PCI: populate subsystem vendor and device IDs for PCI bridges

Change to populate the subsystem vendor and subsytem device IDs for
PCI-PCI bridges that implement the PCI Subsystem Vendor ID capability.
Previously bridges left subsystem vendor IDs unpopulated.

Signed-off-by: Gabe Black <gabe.black@ni.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

2 files changed, 11 insertions, 0 deletions

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 118463befef0..4842b09b7f3c 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -730,6 +730,7 @@ int pci_setup_device(struct pci_dev *dev)
         u32 class;
         u8 hdr_type;
         struct pci_slot *slot;
+        int pos = 0;
 
         if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
                 return -EIO;
@@ -822,6 +823,11 @@ int pci_setup_device(struct pci_dev *dev)
                 dev->transparent = ((dev->class & 0xff) == 1);
                 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
                 set_pcie_hotplug_bridge(dev);
+                pos = pci_find_capability(dev, PCI_CAP_ID_SSVID);
+                if (pos) {
+                        pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor);
+                        pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device);
+                }
                 break;
 
         case PCI_HEADER_TYPE_CARDBUS:               /* CardBus bridge header */
diff --git a/include/linux/pci_regs.h b/include/linux/pci_regs.h
index d798770f08cd..9f2ad0aa3c39 100644
--- a/include/linux/pci_regs.h
+++ b/include/linux/pci_regs.h
@@ -365,6 +365,11 @@
 #define  PCI_X_STATUS_266MHZ    0x40000000      /* 266 MHz capable */
 #define  PCI_X_STATUS_533MHZ    0x80000000      /* 533 MHz capable */
 
+/* PCI Bridge Subsystem ID registers */
+
+#define PCI_SSVID_VENDOR_ID     4       /* PCI-Bridge subsystem vendor id register */
+#define PCI_SSVID_DEVICE_ID     6       /* PCI-Bridge subsystem device id register */
+
 /* PCI Express capability registers */
 
 #define PCI_EXP_FLAGS           2       /* Capabilities register */