[Bug 216766] USB enumeration lockup

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https://bugzilla.kernel.org/show_bug.cgi?id=216766

--- Comment #6 from Mathias Nyman (mathias.nyman@xxxxxxxxxxxxxxx) ---
But reading usbfs shouldn't block forever either, so there's something else
wrong as well.
Maybe we fails to give back an URB, or retry reading all the disconnected
devices forever.

Adding xhci and usb core dynamic debug could show more info about this.
before suspeding could you as root add:

mount -t debugfs none /sys/kernel/debug
echo 'module xhci_hcd =p' >/sys/kernel/debug/dynamic_debug/control
echo 'module usbcore =p' >/sys/kernel/debug/dynamic_debug/control

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