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

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Message-ID: <4CE3325E.6030008@leadcoretech.com>
Date:	Wed, 17 Nov 2010 09:39:42 +0800
From:	"Figo.zhang" <zhangtianfei@...dcoretech.com>
To:	Andrew Chew <AChew@...dia.com>
CC:	"hverkuil@...all.nl" <hverkuil@...all.nl>,
	"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.

于 11/17/2010 09:38 AM, Andrew Chew 写道:
>>> 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?

yes, i think those WARN_ONs are no need.
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