linux-kernel - Re: [PATCH] power: Fix typo in status comparison causing warning

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Date:	Fri, 29 Oct 2010 10:08:54 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Kevin Winchester <kjwinchester@...il.com>,
	Pavel Machek <pavel@....cz>,
	<linux-pm@...ts.linux-foundation.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] power: Fix typo in status comparison causing warning

On Fri, 29 Oct 2010, Rafael J. Wysocki wrote:

> On Friday, October 29, 2010, Kevin Winchester wrote:
> > GCC version 4.5.1 gives the following warning:
> > 
> > 	drivers/base/power/runtime.c: In function ârpm_check_suspend_allowedâ:
> > 	drivers/base/power/runtime.c:146:25: warning: comparison between âenum dpm_stateâ and âenum rpm_statusâ
> > 
> > which seems to be a typo in that dev->power.runtime_status
> > should be compared instead of dev->power.status.
> > 
> > Signed-off-by: Kevin Winchester <kjwinchester@...il.com>
> > ---
> >  drivers/base/power/runtime.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
> > index 126ca49..02c652b 100644
> > --- a/drivers/base/power/runtime.c
> > +++ b/drivers/base/power/runtime.c
> > @@ -143,7 +143,7 @@ static int rpm_check_suspend_allowed(struct device *dev)
> >  
> >  	/* Pending resume requests take precedence over suspends. */
> >  	else if ((dev->power.deferred_resume
> > -			&& dev->power.status == RPM_SUSPENDING)
> > +			&& dev->power.runtime_status == RPM_SUSPENDING)
> >  	    || (dev->power.request_pending
> >  			&& dev->power.request == RPM_REQ_RESUME))
> >  		retval = -EAGAIN;
> 
> Ouch, this actually is a serious bug.

Yes indeed.  I should have caught it while reviewing the patch.  A 
quick check shows there are no other similar typos.

> Thanks a lot for the fix, will push to Linus shortly.
> 
> Rafael

Alan Stern

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