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| author | Christoph Hellwig <hch@lst.de> | 2018-02-02 09:51:14 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2018-02-12 15:59:07 +0000 |
| commit | 42ed64524d846b96afaa8b3f9ba045bcaf11ab0f (patch) | |
| tree | f17b858f39a0f224dd76109e3a972b68f55aba55 | |
| parent | f25e6f6b4eae7e25e92e91a570cae84bf83e751a (diff) | |
| download | linux-42ed64524d846b96afaa8b3f9ba045bcaf11ab0f.tar.bz2 | |
dma-direct: comment the dma_direct_free calling convention
Signed-off-by: Christoph Hellwig <hch@lst.de>
| -rw-r--r-- | lib/dma-direct.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/dma-direct.c b/lib/dma-direct.c index fdc733cf9e30..c9e8e21cb334 100644 --- a/lib/dma-direct.c +++ b/lib/dma-direct.c @@ -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) { |