Commit 16468c78 authored Jun 02, 2016 by Mika Westerberg Committed by Bjorn Helgaas Jun 13, 2016

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 <mika.westerberg@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent d963f651

drivers/pci/hotplug/acpiphp_glue.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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);
		}

		/*