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amd-iommu: fix an off-by-one error in the AMD IOMMU driver.

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The variable amd_iommu_last_bdf holds the maximum bdf of any device
controlled by an IOMMU, so the number of device entries needed is
amd_iommu_last_bdf+1.  The function tbl_size used amd_iommu_last_bdf
instead.  This would be a problem if the last device were a large
enough power of 2.

[ Impact: fix amd_iommu_last_bdf off-by-one error ]

Signed-off-by: Neil Turton <nturton@solarflare.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Neil Turton 2009-05-14 14:00:35 +01:00 committed by Joerg Roedel
parent 41fb454ebe
commit 421f909c80
1 changed files with 1 additions and 1 deletions
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arch/x86/kernel/amd_iommu_init.c
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@ -175,7 +175,7 @@ static inline void update_last_devid(u16 devid)
static inline unsigned long tbl_size(int entry_size)
{
unsigned shift = PAGE_SHIFT +
get_order(amd_iommu_last_bdf * entry_size);
get_order(((int)amd_iommu_last_bdf + 1) * entry_size);
return 1UL << shift;
}