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| author | Robin Murphy <robin.murphy@arm.com> | 2017-01-25 18:31:31 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2017-01-26 12:25:14 +0000 |
| commit | adbe7e26f4257f72817495b9bce114284060b0d7 (patch) | |
| tree | 0cd0d2d34090578eaa7b75b97c83e5386bb599cf /arch/arm64/mm/dma-mapping.c | |
| parent | 2e449048a25eb75d48dff12882b93f26d130a1c6 (diff) | |
| download | blackbird-obmc-linux-adbe7e26f4257f72817495b9bce114284060b0d7.tar.gz blackbird-obmc-linux-adbe7e26f4257f72817495b9bce114284060b0d7.zip | |
arm64: dma-mapping: Fix dma_mapping_error() when bypassing SWIOTLB
When bypassing SWIOTLB on small-memory systems, we need to avoid calling
into swiotlb_dma_mapping_error() in exactly the same way as we avoid
swiotlb_dma_supported(), because the former also relies on SWIOTLB state
being initialised.
Under the assumptions for which we skip SWIOTLB, dma_map_{single,page}()
will only ever return the DMA-offset-adjusted physical address of the
page passed in, thus we can report success unconditionally.
Fixes: b67a8b29df7e ("arm64: mm: only initialize swiotlb when necessary")
CC: stable@vger.kernel.org
CC: Jisheng Zhang <jszhang@marvell.com>
Reported-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/mm/dma-mapping.c')
| -rw-r--r-- | arch/arm64/mm/dma-mapping.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c index 0ec1ae933342..7ce2b78a72b9 100644 --- a/arch/arm64/mm/dma-mapping.c +++ b/arch/arm64/mm/dma-mapping.c @@ -356,6 +356,13 @@ static int __swiotlb_dma_supported(struct device *hwdev, u64 mask) return 1; } +static int __swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t addr) +{ + if (swiotlb) + return swiotlb_dma_mapping_error(hwdev, addr); + return 0; +} + static struct dma_map_ops swiotlb_dma_ops = { .alloc = __dma_alloc, .free = __dma_free, @@ -370,7 +377,7 @@ static struct dma_map_ops swiotlb_dma_ops = { .sync_sg_for_cpu = __swiotlb_sync_sg_for_cpu, .sync_sg_for_device = __swiotlb_sync_sg_for_device, .dma_supported = __swiotlb_dma_supported, - .mapping_error = swiotlb_dma_mapping_error, + .mapping_error = __swiotlb_dma_mapping_error, }; static int __init atomic_pool_init(void) |
