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dma-mapping fixes for Linux 5.18 

- avoid a double memory copy for swiotlb (Chao Gao)
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Merge tag 'dma-mapping-5.18-2' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fix from Christoph Hellwig:

 - avoid a double memory copy for swiotlb (Chao Gao)

* tag 'dma-mapping-5.18-2' of git://git.infradead.org/users/hch/dma-mapping:
  dma-direct: avoid redundant memory sync for swiotlb
This commit is contained in:
Linus Torvalds 2022-04-16 11:20:21 -07:00
parent 59250f8a7f 9e02977bfa
commit b00868396d
1 changed files with 2 additions and 1 deletions
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3
kernel/dma/direct.h
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@ -114,6 +114,7 @@ static inline void dma_direct_unmap_page(struct device *dev, dma_addr_t addr,
dma_direct_sync_single_for_cpu(dev, addr, size, dir);
if (unlikely(is_swiotlb_buffer(dev, phys)))
swiotlb_tbl_unmap_single(dev, phys, size, dir, attrs);
swiotlb_tbl_unmap_single(dev, phys, size, dir,
attrs | DMA_ATTR_SKIP_CPU_SYNC);
}
#endif /* _KERNEL_DMA_DIRECT_H */