linux-kernel - Re: Problems with remote-wakeup settings

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Message-Id: <201003062225.09514.rjw@sisk.pl>
Date:	Sat, 6 Mar 2010 22:25:09 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	"Linux-pm mailing list" <linux-pm@...ts.linux-foundation.org>,
	linux-input@...r.kernel.org, linux-hotplug@...r.kernel.org,
	USB list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	NetDev <netdev@...r.kernel.org>
Subject: Re: Problems with remote-wakeup settings

On Saturday 06 March 2010, Alan Stern wrote:
> On Sat, 6 Mar 2010, Rafael J. Wysocki wrote:
> 
> > > It's not difficult in theory to tie together the WoL setting and the
> > > wakeup flag:
> > > 
> > > 	If ethtool changes the WoL setting, the driver's ioctl handler
> > > 	should make the corresponding change to the wakeup flag.
> > > 
> > > 	If ethtool queries the WoL setting, the ioctl handler should
> > > 	check the wakeup flag.  If the flag is off, it should report 
> > > 	that WoL is disabled; if the flag is on, it should report that 
> > > 	WoL is enabled.  (The same check should be made in the suspend
> > > 	routine.)
> > 
> > That's done this way already in all drivers I know, but we need a hook
> > from wake_store() back to the driver.
> 
> What for?  wake_store() can't be called during a sleep transition
> (because tasks are frozen) or while the system is asleep.  And if it is
> called at any other time, the driver doesn't need to know until either
> its ioctl handler or its suspend method runs.

Right.

That means, though, that the network adapter drivers' "get WoL" routines
should check should_wakeup too.  They don't do that right now, but IMO it's
reasonable to request that they be modified.

Adding netdev to the Cc list.

Rafael
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