linux-kernel - Re: [BUG]: 2.6.19.2: Weird serial core issue

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Message-ID: <6d6a94c50701311833m5952c6fdn8e1f0db28d674e79@mail.gmail.com>
Date:	Thu, 1 Feb 2007 10:33:40 +0800
From:	"Aubrey Li" <aubreylee@...il.com>
To:	Alan <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [BUG]: 2.6.19.2: Weird serial core issue

On 2/1/07, Alan <alan@...rguk.ukuu.org.uk> wrote:
> > When I telnet my board and run the following command:
> > ---- root:~> stty -F /dev/ttyS0 -crtscts
> >
> > I got the following result from the console of my board:
> > ---- root:~>new_termios flag: 0x1cb1, old_termios flag: 0x80001cb1
> >
> > That's correct. CRTSCTS flag is clear
> >
> > But when I type "ENTER" key on the console, I got:
> > ----root:~>new_termios flag: 0x80001cb1, old_termios flag: 0x1cb1
>
> What code is running on that console at the time. Most likely that user
> code is also saving/restoring terminal settings so overwrite yours
>

I implemented the serial driver by myself, :). See the attachment.
I didn't save/restore terminal setting in the my_set_termios().

I trace this back till tty_tioctl(..., unsigned long arg), everytime I
type "ENTER" key,
the argument "arg" passed into tty_ioctl() is the address of a termios
structure, which include wrong c_cflag. It seems once the flag is
assigned by uart_set_options the first time, it's never changed. So
even userspace application changed the flag, it will be set back soon.
I'll dig into it. But I still think it's a bug.

-Aubrey

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