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    SubjectRe: [PATCH 1/1] driver core: disable device's runtime pm during shutdown
    Date
    On Tuesday, November 15, 2011, Greg KH wrote:
    > 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@freescale.com>
    > >
    > > Greg, do you want me to take this one?
    >
    > Please do:
    > Acked-by: Greg Kroah-Hartman <gregkh@suse.de>

    Done, thanks!

    Rafael


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