linux-kernel - Re: [RFC PATCH v11 4/5] PCI / PM: Add support for the PCIe WAKE# signal for OF

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Date:   Wed, 3 Jan 2018 12:08:37 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        JeffyChen <jeffy.chen@...k-chips.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Brian Norris <briannorris@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
Subject: Re: [RFC PATCH v11 4/5] PCI / PM: Add support for the PCIe WAKE#
 signal for OF

Hi,

* Rafael J. Wysocki <rjw@...ysocki.net> [171228 17:33]:
> So we are fine except for the race and we need the wakeirq field in wakeup
> sources to automatically arm the wakeup IRQs during suspend.
> 
> If I'm not mistaken, we only need something like the patch below (untested).

Yeah for your patch below works just fine for my
test cases so:

Tested-by: Tony Lindgren <tony@...mide.com>

> ---
>  drivers/base/power/wakeirq.c |    9 ++++-----
>  drivers/base/power/wakeup.c  |    2 +-
>  2 files changed, 5 insertions(+), 6 deletions(-)
> 
> Index: linux-pm/drivers/base/power/wakeirq.c
> ===================================================================
> --- linux-pm.orig/drivers/base/power/wakeirq.c
> +++ linux-pm/drivers/base/power/wakeirq.c
> @@ -33,7 +33,6 @@ static int dev_pm_attach_wake_irq(struct
>  				  struct wake_irq *wirq)
>  {
>  	unsigned long flags;
> -	int err;
>  
>  	if (!dev || !wirq)
>  		return -EINVAL;
> @@ -45,12 +44,12 @@ static int dev_pm_attach_wake_irq(struct
>  		return -EEXIST;
>  	}
>  
> -	err = device_wakeup_attach_irq(dev, wirq);
> -	if (!err)
> -		dev->power.wakeirq = wirq;
> +	dev->power.wakeirq = wirq;
> +	if (dev->power.wakeup)
> +		device_wakeup_attach_irq(dev, wirq);
>  
>  	spin_unlock_irqrestore(&dev->power.lock, flags);
> -	return err;
> +	return 0;
>  }
>  
>  /**
> Index: linux-pm/drivers/base/power/wakeup.c
> ===================================================================
> --- linux-pm.orig/drivers/base/power/wakeup.c
> +++ linux-pm/drivers/base/power/wakeup.c
> @@ -303,7 +303,7 @@ int device_wakeup_attach_irq(struct devi
>  	}
>  
>  	if (ws->wakeirq)
> -		return -EEXIST;
> +		dev_err(dev, "Leftover wakeup IRQ found, overriding\n");
>  
>  	ws->wakeirq = wakeirq;
>  	return 0;
>