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

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Message-Id: <201205031528.12743.rjw@sisk.pl>
Date:	Thu, 3 May 2012 15:28:12 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Arve Hjønnevåg <arve@...roid.com>
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 Thursday, May 03, 2012, Arve Hjønnevåg wrote:
> 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.

My bad, sorry about that.

> ...
> > +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;


Yes, I did.

I'll add the following as an incremental patch on top of the series.

Thanks,
Rafael

---
 kernel/power/main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/kernel/power/main.c
===================================================================
--- linux.orig/kernel/power/main.c
+++ linux/kernel/power/main.c
@@ -422,7 +422,7 @@ static ssize_t autosleep_store(struct ko
 	int error;
 
 	if (state == PM_SUSPEND_ON
-	    && !(strncmp(buf, "off", 3) && strncmp(buf, "off\n", 4)))
+	    && strncmp(buf, "off", 3) && strncmp(buf, "off\n", 4))
 		return -EINVAL;
 
 	error = pm_autosleep_set_state(state);
--
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