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x86/amd-iommu: Reset command buffer if wait loop fails

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

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel
2009-09-03 15:15:10 +02:00
parent b26e81b871
commit 6a1eddd2f9
1 changed files with 5 additions and 2 deletions
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7
arch/x86/kernel/amd_iommu.c
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@@ -318,8 +318,11 @@ static void __iommu_wait_for_completion(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)) if (unlikely(i == EXIT_LOOP_COUNT)) {
panic("AMD IOMMU: Completion wait loop failed\n"); spin_unlock(&iommu->lock);
reset_iommu_command_buffer(iommu);
spin_lock(&iommu->lock);
}
} }
/* /*