linux-kernel - [PATCH] x86: dma-mapping: fix broken allocation when dma

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Message-id: <1339567046-2264-1-git-send-email-m.szyprowski@samsung.com>
Date:	Wed, 13 Jun 2012 07:57:26 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	x86@...nel.org, linux-kernel@...r.kernel.org
Cc:	Michal Nazarewicz <mina86@...a86.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Konrad Rzeszutek Wilk <konrad@...nok.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: [PATCH] x86: dma-mapping: fix broken allocation when dma_mask has been
 provided

Commit 0a2b9a6ea93 ("X86: integrate CMA with DMA-mapping subsystem")
broke memory allocation with dma_mask. This patch fixes possible kernel
ops caused by lack of resetting page variable when jumping to 'again' label.

Reported-by: Konrad Rzeszutek Wilk <konrad@...nok.org>
Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
---
 arch/x86/kernel/pci-dma.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 62c9457..c0f420f 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -100,7 +100,7 @@ void *dma_generic_alloc_coherent(struct device *dev, size_t size,
 				 struct dma_attrs *attrs)
 {
 	unsigned long dma_mask;
-	struct page *page = NULL;
+	struct page *page;
 	unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
 	dma_addr_t addr;
 
@@ -108,6 +108,7 @@ void *dma_generic_alloc_coherent(struct device *dev, size_t size,
 
 	flag |= __GFP_ZERO;
 again:
+	page = NULL;
 	if (!(flag & GFP_ATOMIC))
 		page = dma_alloc_from_contiguous(dev, count, get_order(size));
 	if (!page)
-- 
1.7.1.569.g6f426

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