From: CMY <cmy@rock-chips.com>
Date: Sat, 14 Feb 2015 08:03:06 +0000 (+0800)
Subject: ARM64: dma-mapping: zero the buffer that allocate with __GFP_ZERO flags
X-Git-Tag: firefly_0821_release~4158^2~446
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=fca343c4d5b0424a378018b1f79ded2c18242c30;p=firefly-linux-kernel-4.4.55.git

ARM64: dma-mapping: zero the buffer that allocate with __GFP_ZERO flags
---

diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index eeb1cf3ff299..aff368c35d62 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -158,6 +158,9 @@ static void *__dma_alloc_noncoherent(struct device *dev, size_t size,
 	if (!ptr)
 		goto no_mem;
 
+	if (flags & __GFP_ZERO)
+		memset(ptr, 0, size);
+
 	/* remove any dirty cache lines on the kernel alias */
 	__dma_flush_range(ptr, ptr + size);