[linux-yocto] [PATCH 6/7] ACPI / hotplug / PCI: Runtime resume bridge before rescan
Yong, Jonathan
jonathan.yong at intel.com
Wed Jun 29 18:03:22 PDT 2016
From: Mika Westerberg <mika.westerberg at linux.intel.com>
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 at linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
Signed-off-by: Yong, Jonathan <jonathan.yong at intel.com>
---
drivers/pci/hotplug/acpiphp_glue.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index b60309e..d49f481 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -676,6 +676,8 @@ 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;
@@ -695,6 +697,8 @@ static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
disable_slot(slot);
}
}
+
+ pm_runtime_put(&bridge->pci_dev->dev);
}
/*
--
2.7.3
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