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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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