Patch "[media] media: vb2 dma-contig: Fully cache synchronise buffers in prepare and finish" has been added to the 3.10-stable tree

Patch "[media] media: vb2 dma-contig: Fully cache synchronise buffers in prepare and finish" has been added to the 3.10-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    [media] media: vb2 dma-contig: Fully cache synchronise buffers in prepare and finish

to the 3.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     media-vb2-dma-contig-fully-cache-synchronise-buffers-in-prepare-and-finish.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From d9a985883fa32453d099d6293188c11d75cef1fa Mon Sep 17 00:00:00 2001
From: Tiffany Lin <tiffany.lin@mediatek.com>
Date: Thu, 24 Sep 2015 06:02:36 -0300
Subject: [media] media: vb2 dma-contig: Fully cache synchronise buffers in prepare and finish

From: Tiffany Lin <tiffany.lin@mediatek.com>

commit d9a985883fa32453d099d6293188c11d75cef1fa upstream.

In videobuf2 dma-contig memory type the prepare and finish ops, instead of
passing the number of entries in the original scatterlist as the "nents"
parameter to dma_sync_sg_for_device() and dma_sync_sg_for_cpu(), the value
returned by dma_map_sg() was used. Albeit this has been suggested in
comments of some implementations (which have since been corrected), this
is wrong.

Fixes: 199d101efdba ("v4l: vb2-dma-contig: add prepare/finish to dma-contig allocator")

Signed-off-by: Tiffany Lin <tiffany.lin@mediatek.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/media/v4l2-core/videobuf2-dma-contig.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/media/v4l2-core/videobuf2-dma-contig.c
+++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c
@@ -117,7 +117,8 @@ static void vb2_dc_prepare(void *buf_pri
 	if (!sgt || buf->db_attach)
 		return;
 
-	dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir);
+	dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->orig_nents,
+			       buf->dma_dir);
 }
 
 static void vb2_dc_finish(void *buf_priv)
@@ -129,7 +130,7 @@ static void vb2_dc_finish(void *buf_priv
 	if (!sgt || buf->db_attach)
 		return;
 
-	dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir);
+	dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir);
 }
 
 /*********************************************/


Patches currently in stable-queue which might be from tiffany.lin@mediatek.com are

queue-3.10/media-vb2-dma-contig-fully-cache-synchronise-buffers-in-prepare-and-finish.patch