Re: [RFC PATCH 0/1] media: uvcvideo: reset interface on bulk stream stop

[Michal Pecio]

On Tue, 26 May 2026 09:55:19 +0000, Henry Lin wrote:
> I tested 25e531b422dc ("usb: xhci: Make usb_host_endpoint.hcpriv
> survive endpoint_disable()") on the affected setup, and it fixes the
> issue.

Good.
 
> With that change applied, repeated stop/start cycles complete
> successfully, and I no longer see the uvcvideo -71 transfer errors.

Were you seeing one such error for each restart, followed by uvcvideo
dropping a few frames and continuing to stream normally, or multiple
transaction errors and complete functional failure?

I was seeing the formrer on several tested HCs, except for those from
ASMedia which never completed the affected URB at all (IMO a HW bug).

I think multiple errors would also be an indication of some bug,
possibly in HW, possibly worth looking into in its own right.

Regards,
Michal