linux-kernel - Re: [PATCH v2] [media] vb2: include lengths in dmabuf qbuf debug message

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Date:	Wed, 20 Jul 2016 22:52:29 +0300
From:	Sakari Ailus <sakari.ailus@....fi>
To:	Javier Martinez Canillas <javier@....samsung.com>
Cc:	linux-kernel@...r.kernel.org,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Mauro Carvalho Chehab <mchehab@...pensource.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Pawel Osciak <pawel@...iak.com>, linux-media@...r.kernel.org
Subject: Re: [PATCH v2] [media] vb2: include lengths in dmabuf qbuf debug
 message

On Wed, Jul 20, 2016 at 12:07:55PM -0400, Javier Martinez Canillas wrote:
> If the VIDIOC_QBUF ioctl fails due a wrong dmabuf length, it's
> useful to get the invalid and minimum lengths as a debug info.
> 
> Before this patch:
> 
> vb2-core: __qbuf_dmabuf: invalid dmabuf length for plane 1
> 
> After this patch:
> 
> vb2-core: __qbuf_dmabuf: invalid dmabuf length 221248 for plane 1, minimum length 410880
> 
> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
> 
> ---
> 
> Changes in v2:
> - Use %u instead of %d (Sakari Ailus)
> - Include min_length (Sakari Ailus)
> 
>  drivers/media/v4l2-core/videobuf2-core.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
> index b6fbc04f9699..bbba50d6e1ad 100644
> --- a/drivers/media/v4l2-core/videobuf2-core.c
> +++ b/drivers/media/v4l2-core/videobuf2-core.c
> @@ -1227,8 +1227,10 @@ static int __qbuf_dmabuf(struct vb2_buffer *vb, const void *pb)
>  			planes[plane].length = dbuf->size;
>  
>  		if (planes[plane].length < vb->planes[plane].min_length) {
> -			dprintk(1, "invalid dmabuf length for plane %d\n",
> -				plane);
> +			dprintk(1, "invalid dmabuf length %u for plane %d, "
> +				"minimum length %u\n",

You shouldn't split strings. It breaks grep.

With that changed,

Acked-by: Sakari Ailus <sakari.ailus@...ux.intel.com>

> +				planes[plane].length, plane,
> +				vb->planes[plane].min_length);
>  			dma_buf_put(dbuf);
>  			ret = -EINVAL;
>  			goto err;

-- 
Sakari Ailus
e-mail: sakari.ailus@....fi	XMPP: sailus@...iisi.org.uk