linux-kernel - Re: [PATCH] drivers/power/wakeirq: Call device_init_wakeup from dev_pm_set_wake

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Date:	Mon, 14 Sep 2015 14:43:29 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>
Cc:	Sudeep Holla <sudeep.holla@....com>,
	"zhaoyang.huang@...aro.org" <zhaoyang.huang@...aro.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"open list:SUSPEND TO RAM" <linux-pm@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	"tony@...mide.com" <tony@...mide.com>
Subject: Re: [PATCH] drivers/power/wakeirq: Call device_init_wakeup from
 dev_pm_set_wake_irq

(+Tony in case he has any inputs)

Hi Daniel,

On 01/09/15 15:53, Daniel Lezcano wrote:
> The function dev_pm_set_wake_irq is typically called after device_init_wakeup.
>
> Instead of summing a couple of call, let's call device_init_wakeup directly
> from dev_pm_set_wake_irq / dev_pm_clear_wake_irq.
>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>   drivers/base/power/wakeirq.c | 10 +++++++---
>   1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/base/power/wakeirq.c b/drivers/base/power/wakeirq.c
> index eb6e674..287a021 100644
> --- a/drivers/base/power/wakeirq.c
> +++ b/drivers/base/power/wakeirq.c
> @@ -60,8 +60,7 @@ static int dev_pm_attach_wake_irq(struct device *dev, int irq,
>    *
>    * Attach a device IO interrupt as a wake IRQ. The wake IRQ gets
>    * automatically configured for wake-up from suspend  based
> - * on the device specific sysfs wakeup entry. Typically called
> - * during driver probe after calling device_init_wakeup().
> + * on the device specific sysfs wakeup entry.
>    */
>   int dev_pm_set_wake_irq(struct device *dev, int irq)
>   {
> @@ -75,9 +74,13 @@ int dev_pm_set_wake_irq(struct device *dev, int irq)
>   	wirq->dev = dev;
>   	wirq->irq = irq;
>
> +	device_init_wakeup(dev, true);
> +

IMO we can move this to dev_pm_attach_wake_irq, so that both
dev_pm_set_dedicated_wake_irq and dev_pm_set_wake_irq are handled at one
place.

Also the first user(drivers/i2c/i2c-core.c) of the API is added in
v4.3-rc1. So you need to fix that as Rafael pointed out initially.

Regards,
Sudeep
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