[Xen-changelog] [linux-2.6.18-xen] linux/x86: dma_map_sg(): BUG_ON() before use

["Xen patchbot-linux-2.6.18-xen" <patchbot-linux-2.6.18-xen@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1196956092 0
# Node ID 95256f8bb7ca9825a6f4d28937186f478cffd56d
# Parent  2151287a5eb9d8133f7ae9781d7d529e9c0f897d
linux/x86: dma_map_sg(): BUG_ON() before use
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
---
 arch/i386/kernel/pci-dma-xen.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -r 2151287a5eb9 -r 95256f8bb7ca arch/i386/kernel/pci-dma-xen.c
--- a/arch/i386/kernel/pci-dma-xen.c    Thu Dec 06 15:46:25 2007 +0000
+++ b/arch/i386/kernel/pci-dma-xen.c    Thu Dec 06 15:48:12 2007 +0000
@@ -91,10 +91,10 @@ 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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