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Commit 6a1eddd2 authored by Joerg Roedel's avatar Joerg Roedel
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x86/amd-iommu: Reset command buffer if wait loop fails 



Instead of a panic on an comletion wait loop failure, try to
recover from that event from resetting the command buffer.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent b26e81b8

arch/x86/kernel/amd_iommu.c

+5 −2
Original line number Diff line number Diff line
@@ -318,8 +318,11 @@ static void __iommu_wait_for_completion(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))

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

	if (unlikely(i == EXIT_LOOP_COUNT)) {

		spin_unlock(&iommu->lock);

		reset_iommu_command_buffer(iommu);

		spin_lock(&iommu->lock);

	}

}



/*