linux-kernel - Re: [BUG] 2.6.23-git18 Kernel oops in sg helpers

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Message-Id: <20071024074200K.fujita.tomonori@lab.ntt.co.jp>
Date:	Wed, 24 Oct 2007 07:42:00 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	kamalesh@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org, jens.axboe@...cle.com,
	apw@...dowen.org, tomof@....org
Subject: Re: [BUG] 2.6.23-git18 Kernel oops in sg helpers

On Tue, 23 Oct 2007 20:49:40 +0530
Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com> wrote:

> Hi,
> 
> Kernel oops is triggered while running fsx-linux test, followed by cpu softlock
> over the AMD box
> 
> Unable to handle kernel NULL pointer dereference at 0000000000000018 RIP: 
>  [<ffffffff8021f2f6>] gart_map_sg+0x26c/0x406
> PGD 10185b067 PUD 10075b067 PMD 0 

Does this work?


diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index c56e9ee..ae7e016 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -338,7 +338,6 @@ static int __dma_map_cont(struct scatterlist *start, int nelems,
 		
 		BUG_ON(s != start && s->offset);
 		if (s == start) {
-			*sout = *s; 
 			sout->dma_address = iommu_bus_base;
 			sout->dma_address += iommu_page*PAGE_SIZE + s->offset;
 			sout->dma_length = s->length;
@@ -365,7 +364,7 @@ static inline int dma_map_cont(struct scatterlist *start, int nelems,
 {
 	if (!need) {
 		BUG_ON(nelems != 1);
-		*sout = *start;
+		sout->dma_address = start->dma_address;
 		sout->dma_length = start->length;
 		return 0;
 	}
-- 
1.5.2.4

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