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

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Message-ID: <20111115005951.GB26360@kroah.com>
Date:	Mon, 14 Nov 2011 16:59:51 -0800
From:	Greg KH <greg@...ah.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Peter Chen <peter.chen@...escale.com>, gregkh@...e.de,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	stern@...land.harvard.edu, hzpeterchen@...il.com
Subject: Re: [PATCH 1/1] driver core: disable device's runtime pm during
 shutdown

On Mon, Nov 14, 2011 at 11:27:37PM +0100, Rafael J. Wysocki wrote:
> On Monday, November 14, 2011, Peter Chen wrote:
> > There may be an issue when the user issue "reboot/shutdown" command, then
> > the device has shut down its hardware, after that, this runtime-pm featured
> > device's driver will probably be scheduled to do its suspend routine,
> > and at its suspend routine, it may access hardware, but the device has
> > already shutdown physically, then the system hang may be occurred.
> > 
> > I ran out this issue using an auto-suspend supported USB devices, like
> > 3G modem, keyboard. The usb runtime suspend routine may be scheduled
> > after the usb controller has been shut down, and the usb runtime suspend
> > routine will try to suspend its roothub(controller), it will access
> > register, then the system hang occurs as the controller is shutdown.
> > Signed-off-by: Peter Chen <peter.chen@...escale.com>
> 
> Greg, do you want me to take this one?

Please do:
	Acked-by: Greg Kroah-Hartman <gregkh@...e.de>

thanks,

greg k-h
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