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arm64: default to the direct mapping in get_arch_dma_ops 

Otherwise the direct mapping won't work at all given that a NULL
dev->dma_ops causes a fallback.  Note that we already explicitly set
dev->dma_ops to dma_dummy_ops for dma-incapable devices, so this
fallback should not be needed anyway.

Fixes: 356da6d0cd ("dma-mapping: bypass indirect calls for dma-direct")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
This commit is contained in:
Christoph Hellwig 2018-12-14 15:18:08 +01:00
parent 664204410a
commit 9ab91e7c5c
1 changed files with 1 additions and 5 deletions
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6
arch/arm64/include/asm/dma-mapping.h
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@ -26,11 +26,7 @@
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
{
/*
* We expect no ISA devices, and all other DMA masters are expected to
* have someone call arch_setup_dma_ops at device creation time.
*/
return &dma_dummy_ops;
return NULL;
}
void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,