On Mon, Apr 25, 2016 at 11:53 AM, Mika Westerberg
<mika.westerberg@xxxxxxxxxxxxxxx> wrote:
> 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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