[PATCH pciutils 3/5] libpci: generic: Implement SUBSYS also for PCI_HEADER_TYPE_BRIDGE

["Pali Rohár" <pali@kernel.org>]

Subsystem ids for PCI Bridges are stored in extended capability
PCI_CAP_ID_SSVID.
---
 lib/generic.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/lib/generic.c b/lib/generic.c
index f4b6918cb55b..2cdb7956754c 100644
--- a/lib/generic.c
+++ b/lib/generic.c
@@ -117,6 +117,30 @@ pci_generic_fill_info(struct pci_dev *d, unsigned int flags)
           d->subsys_id = pci_read_word(d, PCI_SUBSYSTEM_ID);
           done |= PCI_FILL_SUBSYS;
           break;
+        case PCI_HEADER_TYPE_BRIDGE:
+          if (pci_read_word(d, PCI_STATUS) & PCI_STATUS_CAP_LIST)
+            {
+              byte been_there[256];
+              int where, id;
+
+              memset(been_there, 0, 256);
+              where = pci_read_byte(d, PCI_CAPABILITY_LIST) & ~3;
+              while (where && !been_there[where]++)
+                {
+                  id = pci_read_byte(d, where + PCI_CAP_LIST_ID);
+                  if (id == PCI_CAP_ID_SSVID)
+                    {
+                      d->subsys_vendor_id = pci_read_word(d, where + PCI_SSVID_VENDOR);
+                      d->subsys_id = pci_read_word(d, where + PCI_SSVID_DEVICE);
+                      done |= PCI_FILL_SUBSYS;
+                      break;
+                    }
+                  if (id == 0xff)
+                    break;
+                  where = pci_read_byte(d, where + PCI_CAP_LIST_NEXT) & ~3;
+                }
+            }
+          break;
         case PCI_HEADER_TYPE_CARDBUS:
           d->subsys_vendor_id = pci_read_word(d, PCI_CB_SUBSYSTEM_VENDOR_ID);
           d->subsys_id = pci_read_word(d, PCI_CB_SUBSYSTEM_ID);
-- 
2.20.1