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

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Message-ID: <CAK7LNATW2EtdKYWUOrFgynoyHP9k5gh9dAMzgUM3HwYTN=eNHQ@mail.gmail.com>
Date:	Mon, 30 Nov 2015 11:27:41 +0900
From:	Masahiro Yamada <yamada.masahiro@...ionext.com>
To:	Andy Shevchenko <andy.shevchenko@...il.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

Hi Andy,

2015-11-29 11:30 GMT+09:00 Andy Shevchenko <andy.shevchenko@...il.com>:
> 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;


No. I tried that, but it did not fix the problem.


-- 
Best Regards
Masahiro Yamada
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