dma-direct: comment the dma_direct_free calling convention
Signed-off-by: Christoph Hellwig <hch@lst.de>
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@ -84,6 +84,10 @@ again:
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return page_address(page);
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return page_address(page);
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}
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}
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/*
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* NOTE: this function must never look at the dma_addr argument, because we want
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* to be able to use it as a helper for iommu implementations as well.
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*/
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void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
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void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
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dma_addr_t dma_addr, unsigned long attrs)
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dma_addr_t dma_addr, unsigned long attrs)
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{
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{
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