]> git.baikalelectronics.ru Git - kernel.git/commit
swiotlb: Skip cache maintenance on map error
authorRobin Murphy <robin.murphy@arm.com>
Wed, 21 Nov 2018 16:00:51 +0000 (16:00 +0000)
committerChristoph Hellwig <hch@lst.de>
Wed, 21 Nov 2018 17:47:58 +0000 (18:47 +0100)
commit2a58a3505cd5c531006dba1e51777fa6381b5c6a
tree4c1d102f7214ba97b3a43a1af8ba9495e23f3d76
parent34b198f34bd0d3dc929800f70586bf9cd6ce74c7
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: 7aef780128fe ("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>
kernel/dma/swiotlb.c