Patch "media: saa7146: use sg_dma_len when building pgtable" has been added to the 5.10-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

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

    media: saa7146: use sg_dma_len when building pgtable

to the 5.10-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-saa7146-use-sg_dma_len-when-building-pgtable.patch
and it can be found in the queue-5.10 subdirectory.

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



commit 541303f8de2aa9168de4ec8e2d917d34048814d5
Author: Tasos Sahanidis <tasos@xxxxxxxxxxxx>
Date:   Wed Mar 3 19:52:53 2021 +0100

    media: saa7146: use sg_dma_len when building pgtable
    
    [ Upstream commit e56429b09d5e0802b86f84ec7c24025886c9f88b ]
    
    The new AMD IOMMU DMA implementation concatenates sglist entries under
    certain conditions, and because saa7146 accessed the length member
    directly, it did not support this scenario.
    
    This fixes IO_PAGE_FAULTs by using the sg_dma_len macro.
    
    Fixes: be62dbf554c5 ("iommu/amd: Convert AMD iommu driver to the dma-iommu api")
    Signed-off-by: Tasos Sahanidis <tasos@xxxxxxxxxxxx>
    Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
    Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/media/common/saa7146/saa7146_core.c b/drivers/media/common/saa7146/saa7146_core.c
index 21fb16cc5ca1..e43edb0d76f4 100644
--- a/drivers/media/common/saa7146/saa7146_core.c
+++ b/drivers/media/common/saa7146/saa7146_core.c
@@ -253,7 +253,7 @@ int saa7146_pgtable_build_single(struct pci_dev *pci, struct saa7146_pgtable *pt
 			 i, sg_dma_address(list), sg_dma_len(list),
 			 list->offset);
 */
-		for (p = 0; p * 4096 < list->length; p++, ptr++) {
+		for (p = 0; p * 4096 < sg_dma_len(list); p++, ptr++) {
 			*ptr = cpu_to_le32(sg_dma_address(list) + p * 4096);
 			nr_pages++;
 		}
diff --git a/drivers/media/common/saa7146/saa7146_video.c b/drivers/media/common/saa7146/saa7146_video.c
index ccd15b4d4920..0d1be4042a40 100644
--- a/drivers/media/common/saa7146/saa7146_video.c
+++ b/drivers/media/common/saa7146/saa7146_video.c
@@ -247,9 +247,8 @@ static int saa7146_pgtable_build(struct saa7146_dev *dev, struct saa7146_buf *bu
 
 		/* walk all pages, copy all page addresses to ptr1 */
 		for (i = 0; i < length; i++, list++) {
-			for (p = 0; p * 4096 < list->length; p++, ptr1++) {
+			for (p = 0; p * 4096 < sg_dma_len(list); p++, ptr1++)
 				*ptr1 = cpu_to_le32(sg_dma_address(list) - list->offset);
-			}
 		}
 /*
 		ptr1 = pt1->cpu;