch, removing held capture buffer.\n");
> 		dst->is_held = false;
> 		v4l2_m2m_dst_buf_remove(m2m_ctx);
> 		v4l2_m2m_buf_done(dst, VB2_BUF_STATE_DONE);
>-- 
>2.34.1
>