linux-kernel - Re: [RFC][PATCH 6/8] PM / Sleep: Implement opportunistic sleep

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Date:	Wed, 2 May 2012 17:23:18 -0700
From:	Arve Hjønnevåg <arve@...roid.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	NeilBrown <neilb@...e.de>,
	Linux PM list <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Magnus Damm <magnus.damm@...il.com>, markgross@...gnar.org,
	Matthew Garrett <mjg@...hat.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	John Stultz <john.stultz@...aro.org>,
	Brian Swetland <swetland@...gle.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH 6/8] PM / Sleep: Implement opportunistic sleep

On Thu, Apr 26, 2012 at 2:52 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
...
> From: Rafael J. Wysocki <rjw@...k.pl>
> Subject: PM / Sleep: Implement opportunistic sleep, v2
>
> Introduce a mechanism by which the kernel can trigger global
> transitions to a sleep state chosen by user space if there are no
> active wakeup sources.
>
> It consists of a new sysfs attribute, /sys/power/autosleep, that
> can be written one of the strings returned by reads from
> /sys/power/state, an ordered workqueue and a work item carrying out
> the "suspend" operations.  If a string representing the system's
> sleep state is written to /sys/power/autosleep, the work item
> triggering transitions to that state is queued up and it requeues
> itself after every execution until user space writes "off" to
> /sys/power/autosleep.
>

This does not work. Writing something other than "off" disabled auto
suspend for me.

...
> +static ssize_t autosleep_store(struct kobject *kobj,
> +                              struct kobj_attribute *attr,
> +                              const char *buf, size_t n)
> +{
> +       suspend_state_t state = decode_state(buf, n);
> +       int error;
> +
> +       if (state == PM_SUSPEND_ON
> +           && !(strncmp(buf, "off", 3) && strncmp(buf, "off\n", 4)))
> +               return -EINVAL;

Did you mean:
	if (state == PM_SUSPEND_ON
	    && strcmp(buf, "off") && strcmp(buf, "off\n"))
		return -EINVAL;

-- 
Arve Hjønnevåg
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