x86, dmar: start with sane state while enabling dma and interrupt-remapping

Impact: cleanup/sanitization

Start from a sane state while enabling dma and interrupt-remapping, by
clearing the previous recorded faults and disabling previously
enabled queued invalidation and interrupt-remapping.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 1 insertions, 4 deletions

diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index 932e5e3930fc..f1805002e436 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -982,7 +982,7 @@ static int dmar_fault_do_one(struct intel_iommu *iommu, int type,
 }
 
 #define PRIMARY_FAULT_REG_LEN (16)
-static irqreturn_t dmar_fault(int irq, void *dev_id)
+irqreturn_t dmar_fault(int irq, void *dev_id)
 {
         struct intel_iommu *iommu = dev_id;
         int reg, fault_index;
@@ -1074,9 +1074,6 @@ int dmar_set_interrupt(struct intel_iommu *iommu)
                 return 0;
         }
 
-        /* Force fault register is cleared */
-        dmar_fault(irq, iommu);
-
         ret = request_irq(irq, dmar_fault, 0, iommu->name, iommu);
         if (ret)
                 printk(KERN_ERR "IOMMU: can't request irq\n");