Re: [PATCH 4/5] usb_serial: Kill port mutex

[Alan Cox]

> update the last_busy time in the completion of every input URB).  When
> the driver is throttled no URBs will be submitted, so the usage count
> will remain at 0 with no effort on the part of throttle().

You can still get modem changes (set_mctrl), break etc with the port
throttled, or indeed output.

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