ACPI / hotplug / PCI: Runtime resume bridge before rescan

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]>
lucamilanesio · Jun 13, 2016 · 16468c7 · 16468c7
1 parent d963f65
commit 16468c7
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
@@ -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);
 }
 
 /*