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ACPI / hotplug / PCI: Runtime resume bridge before rescan

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If a PCI bridge (or PCIe port) that is runtime suspended gets an ACPI
hotplug event, such as BUS_CHECK we need to make sure it is resumed before
devices below the bridge are re-scanned. Otherwise the devices behind the
port are not accessible and will be treated as hot-unplugged.

To fix this, resume PCI bridges from runtime suspend while rescanning.

Signed-off-by: Mika Westerberg <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Acked-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Mika Westerberg authored and Bjorn Helgaas committed 2016-06-13 14:58:04 -05:00
1 parent d963f6512e
commit 16468c783c
1 file changed
+4
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drivers/pci/hotplug/acpiphp_glue.c
+4
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@@ -675,6 +675,8 @@ static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
if (bridge->is_going_away)
return;
pm_runtime_get_sync(&bridge->pci_dev->dev);
list_for_each_entry(slot, &bridge->slots, node) {
struct pci_bus *bus = slot->bus;
struct pci_dev *dev, *tmp;
@@ -694,6 +696,8 @@ static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
disable_slot(slot);
}
}
pm_runtime_put(&bridge->pci_dev->dev);
}
/*