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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 <mika.westerberg@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mika Westerberg 2016-06-02 11:17:14 +03:00 committed by Bjorn Helgaas
parent d963f6512e
commit 16468c783c
1 changed files with 4 additions and 0 deletions
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4
drivers/pci/hotplug/acpiphp_glue.c
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@ -675,6 +675,8 @@ static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
if (bridge->is_going_away) if (bridge->is_going_away)
return; return;
pm_runtime_get_sync(&bridge->pci_dev->dev);
list_for_each_entry(slot, &bridge->slots, node) { list_for_each_entry(slot, &bridge->slots, node) {
struct pci_bus *bus = slot->bus; struct pci_bus *bus = slot->bus;
struct pci_dev *dev, *tmp; struct pci_dev *dev, *tmp;
@ -694,6 +696,8 @@ static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
disable_slot(slot); disable_slot(slot);
} }
} }
pm_runtime_put(&bridge->pci_dev->dev);
} }
/* /*