Signed-off-by: Christoph Hellwig <h...@lst.de>
---
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 @@ void *dma_direct_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle,
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)
{
--
2.14.2
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