VT-d: handle Invalidation Queue Error to avoid system hang

[safe/jmp/linux-2.6] / drivers / pci / intr_remapping.c

diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
index f78371b..45effc5 100644 (file)
--- a/drivers/pci/intr_remapping.c
+++ b/drivers/pci/intr_remapping.c
@@ -207,7 +207,7 @@ int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
        return index;
 }
 
-static void qi_flush_iec(struct intel_iommu *iommu, int index, int mask)
+static int qi_flush_iec(struct intel_iommu *iommu, int index, int mask)
 {
        struct qi_desc desc;
 
@@ -215,7 +215,7 @@ static void qi_flush_iec(struct intel_iommu *iommu, int index, int mask)
                   | QI_IEC_SELECTIVE;
        desc.high = 0;
 
-       qi_submit_sync(&desc, iommu);
+       return qi_submit_sync(&desc, iommu);
 }
 
 int map_irq_to_irte_handle(int irq, u16 *sub_handle)
@@ -283,6 +283,7 @@ int clear_irte_irq(int irq, struct intel_iommu *iommu, u16 index)
 
 int modify_irte(int irq, struct irte *irte_modified)
 {
+       int rc;
        int index;
        struct irte *irte;
        struct intel_iommu *iommu;
@@ -303,14 +304,15 @@ int modify_irte(int irq, struct irte *irte_modified)
        set_64bit((unsigned long *)irte, irte_modified->low | (1 << 1));
        __iommu_flush_cache(iommu, irte, sizeof(*irte));
 
-       qi_flush_iec(iommu, index, 0);
-
+       rc = qi_flush_iec(iommu, index, 0);
        spin_unlock(&irq_2_ir_lock);
-       return 0;
+
+       return rc;
 }
 
 int flush_irte(int irq)
 {
+       int rc;
        int index;
        struct intel_iommu *iommu;
        struct irq_2_iommu *irq_iommu;
@@ -326,10 +328,10 @@ int flush_irte(int irq)
 
        index = irq_iommu->irte_index + irq_iommu->sub_handle;
 
-       qi_flush_iec(iommu, index, irq_iommu->irte_mask);
+       rc = qi_flush_iec(iommu, index, irq_iommu->irte_mask);
        spin_unlock(&irq_2_ir_lock);
 
-       return 0;
+       return rc;
 }
 
 struct intel_iommu *map_ioapic_to_ir(int apic)
@@ -355,6 +357,7 @@ struct intel_iommu *map_dev_to_ir(struct pci_dev *dev)
 
 int free_irte(int irq)
 {
+       int rc = 0;
        int index, i;
        struct irte *irte;
        struct intel_iommu *iommu;
@@ -375,7 +378,7 @@ int free_irte(int irq)
        if (!irq_iommu->sub_handle) {
                for (i = 0; i < (1 << irq_iommu->irte_mask); i++)
                        set_64bit((unsigned long *)irte, 0);
-               qi_flush_iec(iommu, index, irq_iommu->irte_mask);
+               rc = qi_flush_iec(iommu, index, irq_iommu->irte_mask);
        }
 
        irq_iommu->iommu = NULL;
@@ -385,7 +388,7 @@ int free_irte(int irq)
 
        spin_unlock(&irq_2_ir_lock);
 
-       return 0;
+       return rc;
 }
 
 static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode)