Hi!

hci_uart_set_flow_control() contains some rather suspicious
code. AFAICT:

set = 0.

Then we do set &= (magic constant). But as set is 0, it stays zero. It
just does not make sense. [Nor does it make sense to do |= on known
value of zero just after else. But that's probably just some artifact
of editing.]

(And if you edit the code anyway, temporary variable to store
TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 | TIOCM_OUT2 | TIOCM_LOOP would
make sense.)

Thanks,
                                                                Pavel


/* Flow control or un-flow control the device */
void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
{
        ...
        unsigned int set = 0;
        unsigned int clear = 0;

        if (enable) {
                ...
                set &= ~(TIOCM_OUT2 | TIOCM_RTS);
                clear = ~set;
                set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
                       TIOCM_OUT2 | TIOCM_LOOP;
                clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
                         TIOCM_OUT2 | TIOCM_LOOP;
                status = tty->driver->ops->tiocmset(tty, set, clear);
                BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
        } else {
               ...      
                set |= (TIOCM_OUT2 | TIOCM_RTS);

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) 
http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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