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

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Date:	Tue, 16 Nov 2010 12:24:43 -0800
From:	achew@...dia.com
To:	zhangtianfei@...dcoretech.com, hverkuil@...all.nl, pawel@...iak.com
Cc:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Chew <achew@...dia.com>
Subject: [PATCH 1/1] videobuf: Initialize lists in videobuf_buffer.

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.

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),
-- 
1.7.0.4

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