Re: [REGRESSION] "USB: use kfifo to buffer usb-generic serialwrites" causes gobi_loader to hang

[Alan Cox]

> The log shows no call to usb_serial_generic_write_room()
> Do you consider this a bug in the tty layer?

Actually this all makes sense because of where it was hanging. A reply of
0 to the tty->ops->write will cause it to either return (O_NONBLOCK) or
sleep in the n_tty write code waiting for a write_wait wakeup
(tty_wakeup(tty))

So the fix does indeed look correct.
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