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: Joerg Roedel <joerg.roedel@amd.com>
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index b62a2f6..cfca80b 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -318,8 +318,11 @@
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);
+ }
}
/*