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[2/8] PCI: Clarify the "scan anyway" comment in pci_scan_bridge.

Message ID 1390510768-5652-3-git-send-email-andreas.noever@gmail.com
State Accepted
Headers show

Commit Message

Andreas Noever Jan. 23, 2014, 8:59 p.m. UTC 
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>
---
 drivers/pci/probe.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)
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Patch

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 78caade..cf05b3e 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) {