hciattach set_speed question

Hi,

I see that when hciattach.c set a new baud speed on the serial
port, it executes:

        cfsetospeed(ti, uart_speed(speed));
        return tcsetattr(fd, TCSANOW, ti);

my question is why doesn't it have to execute cfsetispeed as well ?
why only cfsetospeed ?

Thanks a lot
choi

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