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

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 <[email protected]> know about it.

From: Tiffany Lin <[email protected]>
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 <[email protected]>

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.

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

@@ -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 [email protected] 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