iommu/amd: Make sure IOMMU interrupts are re-enabled on resume

BugLink: http://bugs.launchpad.net/bugs/981162

commit 9ddd592a191b32f2ee6c4b6ed2bd52665c3a49f5 upstream

Unfortunatly the interrupts for the event log and the
peripheral page-faults are only enabled at boot but not
re-enabled at resume. Fix that for 3.2.

Cc: stable@vger.kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Leann Ogasawara <leann.ogasawara@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 5c74179..20d5852 100644 (file)
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1033,8 +1033,9 @@ static int iommu_setup_msi(struct amd_iommu *iommu)
 {
        int r;
 
-       if (pci_enable_msi(iommu->dev))
-               return 1;
+       r = pci_enable_msi(iommu->dev);
+       if (r)
+               return r;
 
        r = request_threaded_irq(iommu->dev->irq,
                                 amd_iommu_int_handler,
@@ -1044,24 +1045,33 @@ static int iommu_setup_msi(struct amd_iommu *iommu)
 
        if (r) {
                pci_disable_msi(iommu->dev);
-               return 1;
+               return r;
        }
 
        iommu->int_enabled = true;
-       iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);
 
        return 0;
 }
 
 static int iommu_init_msi(struct amd_iommu *iommu)
 {
+       int ret;
+
        if (iommu->int_enabled)
-               return 0;
+               goto enable_faults;
 
        if (pci_find_capability(iommu->dev, PCI_CAP_ID_MSI))
-               return iommu_setup_msi(iommu);
+               ret = iommu_setup_msi(iommu);
+       else
+               ret = -ENODEV;
 
-       return 1;
+       if (ret)
+               return ret;
+
+enable_faults:
+       iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);
+
+       return 0;
 }
 
 /****************************************************************************