[PATCH 5.11 318/601] media: saa7146: use sg_dma_len when building pgtable

Greg Kroah-Hartman
2021-05-12T17:31:04Z

From: Tasos Sahanidis <tasos@tasossah.com>

[ 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@tasossah.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/common/saa7146/saa7146_core.c | 2 +-
drivers/media/common/saa7146/saa7146_video.c | 3 +--
2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/media/common/saa7146/saa7146_core.c b/drivers/media/common/saa7146/saa7146_core.c
index f2d13b71416c..e50fa0ff7c5d 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 7b8795eca589..66215d9106a4 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;
--
2.30.2