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@xxxxxxxxxxxxxxx>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
---
drivers/pci/hotplug/acpiphp_glue.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index fa49f9143b80..d64ce8aa99b3 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -756,8 +756,10 @@ static void hotplug_event(u32 type, struct acpiphp_context *context)
acpi_lock_hp_context();
bridge = context->bridge;
- if (bridge)
+ if (bridge) {
get_bridge(bridge);
+ pm_runtime_get_sync(&bridge->pci_dev->dev);
+ }
acpi_unlock_hp_context();
@@ -797,8 +799,10 @@ static void hotplug_event(u32 type, struct acpiphp_context *context)
}
pci_unlock_rescan_remove();
- if (bridge)
+ if (bridge) {
+ pm_runtime_put(&bridge->pci_dev->dev);
put_bridge(bridge);
+ }
}
static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type)
--
2.8.0.rc3
--
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