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Date: Wed, 6 Jun 2007 16:03:10 +0100
From: Alan Cox <alan@...rguk.ukuu.org.uk>
To: David Woodhouse <dwmw2@...radead.org>
Cc: akpm@...l.org, linux-kernel@...r.kernel.org, paulus@...ba.org
Subject: Re: [SERIAL] Don't optimise away baud rate changes when BOTHER is
used
On Wed, 06 Jun 2007 13:30:10 +0100
David Woodhouse <dwmw2@...radead.org> wrote:
> The uart_set_termios() function will bail out early without bothering to
> touch the hardware, if it decides that nothing "relevant" has changed.
> Unfortunately, its idea of "relevant" doesn't include c_[io]speed. So if
> the baud rate bits are BOTHER and you just change the speed, the change
> gets optimised away.
>
> This patch makes it ignore the old Bfoo bits in c_cflag and just check
> whether c_ispeed and c_ospeed have changed. Those integers are always
> set appropriately for us by set_termios().
Yep - and there are some other changes needed as well once everyone gets
their ports properly lined up (notably handing back the actual speed).
Acked-by: Alan Cox <alan@...hat.com>
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