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>

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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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drivers/iommu/dma-iommu.c

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