Re: [linux-usb-devel] Serial-Core: USB-Serial port current issues.

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Luiz Fernando N. Capitulino wrote:
|   take mutex
|   take port lock
| again:
|   save local copy of icount
|   release port lock
|   get_mctrl
|   take port lock
|   if (icount changed)
|     goto again
|   update tty->hw_stopped
|   release port lock
|   release mutex

 Well, I think it'd work. But how can we keep track of 'icount'?
Should the driver add 1 if it updates 'tty->hw_stopped'?
The only thing about icount that needs to be
tracked is that it changes, which indicates
an interrupt might have changed hw_stopped.
If icount changes at all, invalidate the last
reading of the state and do it again. The way
icount is incremented is not changed.

Like I said, it is really ugly. I was just looking
for a way of allowing get_mctrl to sleep if necessary.

--
Paul Fulghum
Microgate Systems, Ltd.
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