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    SubjectRe: [linux-usb-devel] 2.6.18-rc6-mm1 (-mm2): ohci resume problem
    Date
    On Thursday, 14 September 2006 21:37, Rafael J. Wysocki wrote:
    > On Thursday, 14 September 2006 20:28, Alan Stern wrote:
    > > On Thu, 14 Sep 2006, Rafael J. Wysocki wrote:
    > >
    > > > > Let's try a simpler test. Leave USB_SUSPEND unset.
    > > > >
    > > > > First rmmod ohci-hcd. None of your full-speed USB devices will work, but
    > > > > that's okay. Try the suspend-twice test and see what happens.
    > > > >
    > > > > Second, rmmod ehci-hcd and modprobe ohci-hcd. Again try the suspend-twice
    > > > > test.
    > > >
    > > > Done, works (with USB_SUSPEND unset).
    > >
    > > Okay, good.
    >
    > Well, sorry. This test has been passed, but after a reboot it refused to
    > suspend just once giving the same messages that I've got from the kernel
    > with USB_SUSPEND set (the relevant dmesg output is attached).

    This only happens if _both_ ohci_hcd and ehci_hcd are loaded before the
    suspend.

    > > Then for the next stage, repeat the same tests but with
    > > USB_SUSPEND set.
    >
    > Compiling.

    The results are now the same with and without USB_SUSPEND set. Namely,
    if one hcd is loaded before a suspend (either ehci or ohci), it succeeds
    (repeatable arbitrary number of times in a row). However, if both hcds are
    loaded before a suspend, it fails (100% of the time) and the messages are
    like in the dmesg output attached to the previous message.

    I've reproduced this behavior on another x86_64 box.

    Greetings,
    Rafael


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