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| author | Andrew Morton <akpm@linux-foundation.org> | 2011-11-02 21:39:33 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-11-03 00:07:02 +0100 |
| commit | 842fa69f3e0c9a178b294e7af7c07f4c9d9e7af2 (patch) | |
| tree | 5c7b18074454b5ffa8e11175cfe7de08e6549ca7 /Documentation | |
| parent | sysctl: make CONFIG_SYSCTL_SYSCALL default to n (diff) | |
| download | linux-842fa69f3e0c9a178b294e7af7c07f4c9d9e7af2.tar.xz linux-842fa69f3e0c9a178b294e7af7c07f4c9d9e7af2.zip | |
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')
| -rw-r--r-- | Documentation/DMA-API.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt index fe2326906610..66bd97a95f10 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) |