Document the dma_pool_zalloc() wrapper.

Signed-off-by: Petr Tesarik <ptesarik@suse.com>
---
 Documentation/core-api/mm-api.rst | 2 ++
 include/linux/dmapool.h           | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/Documentation/core-api/mm-api.rst b/Documentation/core-api/mm-api.rst
index af8151db88b2..a61766328ac0 100644
--- a/Documentation/core-api/mm-api.rst
+++ b/Documentation/core-api/mm-api.rst
@@ -97,6 +97,8 @@ DMA pools
 .. kernel-doc:: mm/dmapool.c
    :export:
 
+.. kernel-doc:: include/linux/dmapool.h
+
 More Memory Management Functions
 ================================
 
diff --git a/include/linux/dmapool.h b/include/linux/dmapool.h
index 06c4de602b2f..c0c7717d3ae7 100644
--- a/include/linux/dmapool.h
+++ b/include/linux/dmapool.h
@@ -60,6 +60,14 @@ static inline struct dma_pool *dma_pool_create(const char *name,
 				    NUMA_NO_NODE);
 }
 
+/**
+ * dma_pool_zalloc - Get a zero-initialized block of DMA coherent memory.
+ * @pool: dma pool that will produce the block
+ * @mem_flags: GFP_* bitmask
+ * @handle: pointer to dma address of block
+ *
+ * Same as @dma_pool_alloc, but the returned memory is zeroed.
+ */
 static inline void *dma_pool_zalloc(struct dma_pool *pool, gfp_t mem_flags,
 				    dma_addr_t *handle)
 {
-- 
2.49.0