[Bug 218890] reset SuperSpeed USB device number 2 using xhci_hcd

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218890

--- Comment #9 from Mathias Nyman (mathias.nyman@linux.intel.com) ---
Traces show xhci driver sets the length of the cancelled 512 byte bulk transfer 
incorrectly.

I'll attach a patch for that.

The 255 byte control transfer case is not that clear.
It stops on the data stage with a 'stopped' completion code, with 'len' field
indicating residual untransferred bytes is 0.

 827.939738: xhci_handle_event: EVENT: TRB 00000001511921e0 status 'Stopped'
len 0 slot 2 ep 1 type 'Transfer Event' flags e:c

 827.939747: xhci_handle_transfer: CTRL: Buffer 00000001023cff00 length 255 TD
size 0 intr 0 type 'Data Stage' flags i:i:c:s:I:e:C

It's also unclear why these transfers don't go through

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