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    SubjectRe: 2.6.25.3: serial problem (minicom)
    Date
    Am Dienstag, 17. Juni 2008 schrieb Alan Cox:
    > On Mon, 16 Jun 2008 23:22:54 -0500 (CDT)
    >
    > "R.L. Horn" <lists@eastcheap.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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