Re: [PATCH] PM / PCI: Do not resume any devices in pci_pm_prepare()

[Bjorn Helgaas]

On Mon, Sep 25, 2017 at 01:33:13AM +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> 
> It should not be necessary to resume devices with ignore_children set
> in pci_pm_prepare(), because they should be resumed explcitly by
> their children drivers during suspend if need be and they will be
> resumed by pci_pm_suspend() after that anyway, so avoid doing that.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>

Oh, and I meant to also say that you've merged the PM-related things
here in the past, so I assume you'll take this one :)

> ---
>  drivers/pci/pci-driver.c |    7 -------
>  1 file changed, 7 deletions(-)
> 
> Index: linux-pm/drivers/pci/pci-driver.c
> ===================================================================
> --- linux-pm.orig/drivers/pci/pci-driver.c
> +++ linux-pm/drivers/pci/pci-driver.c
> @@ -680,13 +680,6 @@ static int pci_pm_prepare(struct device
>  {
>  	struct device_driver *drv = dev->driver;
>  
> -	/*
> -	 * Devices having power.ignore_children set may still be necessary for
> -	 * suspending their children in the next phase of device suspend.
> -	 */
> -	if (dev->power.ignore_children)
> -		pm_runtime_resume(dev);
> -
>  	if (drv && drv->pm && drv->pm->prepare) {
>  		int error = drv->pm->prepare(dev);
>  		if (error)
>