From ad82362b2defd4adad87d8538617b2f51a4bf9c3 Mon Sep 17 00:00:00 2001 From: "Sean O. Stalley" Date: Tue, 8 Sep 2015 15:02:27 -0700 Subject: [PATCH] mm: add dma_pool_zalloc() call to DMA API Add a wrapper function for dma_pool_alloc() to get zeroed memory. Signed-off-by: Sean O. Stalley Cc: Vinod Koul Cc: Bjorn Helgaas Cc: Gilles Muller Cc: Nicolas Palix Cc: Michal Marek Cc: Sebastian Andrzej Siewior Cc: Jonathan Corbet Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/DMA-API.txt | 7 +++++++ include/linux/dmapool.h | 6 ++++++ 2 files changed, 13 insertions(+) diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt index 7eba542eff7c..edccacd4f048 100644 --- a/Documentation/DMA-API.txt +++ b/Documentation/DMA-API.txt @@ -104,6 +104,13 @@ crossing restrictions, pass 0 for alloc; passing 4096 says memory allocated from this pool must not cross 4KByte boundaries. + void *dma_pool_zalloc(struct dma_pool *pool, gfp_t mem_flags, + dma_addr_t *handle) + +Wraps dma_pool_alloc() and also zeroes the returned memory if the +allocation attempt succeeded. + + void *dma_pool_alloc(struct dma_pool *pool, gfp_t gfp_flags, dma_addr_t *dma_handle); diff --git a/include/linux/dmapool.h b/include/linux/dmapool.h index e1043f79122f..53ba737505df 100644 --- a/include/linux/dmapool.h +++ b/include/linux/dmapool.h @@ -24,6 +24,12 @@ void dma_pool_destroy(struct dma_pool *pool); void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags, dma_addr_t *handle); +static inline void *dma_pool_zalloc(struct dma_pool *pool, gfp_t mem_flags, + dma_addr_t *handle) +{ + return dma_pool_alloc(pool, mem_flags | __GFP_ZERO, handle); +} + void dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t addr); /* -- 2.20.1