dma-direct: comment the dma_direct_free calling convention

Web:        https://git.kernel.org/torvalds/c/42ed64524d846b96afaa8b3f9ba045bcaf11ab0f
Commit:     42ed64524d846b96afaa8b3f9ba045bcaf11ab0f
Parent:     f25e6f6b4eae7e25e92e91a570cae84bf83e751a
Refname:    refs/heads/master
Author:     Christoph Hellwig <[email protected]>
AuthorDate: Fri Feb 2 09:51:14 2018 +0100
Committer:  Christoph Hellwig <[email protected]>
CommitDate: Mon Feb 12 15:59:07 2018 +0000

    dma-direct: comment the dma_direct_free calling convention
    
    Signed-off-by: Christoph Hellwig <[email protected]>
---
 lib/dma-direct.c | 4 ++++
 1 file changed, 4 insertions(+)

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)
 {
--
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