linux-kernel - Re: 2.6.25.3: serial problem (minicom)

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Message-Id: <200806180215.45925.hpj@urpla.net>
Date:	Wed, 18 Jun 2008 02:15:45 +0200
From:	"Hans-Peter Jansen" <hpj@...la.net>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org, "R.L. Horn" <lists@...tcheap.org>
Subject: Re: 2.6.25.3: serial problem (minicom)

Am Dienstag, 17. Juni 2008 schrieb Alan Cox:
> On Mon, 16 Jun 2008 23:22:54 -0500 (CDT)
>
> "R.L. Horn" <lists@...tcheap.org> wrote:
> > On Mon, 16 Jun 2008, Alan Cox wrote:
> > > Whatever it implies the behaviour should not have changed between
> > > 2.6.24 and 2.6.25. Nobody AFAIK sat down and decided to change it.
> >
> > And, besides, I've gotten reports that the usb-serial drivers still
> > behave the same as with 2.6.24.
> >
> > It looks like the call to tty_termios_encode_baud_rate() in
> > drivers/serial/8250.c is the culprit.  If I comment it out, everything
> > appears to go back to normal (seemingly with no undesired side
> > effects).
> >
> > Why the call is there (it didn't replace anything else in the 2.6.24.7
> > version of 8250.c, though it did in serial_core.c) remains a mystery to
> > me.
>
> Ah ok I know what the bug is - it was fixed in 2.6.26-rc as follows
>
> +       /* Don't rewrite B0 */
> +       if (tty_termios_baud_rate(termios))
> +               tty_termios_encode_baud_rate(termios, baud, baud);
>  }

Alan, could this issue lead to dysfunctional serial dcf77 receivers, too? 
(and could you point my to the related git changeset?)

I'm using ntpd "127.127.8.0 mode 16" devices since a decade now (RAWDCF 
receiver: DTR=low/RTS=high) and after upgrading to openSUSE 11.0, which is 
using 2.6.25.5, those get no power anymore :-(.

Or do you have another idea? I currently prepare a test system, and would be 
ready for kernel patching tomorrow..

TIA, Pete
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