PCI: enumerate the PCI device only removed out PCI hieratchy of OS when re-scanning PCI
When hot-plugging a root bridge, we always prevent assigning a bus number
that already exists. This makes sure we don't step over an existing bus.
But sometimes we only remove PCI device in PCI hieratchy of OS, i,e.
echo 1 > /sys/bus/pci/devices/.../remove
but actually don't hotplug this device out the platform, so in this case
we still should re-scan this bus to enumerate this device when re-scanning
PCI again.
Signed-off-by: Tiejun Chen <tiejun.chen@windriver.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index bafb3c3..f03ed96 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -724,12 +724,14 @@
pci_write_config_word(dev, PCI_STATUS, 0xffff);
/* Prevent assigning a bus number that already exists.
- * This can happen when a bridge is hot-plugged */
- if (pci_find_bus(pci_domain_nr(bus), max+1))
- goto out;
- child = pci_add_new_bus(bus, dev, ++max);
- if (!child)
- goto out;
+ * This can happen when a bridge is hot-plugged, so in
+ * 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);
+ if (!child)
+ goto out;
+ }
buses = (buses & 0xff000000)
| ((unsigned int)(child->primary) << 0)
| ((unsigned int)(child->secondary) << 8)