On Oct. 24, 2007, 10:32 +0200, Jens Axboe <[email protected]> wrote:
> On Wed, Oct 24 2007, FUJITA Tomonori wrote:
>> On Tue, 23 Oct 2007 20:49:40 +0530
>> Kamalesh Babulal <[email protected]> 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;
I don't see this could fix anything since "s" above and "start" here are still
dereferenced. Also, this makes sout->dma_address inconsistent with sout->page_link
and with the end marker.
Benny
>> sout->dma_length = start->length;
>> return 0;
>> }
>> --
>> 1.5.2.4
>
> Care to write up a proper changelog?
>
-
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