For use by functions that want a zeroed buffer for DMA use, implement
dma_zalloc(). Having this in a single place instead of open-coding makes
it easier in future to possibly optimize zeroing of the buffer and makes
follow-up changes more concise.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
drivers/dma/map.c | 11 +++++++++++
include/dma.h | 6 ++++++
2 files changed, 17 insertions(+)
diff --git a/drivers/dma/map.c b/drivers/dma/map.c
index ed7d3b68ffb1..e2656a27f183 100644
--- a/drivers/dma/map.c
+++ b/drivers/dma/map.c
@@ -7,6 +7,17 @@ void *dma_alloc(size_t size)
return xmemalign(DMA_ALIGNMENT, ALIGN(size, DMA_ALIGNMENT));
}
+void *dma_zalloc(size_t size)
+{
+ void *buf;
+
+ buf = dma_alloc(size);
+ if (buf)
+ memset(buf, 0x00, size);
+
+ return buf;
+}
+
void dma_sync_single_for_cpu(struct device *dev, dma_addr_t address,
size_t size, enum dma_data_direction dir)
{
diff --git a/include/dma.h b/include/dma.h
index 0b77949eaf05..a69072280bd5 100644
--- a/include/dma.h
+++ b/include/dma.h
@@ -23,11 +23,17 @@
#ifdef CONFIG_HAS_DMA
void *dma_alloc(size_t size);
+void *dma_zalloc(size_t size);
#else
static inline void *dma_alloc(size_t size)
{
return malloc(size);
}
+
+static inline void *dma_zalloc(size_t size)
+{
+ return calloc(size, 1);
+}
#endif
static inline void dma_free(void *mem)
--
2.39.2
