linux-kernel - Re: [PATCH] v4l2: Change call of function in videobuf2-core.c

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Date:	Mon, 04 Aug 2014 07:03:14 +0200
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Nicholas Krause <xerofoify@...il.com>, udovdh@...all.nl
CC:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] v4l2: Change call of function in videobuf2-core.c

On 08/04/2014 05:25 AM, Nicholas Krause wrote:
> This patch changes the call of vb2_buffer_core to use VB2_BUFFER_STATE_ACTIVE
> inside the for instead of not setting in correctly to VB2_BUFFER_STATE_ERROR.
> 
> Signed-off-by: Nicholas Krause <xerofoify@...il.com>

Dunno what's going on here after reading Dave Airlie's reply, but:

Nacked-by: Hans Verkuil <hans.verkuil@...co.com>

It's clearly wrong and if you get here at all you have a driver bug anyway. That
WARN_ON is there for a reason. Your driver isn't returning buffers correctly in
stop_streaming or in start_streaming if start_streaming fails with an error.

Regards,

	Hans

> ---
>  drivers/media/v4l2-core/videobuf2-core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
> index 7c4489c..08e478b 100644
> --- a/drivers/media/v4l2-core/videobuf2-core.c
> +++ b/drivers/media/v4l2-core/videobuf2-core.c
> @@ -2115,7 +2115,7 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
>  	if (WARN_ON(atomic_read(&q->owned_by_drv_count))) {
>  		for (i = 0; i < q->num_buffers; ++i)
>  			if (q->bufs[i]->state == VB2_BUF_STATE_ACTIVE)
> -				vb2_buffer_done(q->bufs[i], VB2_BUF_STATE_ERROR);
> +				vb2_buffer_done(q->bufs[i], VB2_BUF_STATE_ACTIVE);
>  		/* Must be zero now */
>  		WARN_ON(atomic_read(&q->owned_by_drv_count));
>  	}
> 

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