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AMD IOMMU: panic if completion wait loop fails 

Impact: prevents data corruption after a failed completion wait loop

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2008-12-17 16:36:44 +01:00
parent cf558d25e5
commit 84df817595
1 changed files with 3 additions and 2 deletions
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5
arch/x86/kernel/amd_iommu.c
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@ -235,8 +235,9 @@ static int iommu_completion_wait(struct amd_iommu *iommu)
status &= ~MMIO_STATUS_COM_WAIT_INT_MASK; status &= ~MMIO_STATUS_COM_WAIT_INT_MASK;
writel(status, iommu->mmio_base + MMIO_STATUS_OFFSET); writel(status, iommu->mmio_base + MMIO_STATUS_OFFSET);
if (unlikely((i == EXIT_LOOP_COUNT) && printk_ratelimit())) if (unlikely(i == EXIT_LOOP_COUNT))
printk(KERN_WARNING "AMD IOMMU: Completion wait loop failed\n"); panic("AMD IOMMU: Completion wait loop failed\n");
out: out:
spin_unlock_irqrestore(&iommu->lock, flags); spin_unlock_irqrestore(&iommu->lock, flags);