From bb8ada95a7c11adf3dad4e8d5c55ef1650560592 Mon Sep 17 00:00:00 2001 From: Glauber Costa Date: Wed, 9 Apr 2008 13:18:09 -0300 Subject: [PATCH] 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 Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/x86/kernel/pci-dma_32.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kernel/pci-dma_32.c b/arch/x86/kernel/pci-dma_32.c index f134de3833..d2f70744a9 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: -- 2.39.5