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media: saa7134: use sg_dma_len when building pgtable 

The new AMD IOMMU DMA implementation concatenates sglist entries under
certain conditions, and because saa7134 accessed the length member
directly, it did not support this scenario.

This fixes IO_PAGE_FAULTs and choppy DMA audio by using the
sg_dma_len macro.

Fixes: be62dbf554 ("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>
This commit is contained in:
Tasos Sahanidis 2021-03-03 19:30:18 +01:00 committed by Mauro Carvalho Chehab
parent a4184b4f99
commit 4e1cb753c0
1 changed files with 1 additions and 1 deletions
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2
drivers/media/pci/saa7134/saa7134-core.c
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@ -243,7 +243,7 @@ int saa7134_pgtable_build(struct pci_dev *pci, struct saa7134_pgtable *pt,
ptr = pt->cpu + startpage;
for (i = 0; i < length; i++, list = sg_next(list)) {
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) +
list->offset + p * 4096);
}