linux-kernel - Re: [PATCH 1/3] usb: musb: fix pm

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Message-ID: <Pine.LNX.4.44L0.1112152228030.22491-100000@netrider.rowland.org>
Date:	Thu, 15 Dec 2011 22:30:55 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Felipe Contreras <felipe.contreras@...il.com>
cc:	linux-usb@...r.kernel.org, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Jiri Kosina <trivial@...nel.org>
Subject: Re: [PATCH 1/3] usb: musb: fix pm_runtime mismatches

On Fri, 16 Dec 2011, Felipe Contreras wrote:

> >> --- a/drivers/usb/musb/omap2430.c
> >> +++ b/drivers/usb/musb/omap2430.c
> >> @@ -385,6 +385,7 @@ static void omap2430_musb_disable(struct musb *musb)
> >>
> >>  static int omap2430_musb_exit(struct musb *musb)
> >>  {
> >> +     pm_runtime_put(musb->controller);
> >>       del_timer_sync(&musb_idle_timer);
> >>
> >>       omap2430_low_level_exit(musb);
> >
> > Should these calls be pm_runtime_put_sync() instead of
> > pm_runtime_put()?
> 
> I don't see why... The thing failed, it's not going to be used any
> more so better let PM deactivate the device.

It's not a big deal.  The difference is that pm_runtime_put_sync()
avoids an extra context switch when suspending the device.  A minor
optimization, that's all.

Alan Stern

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