iommu/vt-d: fix bug in handling multiple RMRRs for the same PCI device

Function dmar_iommu_notify_scope_dev() makes a wrong assumption that
there's one RMRR for each PCI device at most, which causes DMA failure
on some HP platforms. So enhance dmar_iommu_notify_scope_dev() to
handle multiple RMRRs for the same PCI device.

Fixbug: https://bugzilla.novell.com/show_bug.cgi?id=879482

Cc: <stable@vger.kernel.org> # 3.15
Reported-by: Tom Mingarelli <thomas.mingarelli@hp.com>
Tested-by: Linda Knippers <linda.knippers@hp.com>
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 6bb32773c3ac3471ab7bf439d9191be757bacb5c..51b6b77dc3e58ce7b86d123948dff9de808106f9 100644 (file)
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3816,14 +3816,11 @@ int dmar_iommu_notify_scope_dev(struct dmar_pci_notify_info *info)
                                ((void *)rmrr) + rmrr->header.length,
                                rmrr->segment, rmrru->devices,
                                rmrru->devices_cnt);
-                       if (ret > 0)
-                               break;
-                       else if(ret < 0)
+                       if(ret < 0)
                                return ret;
                } else if (info->event == BUS_NOTIFY_DEL_DEVICE) {
-                       if (dmar_remove_dev_scope(info, rmrr->segment,
-                               rmrru->devices, rmrru->devices_cnt))
-                               break;
+                       dmar_remove_dev_scope(info, rmrr->segment,
+                               rmrru->devices, rmrru->devices_cnt);
                }
        }