linux-kernel - [PATCH 27/28] x86: don't do dma if mask is NULL.

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Date:	Tue,  8 Apr 2008 13:21:09 -0300
From:	Glauber Costa <gcosta@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, glommer@...il.com, mingo@...e.hu,
	tglx@...utronix.de, kvm-devel@...ts.sourceforge.net,
	amit.shah@...ranet.com, avi@...ranet.com,
	Glauber Costa <gcosta@...hat.com>
Subject: [PATCH 27/28] x86: don't do dma if mask is NULL.

if the device hasn't provided a mask, abort allocation.
Note that we're using a fallback device now, so it does not cover
the case of a NULL device: just drivers passing NULL masks around.

Signed-off-by: Glauber Costa <gcosta@...hat.com>
---
 arch/x86/kernel/pci-dma_32.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/pci-dma_32.c b/arch/x86/kernel/pci-dma_32.c
index f134de3..d2f7074 100644
--- a/arch/x86/kernel/pci-dma_32.c
+++ b/arch/x86/kernel/pci-dma_32.c
@@ -91,6 +91,9 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
 	if (dma_mask == 0)
 		dma_mask = DMA_32BIT_MASK;
 
+	if (dev->dma_mask == NULL)
+		return NULL;
+
 	/* Don't invoke OOM killer */
 	gfp |= __GFP_NORETRY;
 again:
-- 
1.5.0.6

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