linux-kernel - Re: [PATCH 1/1] videobuf: Initialize lists in videobuf

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Date:	Wed, 17 Nov 2010 08:13:43 +0100
From:	Hans Verkuil <hverkuil@...all.nl>
To:	achew@...dia.com
Cc:	zhangtianfei@...dcoretech.com, pawel@...iak.com,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] videobuf: Initialize lists in videobuf_buffer.

On Tuesday, November 16, 2010 21:24:43 achew@...dia.com wrote:
> From: Andrew Chew <achew@...dia.com>
> 
> There are two struct list_head's in struct videobuf_buffer.
> Prior to this fix, all we did for initialization of struct videobuf_buffer
> was to zero out its memory.  This does not properly initialize this struct's
> two list_head members.
> 
> This patch immediately calls INIT_LIST_HEAD on both lists after the kzalloc,
> so that the two lists are initialized properly.

Rather than doing this for all videobuf variants I would suggest that you
do this in videobuf-core.c, videobuf_alloc_vb().

Regards,

	Hans

> 
> Signed-off-by: Andrew Chew <achew@...dia.com>
> ---
> I thought I'd submit a patch for this anyway.  Without this, the existing
> camera host drivers will spew an ugly warning on every videobuf allocation,
> which gets annoying really fast.
> 
>  drivers/media/video/videobuf-dma-contig.c |    2 ++
>  drivers/media/video/videobuf-dma-sg.c     |    2 ++
>  drivers/media/video/videobuf-vmalloc.c    |    2 ++
>  3 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/media/video/videobuf-dma-contig.c b/drivers/media/video/videobuf-dma-contig.c
> index c969111..f7e0f86 100644
> --- a/drivers/media/video/videobuf-dma-contig.c
> +++ b/drivers/media/video/videobuf-dma-contig.c
> @@ -193,6 +193,8 @@ static struct videobuf_buffer *__videobuf_alloc_vb(size_t size)
>  	if (vb) {
>  		mem = vb->priv = ((char *)vb) + size;
>  		mem->magic = MAGIC_DC_MEM;
> +		INIT_LIST_HEAD(&vb->stream);
> +		INIT_LIST_HEAD(&vb->queue);
>  	}
>  
>  	return vb;
> diff --git a/drivers/media/video/videobuf-dma-sg.c b/drivers/media/video/videobuf-dma-sg.c
> index 20f227e..5af3217 100644
> --- a/drivers/media/video/videobuf-dma-sg.c
> +++ b/drivers/media/video/videobuf-dma-sg.c
> @@ -430,6 +430,8 @@ static struct videobuf_buffer *__videobuf_alloc_vb(size_t size)
>  
>  	mem = vb->priv = ((char *)vb) + size;
>  	mem->magic = MAGIC_SG_MEM;
> +	INIT_LIST_HEAD(&vb->stream);
> +	INIT_LIST_HEAD(&vb->queue);
>  
>  	videobuf_dma_init(&mem->dma);
>  
> diff --git a/drivers/media/video/videobuf-vmalloc.c b/drivers/media/video/videobuf-vmalloc.c
> index df14258..8babedd 100644
> --- a/drivers/media/video/videobuf-vmalloc.c
> +++ b/drivers/media/video/videobuf-vmalloc.c
> @@ -146,6 +146,8 @@ static struct videobuf_buffer *__videobuf_alloc_vb(size_t size)
>  
>  	mem = vb->priv = ((char *)vb) + size;
>  	mem->magic = MAGIC_VMAL_MEM;
> +	INIT_LIST_HEAD(&vb->stream);
> +	INIT_LIST_HEAD(&vb->queue);
>  
>  	dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
>  		__func__, vb, (long)sizeof(*vb), (long)size - sizeof(*vb),
> 

-- 
Hans Verkuil - video4linux developer - sponsored by Cisco
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