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;