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    Subjectwacom + runtime PM = AA deadlock
    Hi,

    by mistake when runtime PM is enabled by default for input devices, X
    hangs on wacom open:
    [<ffffffff814a00ea>] mutex_lock+0x1a/0x40
    [<ffffffffa02bc94b>] wacom_resume+0x3b/0x90 [wacom]
    [<ffffffff81327a32>] usb_resume_interface+0xd2/0x190
    [<ffffffff81327b5d>] usb_resume_both+0x6d/0x110
    [<ffffffff81327c24>] usb_runtime_resume+0x24/0x40
    [<ffffffff8130a2cf>] __pm_runtime_resume+0x26f/0x450
    [<ffffffff8130a23a>] __pm_runtime_resume+0x1da/0x450
    [<ffffffff8130a53a>] pm_runtime_resume+0x2a/0x50
    [<ffffffff81328176>] usb_autopm_get_interface+0x26/0x60
    [<ffffffffa02bc626>] wacom_open+0x36/0x90 [wacom]

    wacom_open took wacom->lock and calls usb_autopm_get_interface which in
    turn calls wacom_resume which tries to aquire the lock again.

    More details (dmesg including) at:
    https://bugzilla.novell.com/show_bug.cgi?id=638506

    Any ideas how to fix that properly?

    thanks,
    --
    js
    suse labs


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