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PCI: Make rescan bus increase bridge resource size if needed

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Current rescan will not touch bridge MMIO and IO.

Try to reuse pci_assign_unassigned_bridge_resources(bridge) to update bridge
resources, if child devices need more resources.

Only do that for bridges whose children are all removed already; i.e. don't
release resources that could already be in use by drivers on child devices.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Yinghai Lu 2012-01-21 02:08:22 -08:00 • committed by Jesse Barnes
parent 8424d7592e
commit 2f320521a0
3 changed files with 30 additions and 1 deletions
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5
drivers/pci/pci-sysfs.c
View file

@ -366,7 +366,10 @@ dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
if (val) {
mutex_lock(&pci_remove_rescan_mutex);
pci_rescan_bus(bus);
if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
pci_rescan_bus_bridge_resize(bus->self);
else
pci_rescan_bus(bus);
mutex_unlock(&pci_remove_rescan_mutex);
}
return count;