iommu/vt-d: fix bug in matching PCI devices with DRHD/RMRR descriptors

Commit "59ce0515cdaf iommu/vt-d: Update DRHD/RMRR/ATSR device scope
caches when PCI hotplug happens" introduces a bug, which fails to
match PCI devices with DMAR device scope entries if PCI path array
in the entry has more than one level.

For example, it fails to handle
[1D2h 0466   1]      Device Scope Entry Type : 01
[1D3h 0467   1]                 Entry Length : 0A
[1D4h 0468   2]                     Reserved : 0000
[1D6h 0470   1]               Enumeration ID : 00
[1D7h 0471   1]               PCI Bus Number : 00
[1D8h 0472   2]                     PCI Path : 1C,04
[1DAh 0474   2]                     PCI Path : 00,02

And cause DMA failure on HP DL980 as:
DMAR:[fault reason 02] Present bit in context entry is clear
dmar: DRHD: handling fault status reg 602
dmar: DMAR:[DMA Read] Request device [02:00.2] fault addr 7f61e000

Reported-and-tested-by: Davidlohr Bueso <davidlohr@hp.com>
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index f445c10df8df..39f8b717fe84 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -152,7 +152,8 @@ dmar_alloc_pci_notify_info(struct pci_dev *dev, unsigned long event)
         info->seg = pci_domain_nr(dev->bus);
         info->level = level;
         if (event == BUS_NOTIFY_ADD_DEVICE) {
-                for (tmp = dev, level--; tmp; tmp = tmp->bus->self) {
+                for (tmp = dev; tmp; tmp = tmp->bus->self) {
+                        level--;
                         info->path[level].device = PCI_SLOT(tmp->devfn);
                         info->path[level].function = PCI_FUNC(tmp->devfn);
                         if (pci_is_root_bus(tmp->bus))