On Sat, 08 Sep 2012 12:14:39 +0200
peter.sheeren@xxxxxxxxx wrote:
> if (((old_priv.flags & ASYNC_SPD_MASK) !=
> (priv->flags & ASYNC_SPD_MASK)) ||
> (((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) &&
> (old_priv.custom_divisor != priv->custom_divisor))) {
> change_speed(tty, port);
>
> Function change_speed() is called only when the baudrate
> (custom_divisor) has changed but after a USB replug this assumption is
> wrong. Also note that /dev/ttyUSB0 remains in existence on the system
> under test. If it were up to me, I'd always send the baudrate setting
> over the USB bus nomatter whether the baudrate (supposedly) has
> changed or not.
We don't do that because if you gratuitously send speed changes that have
no effect the hardware seems to reset its configuration and you lose
characters, something a lot of software doesn't expect.
If you think that if check is the problem can you replace it with an
unconditional call to change_speed(tty, port) and the re-test. That will
confirm if it is the cause.
If it is then we can think about fixing it somehow.
Alan
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