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authorChristoph Hellwig <hch@lst.de>2018-02-02 11:51:14 +0300
committerChristoph Hellwig <hch@lst.de>2018-02-12 18:59:07 +0300
commit42ed64524d846b96afaa8b3f9ba045bcaf11ab0f (patch)
treef17b858f39a0f224dd76109e3a972b68f55aba55 /lib
parentf25e6f6b4eae7e25e92e91a570cae84bf83e751a (diff)
downloadlinux-42ed64524d846b96afaa8b3f9ba045bcaf11ab0f.tar.xz
dma-direct: comment the dma_direct_free calling convention
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'lib')
-rw-r--r--lib/dma-direct.c4
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)
{