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authorAndrew Morton <akpm@linux-foundation.org>2011-11-02 13:39:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-11-02 16:07:02 -0700
commit842fa69f3e0c9a178b294e7af7c07f4c9d9e7af2 (patch)
tree5c7b18074454b5ffa8e11175cfe7de08e6549ca7 /Documentation/DMA-API.txt
parentc736de60aed869df8a9aba512cdaf89e32545b00 (diff)
downloadlinux-842fa69f3e0c9a178b294e7af7c07f4c9d9e7af2.tar.gz
include/linux/dma-mapping.h: add dma_zalloc_coherent()
Lots of driver code does a dma_alloc_coherent() and then zeroes out the memory with a memset. Make it easy for them. Cc: Alexandre Bounine <alexandre.bounine@idt.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/DMA-API.txt')
-rw-r--r--Documentation/DMA-API.txt7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt
index fe232690661..66bd97a95f1 100644
--- a/Documentation/DMA-API.txt
+++ b/Documentation/DMA-API.txt
@@ -50,6 +50,13 @@ specify the GFP_ flags (see kmalloc) for the allocation (the
implementation may choose to ignore flags that affect the location of
the returned memory, like GFP_DMA).
+void *
+dma_zalloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t flag)
+
+Wraps dma_alloc_coherent() and also zeroes the returned memory if the
+allocation attempt succeeded.
+
void
dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_handle)