[Bug 220748] usb: xhci_queue_isoc_tx_prepare ignore start_frame and always assumes URB_ISO_ASAP is set

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220748

--- Comment #12 from Michał Pecio (michal.pecio@gmail.com) ---
Oops, sorry for accidental post. This was meant to say that the solution to not
changing polling interval mid-stream already exists in UHCI and isn't very
hard.

As for bandwidth reservation, the problem could be ignored ("you are requesting
something really weird, deal with it"). Or in case of xHCI I think it could
also be solved - changing BW allocation involves similar steps as changing the
interval, so they could be done both (as long as there are no pending URBs).

BTW, purely for testing purposes, I suppose one could hack the kernel to modify
device's descriptor and reduce polling interval. If this helps, then there
would be grounds for wondering about how to implement interval switching more
cleanly.

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