Jan Beulich
2007-Dec-06 15:44 UTC
[Xen-devel] [PATCH] linux/x86: dma_map_dg(): BUG_ON() before use
As usual, written and tested against 2.6.24-rc3 and made apply against
2.6.18 without further testing.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Index: head-2007-11-30/arch/i386/kernel/pci-dma-xen.c
==================================================================---
head-2007-11-30.orig/arch/i386/kernel/pci-dma-xen.c 2007-12-04
14:52:27.000000000 +0100
+++ head-2007-11-30/arch/i386/kernel/pci-dma-xen.c 2007-12-04 14:54:28.000000000
+0100
@@ -92,10 +92,10 @@ dma_map_sg(struct device *hwdev, struct
rc = swiotlb_map_sg(hwdev, sg, nents, direction);
} else {
for (i = 0; i < nents; i++ ) {
+ BUG_ON(!sg[i].page);
sg[i].dma_address gnttab_dma_map_page(sg[i].page) + sg[i].offset;
sg[i].dma_length = sg[i].length;
- BUG_ON(!sg[i].page);
IOMMU_BUG_ON(address_needs_mapping(
hwdev, sg[i].dma_address));
IOMMU_BUG_ON(range_straddles_page_boundary(
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