Dear Alan and Oliver,

> Oliver Neukum <oneu...@suse.com> hat am 18. April 2017 um 09:37 geschrieben:
> 
> You can call usb_kill_anchored_urbs() always.

> Alan Stern <st...@rowland.harvard.edu> hat am 17. April 2017 um 16:14 
> geschrieben:
> 
> It is not necessary to call usb_wait_anchor_empty_timeout() before 
> calling usb_kill_anchored_urbs().
> 

thank you for your clarifications. This means that my fix was only a workaround 
and the problem is caused somewhere in the xhci driver (and has hopefully 
already been resolved after linux-4.1).

Best regards,
 Rolf
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