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

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Date:	Wed, 17 Nov 2010 08:11:06 +0100
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Andrew Chew <AChew@...dia.com>
Cc:	"'Figo.zhang'" <zhangtianfei@...dcoretech.com>,
	"pawel@...iak.com" <pawel@...iak.com>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] videobuf: Initialize lists in videobuf_buffer.

On Wednesday, November 17, 2010 02:38:09 Andrew Chew wrote:
> > > 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);
> > 
> > i think it no need to be init, it just a list-entry.
> 
> Okay, if that's really the case, then sh_mobile_ceu_camera.c, pxa_camera.c, mx1_camera.c, mx2_camera.c, and omap1_camera.c needs to be fixed to remove that WARN_ON(!list_empty(&vb->queue)); in their videobuf_prepare() methods, because those WARN_ON's are assuming that vb->queue is properly initialized as a list head.
> 
> Which will it be?
> 

These list entries need to be inited. It is bad form to have uninitialized
list entries. It is not as if this is a big deal to initialize them properly.

Regards,

	Hans

-- 
Hans Verkuil - video4linux developer - sponsored by Cisco
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