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dma-mapping: don't BUG when calling dma_map_resource on RAM 

Use WARN_ON_ONCE to print a stack trace and return a proper error
code instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
hifive-unleashed-5.1
Christoph Hellwig 2019-01-04 17:17:53 +01:00
parent cfced78696
commit 645386dfe6
1 changed files with 2 additions and 1 deletions
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3
include/linux/dma-mapping.h
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@ -353,7 +353,8 @@ static inline dma_addr_t dma_map_resource(struct device *dev,
BUG_ON(!valid_dma_direction(dir));
/* Don't allow RAM to be mapped */
BUG_ON(pfn_valid(PHYS_PFN(phys_addr)));
if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr))))
return DMA_MAPPING_ERROR;
if (dma_is_direct(ops))
addr = dma_direct_map_resource(dev, phys_addr, size, dir, attrs);