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| author | Robin Murphy <robin.murphy@arm.com> | 2018-11-21 17:00:51 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2018-11-21 18:47:58 +0100 |
| commit | cb216b84d6ea24fa10f1e7aac35de77246841041 (patch) | |
| tree | 4c1d102f7214ba97b3a43a1af8ba9495e23f3d76 /kernel/dma/swiotlb.c | |
| parent | dma-direct: Make DIRECT_MAPPING_ERROR viable for SWIOTLB (diff) | |
| download | linux-cb216b84d6ea24fa10f1e7aac35de77246841041.tar.xz linux-cb216b84d6ea24fa10f1e7aac35de77246841041.zip | |
swiotlb: Skip cache maintenance on map error
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: a4a4330db46a ("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>
Diffstat (limited to '')
| -rw-r--r-- | kernel/dma/swiotlb.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index 5731daa09a32..045930e32c0e 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -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; |