All memory allocation functions have a pendant for allocating zeroed
memory, but dmam_alloc_coherent does not have such a pendant.
However, it is easier to read dmam_zalloc_coherent than passing an extra
flag or, even worse, see memset() after the allocation.
This patch adds an inline function dmam_zalloc_coherent(), exactly like
the implementation of dma_zalloc_coherent().
Signed-off-by: Michael Moese <michael.mo...@men.de>
---
include/linux/dma-mapping.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 03c0196a6f24..cf6cbda76ee2 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -761,6 +761,15 @@ extern void dmam_free_coherent(struct device *dev, size_t
size, void *vaddr,
extern void *dmam_alloc_attrs(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp,
unsigned long attrs);
+
+static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t flag)
+{
+ void *ret = dmam_alloc_coherent(dev, size, dma_handle,
+ flag | __GFP_ZERO);
+ return ret;
+}
+
#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
extern int dmam_declare_coherent_memory(struct device *dev,
phys_addr_t phys_addr,
--
2.13.1
