2.6.36-stable review patch. If anyone has any objections, please let us know.
------------------
From: Suresh Siddha <suresh.b.sid...@intel.com>
commit 7f99d946e71e71d484b7543b49e990508e70d0c0 upstream.
Fault handling is getting enabled after enabling the interrupt-remapping (as
the success of interrupt-remapping can affect the apic mode and hence the
fault handling mode).
Hence there can potentially be some faults between the window of enabling
interrupt-remapping in the vt-d and the fault-handling of the vt-d units.
Handle any previous faults after enabling the vt-d fault handling.
For v2.6.38 cleanup, need to check if we can remove the dmar_fault() in the
enable_intr_remapping() and see if we can enable fault handling along with
enabling intr-remapping.
Signed-off-by: Suresh Siddha <suresh.b.sid...@intel.com>
LKML-Reference: <20101201062244.630417...@intel.com>
Acked-by: Chris Wright <chr...@sous-sol.org>
Signed-off-by: H. Peter Anvin <h...@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gre...@suse.de>
---
drivers/pci/dmar.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -1414,6 +1414,11 @@ int __init enable_drhd_fault_handling(vo
(unsigned long long)drhd->reg_base_addr, ret);
return -1;
}
+
+ /*
+ * Clear any previous faults.
+ */
+ dmar_fault(iommu->irq, iommu);
}
return 0;
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