[Bug 221184] mouse/keyboard (connected via hub) usb reset under system load with weak cpu

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221184

--- Comment #38 from Michał Pecio (michal.pecio@gmail.com) ---
I have a repro of usbhid toggle mismatch and unnecessary packet loss on xHCI.

1. press and hold a key
2. briefly disconnect D+ to break communication (D- if a full speed device)
3. xhci-hcd resets host toggle, but device toggle is unaffected
4. release the key - the host ignores device packet due to toggle mismatch

There is 50% chance that host toggle is already zero and reset does nothing. If
the above doesn't work, flip toggle by pressing two keys one by one and
releasing them together to generate three packets. Then repeat steps 1-4.

Moving the EPROTO case to EPIPE case seems to fix it. (I also added msleep(500)
before the call to usb_clear_halt() to give myself time to reconnect D+,
otheriwse usb_clear_halt() fails and the device is reset).

I wonder if this change would help for any of the xHCI problems mentioned here?
And what effect it has on the EHCI problems?

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