Re: [PATCH] [usb-serial] fix Ooops on uplug

[Alan Cox]

> The reason is that the serial port's resources are freed upon
> disconnect (in serial_hangup()) but the tty device layer is not made
> aware of that. Hence, the close callback will later access the
> resources again.

tty_port_hangup() is part of the hangup path and the physical resources
should not be touched after the hangup completes. It's a good
indication of where the bug might be but its not I suspect the fix as
we now leak the resources.

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