linux-kernel - Re: [PATCH] PM / PCI: Do not resume any devices in pci_pm

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Date:   Tue, 26 Sep 2017 16:34:55 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux PCI <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Linux PM <linux-pm@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PM / PCI: Do not resume any devices in pci_pm_prepare()

On Mon, Sep 25, 2017 at 01:33:13AM +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> It should not be necessary to resume devices with ignore_children set
> in pci_pm_prepare(), because they should be resumed explcitly by

s/explcitly/explicitly/

> 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@...el.com>

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

I think your previous patches to this file mostly used a "PCI / PM"
subject line prefix (as opposed to the "PM / PCI" here).  But maybe
the difference means something?

> ---
>  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)
>