[PATCH v2] Setup disabled bridges even if buses are added.

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This patch setups disabled bridges even if buses have already been
added.

pci_assign_unassigned_resources is called after buses are added.
pci_assign_unassigned_resources calls pci_bus_assign_resources.
pci_bus_assign_resources calls pci_setup_bridge to configure BARs of
bridges.

Currently pci_setup_bridge returns immediately if the bus have already
been added. So pci_assign_unassigned_resources can't configure BARs of
bridge.

The patch fixes the issue.

On logical hot-add, we need to prevent the kernel from re-initializing
bridges that have already been initialized. To achieve this,
pci_setup_bridge returns immediately if the bridge have already been
enabled.

We don't need to check whether the specified bus is a root bus or not.
pci_setup_bridge is not called on a root bus, because a root bus does
not have a bridge.

Thanks,
--
Yuji Shimada


Signed-off-by: Yuji Shimada <shimada-yxb@xxxxxxxxxxxxxxx>

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 334285a..bfc3b5e 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -144,7 +144,7 @@ static void pci_setup_bridge(struct pci_bus *bus)
 	struct pci_bus_region region;
 	u32 l, bu, lu, io_upper16;
 
-	if (!pci_is_root_bus(bus) && bus->is_added)
+	if (atomic_read(&bridge->enable_cnt) != 0)
 		return;
 
 	dev_info(&bridge->dev, "PCI bridge, secondary bus %04x:%02x\n",

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