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dma-mapping: warn when there is no coherent_dma_mask

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These days all devices should have a DMA coherent mask, and most dma_ops
implementations rely on that fact.  But just to be sure add an assert to
ring the warning bell if that is not the case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Christoph Hellwig 2017-12-22 14:50:47 +01:00
parent 4b1b62b67d
commit 205e1b7f51
1 changed files with 1 additions and 0 deletions
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include/linux/dma-mapping.h
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@ -513,6 +513,7 @@ static inline void *dma_alloc_attrs(struct device *dev, size_t size,
void *cpu_addr;
BUG_ON(!ops);
WARN_ON_ONCE(dev && !dev->coherent_dma_mask);
if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr))
return cpu_addr;