OHCI: Allow broken controllers to auto-stop

[Leann Ogasawara]

SRU Justification: This patch has been accepted into the upstream 2.6.27.3 stable kernel.
It should be pulled into the Ubuntu kernel as well.

TEST CASE: TBD

commit 5bad3352aa6262a0e4515315060d93d691913399
Author: Alan Stern <email address hidden>
Date: Fri Oct 17 23:10:23 2008 +0000

    OHCI: Allow broken controllers to auto-stop

    commit 4a511bc3f5829bc18428bcf11c25417a79d09396 upstream

    This patch (as1134) attempts to improve the way we handle OHCI
    controllers with broken Root Hub Status Change interrupt support. In
    these controllers the RHSC interrupt bit essentially never turns off,
    making RHSC interrupts useless -- they have to remain permanently
    disabled.

    Such controllers should still be allowed to turn off their root hubs
    when no devices are attached. Polling for new connections can
    continue while the root hub is suspended. The patch implements this
    feature. (It won't have much effect unless CONFIG_PM is enabled and
    CONFIG_USB_SUSPEND is disabled, but since the overhead is very small
    we may as well do it.)

    Signed-off-by: Alan Stern <email address hidden>
    Signed-off-by: Greg Kroah-Hartman <email address hidden>

[Leann Ogasawara (leannogasawara)]

This bug has been reopened as Bug 294152.