linux-kernel - RE: [PATCH 1/1] driver core: disable device's runtime pm during shutdown

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Date:	Mon, 5 Dec 2011 05:53:27 +0000
From:	Chen Peter-B29397 <B29397@...escale.com>
To:	NeilBrown <neilb@...e.de>, Ming Lei <tom.leiming@...il.com>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>, Greg KH <greg@...ah.com>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"stern@...land.harvard.edu" <stern@...land.harvard.edu>,
	"hzpeterchen@...il.com" <hzpeterchen@...il.com>,
	Igor Grinberg <grinberg@...pulab.co.il>
Subject: RE: [PATCH 1/1] driver core: disable device's runtime pm during
 shutdown


 
> > > So it is asleep when the new pm_runtime_disable() call is made, so it
> stays
> > > asleep, omap_i2c_xfer cannot wake it, the transfer doesn't happen and
> the
> > > system doesn't get powered off.
> > >
> > > So here is a device that should *not* have pm disabled at shutdown.
> > >
> > > So I feel this fix is a little too heavy-handed.
> >
> > Maybe the device's runtime PM should not be disabled if
> > there is no ->shutdown defined in its driver, how about the blew?
> 
> Thanks, but that won't actually help.
> 
> dev->bus->shutdown is i2c_device_shutdown so there is a shutdown method.
> However i2c_device_shutdown just finds the driver can calls
> driver->shutdown(), and that is the 'shutdown' that is NULL.
> 
Then, i2c should be registered before than twl4030 as a platform device, since
twl4030 is an i2c device. Just let i2c shut down later than twl4030's. 

> Thanks,
> NeilBrown
> 
> 
> 

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