linux-kernel - Re: The console log is doubled if earlycon is enabled

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Message-ID: <CAHp75Ven8H1DYuTYcWRpt4rTxhS=P5r7VJ2ajpK8H7j+rgbMYg@mail.gmail.com>
Date:	Sun, 29 Nov 2015 04:30:37 +0200
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Peter Hurley <peter@...leysoftware.com>,
	Rob Herring <robherring2@...il.com>
Subject: Re: The console log is doubled if earlycon is enabled

On Fri, Nov 27, 2015 at 12:21 PM, Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> Hi,
>
>
> If I add "earlycon" to the kernel parameter, the log message
> on the earlycon is also displayed to the regular console.
> In other words, the same log messages are displayed twice.
>
> I noticed this problem on v4.4-rc1.
> It has not been fixed in the mainline yet, I think.
>
> Anybody who has a clue?
> (I have not done git-bisect yet.)

Does adding the following line in
drivers/tty/serial/8250/8250_early.c:: early_serial8250_setup() fix
the issue?

device->con->flags &= ~CON_PRINTBUFFER;

-- 
With Best Regards,
Andy Shevchenko
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