[PATCH v5 06/13] PCI: do not enable bridges more than once

[Alex Chiang]

In preparation for PCI core hotplug, we need to ensure that we do
not attempt to re-enable bridges that have already been enabled.

Reported-by: Kenji Kaneshige <kaneshige.kenji@xxxxxxxxxxxxxx>
Signed-off-by: Alex Chiang <achiang@xxxxxx>
---

 drivers/pci/bus.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 118c777..68f91a2 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -184,8 +184,10 @@ void pci_enable_bridges(struct pci_bus *bus)
 
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		if (dev->subordinate) {
-			retval = pci_enable_device(dev);
-			pci_set_master(dev);
+			if (atomic_read(&dev->enable_cnt) == 0) {
+				retval = pci_enable_device(dev);
+				pci_set_master(dev);
+			}
 			pci_enable_bridges(dev->subordinate);
 		}
 	}

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