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media: saa7146: use sg_dma_len when building pgtable

Message ID 7cb84acf-1bb5-9440-a97a-4c3e69d75760@tasossah.com
State Accepted
Commit e56429b09d5e0802b86f84ec7c24025886c9f88b
Headers show
Series media: saa7146: use sg_dma_len when building pgtable | expand

Commit Message

Tasos Sahanidis March 3, 2021, 6:52 p.m. UTC 
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>
---
 drivers/media/common/saa7146/saa7146_core.c  | 2 +-
 drivers/media/common/saa7146/saa7146_video.c | 3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)
diff mbox series

Patch

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;