Commit 205e1b7f authored Dec 22, 2017 by Christoph Hellwig

dma-mapping: warn when there is no coherent_dma_mask



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>

parent 4b1b62b6

include/linux/dma-mapping.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -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;