From: Tasos Sahanidis Date: Wed, 3 Mar 2021 18:30:18 +0000 (+0100) Subject: media: saa7134: use sg_dma_len when building pgtable X-Git-Tag: v5.11.21~284 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c4af36132cfc70fa414b3a6f378e1b59186bf9b9;p=thirdparty%2Fkernel%2Fstable.git media: saa7134: use sg_dma_len when building pgtable [ Upstream commit 4e1cb753c04d74e06d7ca826ea0bcb02526af03e ] 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: be62dbf554c5 ("iommu/amd: Convert AMD iommu driver to the dma-iommu api") Signed-off-by: Tasos Sahanidis Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- diff --git a/drivers/media/pci/saa7134/saa7134-core.c b/drivers/media/pci/saa7134/saa7134-core.c index 391572a6ec76a..efb757d5168a6 100644 --- a/drivers/media/pci/saa7134/saa7134-core.c +++ b/drivers/media/pci/saa7134/saa7134-core.c @@ -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); }