WARN: Success on ctrl setup TRB without IOC set??

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Hi Mathias,

I am implementing USB2 EHSET SINGLE_STEP_SET_FEATURE Test for XHCI port,
(see ehset_single_step_set_feature for EHCI), it needs to set IOC
for setup packet, and software waits 15 seconds before DATA + STATUS stage.
After porting such design for XHCI, it triggers above warning, and
returns -ESHUTDOWN for URB. Any reasons why we don't allow completion
interrupt for SETUP stage? Thanks.

-- 

Best Regards,
Peter Chen
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