On Mon, Mar 11, 2019 at 04:31:08PM +0300, Sergey Miroshnichenko wrote:
> Use the PM runtime methods to wake up the bridges before accessing
> their config space.
>
> Signed-off-by: Sergey Miroshnichenko <s.miroshnichenko@xxxxxxxxx>
> ---
> drivers/pci/probe.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 88350dd56344..dc935f82a595 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -3252,6 +3252,8 @@ static void pci_bus_rescan_prepare(struct pci_bus *bus)
> {
> struct pci_dev *dev;
>
> + pm_runtime_get_sync(&bus->dev);
This should be part of the patch that adds the config space access
so we can tell specifically what code requires the wakeup.
> list_for_each_entry(dev, &bus->devices, bus_list) {
> struct pci_bus *child = dev->subordinate;
>
> @@ -3278,6 +3280,8 @@ static void pci_bus_rescan_done(struct pci_bus *bus)
> dev->driver->rescan_done(dev);
> }
> }
> +
> + pm_runtime_put(&bus->dev);
> }
>
> /**
> --
> 2.20.1
>
