> + if (cmd == MOXA_SET_SPECIAL_BAUD_RATE) {
> + int speed;
> +
> + if (get_user(speed, (int __user *)argp))
> + return -EFAULT;
> + if (speed <= 0 || speed > info->max_baud)
> + return -EFAULT;
-EINVAL
> + if (!info->tty || !info->tty->termios || !info->ioaddr)
> + return 0;
!info->tty and !info->tty->termios can't happen
> + info->tty->termios->c_cflag &= ~(CBAUD | CBAUDEX);
No...
> + for (i = 0; i < BAUD_TABLE_NO; i++)
> + if (speed == mxvar_baud_table[i])
> + break;
> + if (i == BAUD_TABLE_NO) {
> + info->tty->termios->c_cflag |= B_SPEC;
> + } else if (speed != 0)
> + info->tty->termios->c_cflag |= mxvar_baud_table1[i];
Replace all the above mess with a single tty_encode_baud_rate call
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