PCI: Clarify the "scan anyway" comment in pci_scan_bridge()

Initially when we encountered a bus that was already present we skipped
it. Since 74710ded8e16 'PCI: always scan child buses' we continue
scanning in order to allow user triggered rescans of already existing
busses.

The old comment suggested that the reason for continuing the scan is a
bug in the i450NX chipset. This is not the case.

Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index f340c947d8cb..511a8f6d7636 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -805,11 +805,10 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
                         goto out;
 
                 /*
-                 * If we already got to this bus through a different bridge,
-                 * don't re-add it. This can happen with the i450NX chipset.
-                 *
-                 * However, we continue to descend down the hierarchy and
-                 * scan remaining child buses.
+                 * The bus might already exist for two reasons: Either we are
+                 * rescanning the bus or the bus is reachable through more than
+                 * one bridge. The second case can happen with the i450NX
+                 * chipset.
                  */
                 child = pci_find_bus(pci_domain_nr(bus), secondary);
                 if (!child) {