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Needed to make sure usb redirection is prepared to actually handle the callback from the usb host adapter. Without this interrupt endpoints don't work on xhci. Note: On ehci the usb_wakeup() call only schedules a BH for the actual work, which hides this bug because the allocation happens before ehci calls back even without this patch. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Message-id: 1476096313-7730-1-git-send-email-kraxel@redhat.com Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>