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dma-direct: comment the dma_direct_free calling convention

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Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2018-02-02 09:51:14 +01:00
parent f25e6f6b4e
commit 42ed64524d
1 changed files with 4 additions and 0 deletions
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4
lib/dma-direct.c
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@ -84,6 +84,10 @@ again:
return page_address(page);
}
/*
* NOTE: this function must never look at the dma_addr argument, because we want
* to be able to use it as a helper for iommu implementations as well.
*/
void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_addr, unsigned long attrs)
{