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PCI: Increment max correctly in pci_scan_bridge() 

This patch fixes two small issues:
 - If pci_add_new_bus() fails, max must not be incremented. Otherwise
   an incorrect value is returned from pci_scan_bridge().
 - If the bus is already present, max must be incremented. I think
   that this case should only be hit if we trigger a manual rescan of a
   CardBus bridge.

Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Andreas Noever 2014-01-23 21:59:21 +01:00 committed by Bjorn Helgaas
parent 38dbfb59d1
commit 9a4d7d8719
1 changed files with 3 additions and 2 deletions
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5
drivers/pci/probe.c
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@ -852,11 +852,12 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
* this case we only re-scan this bus. */
child = pci_find_bus(pci_domain_nr(bus), max+1);
if (!child) {
child = pci_add_new_bus(bus, dev, ++max);
child = pci_add_new_bus(bus, dev, max+1);
if (!child)
goto out;
pci_bus_insert_busn_res(child, max, 0xff);
pci_bus_insert_busn_res(child, max+1, 0xff);
}
max++;
buses = (buses & 0xff000000)
| ((unsigned int)(child->primary) << 0)
| ((unsigned int)(child->busn_res.start) << 8)