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Commit 84df8175 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

AMD IOMMU: panic if completion wait loop fails 



Impact: prevents data corruption after a failed completion wait loop

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent cf558d25

arch/x86/kernel/amd_iommu.c

+3 −2
Original line number Diff line number Diff line
@@ -235,8 +235,9 @@ static int iommu_completion_wait(struct amd_iommu *iommu) 
	status &= ~MMIO_STATUS_COM_WAIT_INT_MASK;

	writel(status, iommu->mmio_base + MMIO_STATUS_OFFSET);



	if (unlikely((i == EXIT_LOOP_COUNT) && printk_ratelimit()))

		printk(KERN_WARNING "AMD IOMMU: Completion wait loop failed\n");

	if (unlikely(i == EXIT_LOOP_COUNT))

		panic("AMD IOMMU: Completion wait loop failed\n");



out:

	spin_unlock_irqrestore(&iommu->lock, flags);