Patch "[media] media: vb2 dma-sg: Fully cache synchronise buffers in prepare and finish" has been added to the 4.3-stable tree

Patch "[media] media: vb2 dma-sg: Fully cache synchronise buffers in prepare and finish" has been added to the 4.3-stable tree

[gregkh]

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

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

to the 4.3-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-sg-fully-cache-synchronise-buffers-in-prepare-and-finish.patch
and it can be found in the queue-4.3 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 418dae2276065680bde7ae27d2c075e612a54de6 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-sg: Fully cache synchronise buffers in prepare and finish

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

commit 418dae2276065680bde7ae27d2c075e612a54de6 upstream.

In videobuf2 dma-sg memory types 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: d790b7eda953 ("vb2-dma-sg: move dma_(un)map_sg here")

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-sg.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/media/v4l2-core/videobuf2-dma-sg.c
+++ b/drivers/media/v4l2-core/videobuf2-dma-sg.c
@@ -210,7 +210,8 @@ static void vb2_dma_sg_prepare(void *buf
 	if (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_dma_sg_finish(void *buf_priv)
@@ -222,7 +223,7 @@ static void vb2_dma_sg_finish(void *buf_
 	if (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);
 }
 
 static void *vb2_dma_sg_get_userptr(void *alloc_ctx, unsigned long vaddr,


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

queue-4.3/media-vb2-dma-sg-fully-cache-synchronise-buffers-in-prepare-and-finish.patch
queue-4.3/media-vb2-dma-contig-fully-cache-synchronise-buffers-in-prepare-and-finish.patch