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iommu/dma-iommu: Fix wrong scatterlist length assignment in P2PDMA path

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In iommu_dma_map_sg(), when handling PCI P2PDMA cases, the DMA length
of the current scatterlist segment `s` is incorrectly assigned from the
head entry `sg->length` instead of the current entry `s->length`.

This typo causes all P2PDMA segments in the scatterlist to inherit the
length of the first segment, leading to corrupted DMA lengths for multi-
segment scatterlists.

Fix this by using `s->length` instead of `sg->length`.

Fixes: a25e7962db ("PCI/P2PDMA: Refactor the p2pdma mapping helpers")
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Li RongQing 2026-05-30 07:28:52 -04:00 committed by Joerg Roedel
parent 5ff98a0da6
commit db50fb8701
1 changed files with 1 additions and 1 deletions
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2
drivers/iommu/dma-iommu.c
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@ -1465,7 +1465,7 @@ int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
*/
s->dma_address = pci_p2pdma_bus_addr_map(
p2pdma_state.mem, sg_phys(s));
sg_dma_len(s) = sg->length;
sg_dma_len(s) = s->length;
sg_dma_mark_bus_address(s);
continue;
default: