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swiotlb: Skip cache maintenance on map error

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If swiotlb_bounce_page() failed, calling arch_sync_dma_for_device() may
lead to such delights as performing cache maintenance on whatever
address phys_to_virt(SWIOTLB_MAP_ERROR) looks like, which is typically
outside the kernel memory map and goes about as well as expected.

Don't do that.

Fixes: a4a4330db4 ("swiotlb: add support for non-coherent DMA")
Tested-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Robin Murphy 2018-11-21 16:00:51 +00:00 committed by Christoph Hellwig
parent b34087157d
commit cb216b84d6
1 changed files with 2 additions and 1 deletions
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3
kernel/dma/swiotlb.c
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@ -679,7 +679,8 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
}
if (!dev_is_dma_coherent(dev) &&
(attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
(attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0 &&
dev_addr != DIRECT_MAPPING_ERROR)
arch_sync_dma_for_device(dev, phys, size, dir);
return dev_addr;