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PCI hotplug: make sure child bridges are enabled at hotplug time 

Found one PCIe Module with several bridges built-in where a "cold"
hotadd doesn't work.

If we end up reassigning bridge windows at hotadd time, and have to loop
through assigning new ranges, we won't end up enabling the child bridges
because the first assignment pass already tried to enable them, which
prevents __pci_bridge_assign_resource from updating the windows.

So try to move enabling of child bridges to the end, and only do it
once.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Yinghai Lu 2010-05-21 14:35:06 -07:00 committed by Jesse Barnes
parent 0ba10bc752
commit 3f579c340f
1 changed files with 7 additions and 5 deletions
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12
drivers/pci/setup-bus.c
View File

@ -874,19 +874,16 @@ void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
again:
pci_bus_size_bridges(parent);
__pci_bridge_assign_resources(bridge, &head);
retval = pci_reenable_device(bridge);
pci_set_master(bridge);
pci_enable_bridges(parent);
tried_times++;
if (!head.next)
return;
goto enable_all;
if (tried_times >= 2) {
/* still fail, don't need to try more */
free_failed_list(&head);
return;
goto enable_all;
}
printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n",
@ -919,5 +916,10 @@ again:
free_failed_list(&head);
goto again;
enable_all:
retval = pci_reenable_device(bridge);
pci_set_master(bridge);
pci_enable_bridges(parent);
}
EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);