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SubjectRe: [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 <>
> Greg, do you want me to take this one?

Please do:
Acked-by: Greg Kroah-Hartman <>


greg k-h

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