linux-kernel - Re: [PATCH v2 -next 10/13] serial: earlycon: Allow earlycon params with name only

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Message-ID: <54F87C15.6020801@hurleysoftware.com>
Date:	Thu, 05 Mar 2015 10:53:57 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Rob Herring <robh@...nel.org>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>
Subject: Re: [PATCH v2 -next 10/13] serial: earlycon: Allow earlycon params
 with name only

On 03/05/2015 10:46 AM, Rob Herring wrote:
> On Sun, Mar 1, 2015 at 10:05 AM, Peter Hurley <peter@...leysoftware.com> wrote:
>> Allow earlycon param strings of the form
>>    earlycon=<name>
> 
> Humm, that should already be the case with ARM semihosting (smh).
> 
> Rob

Then it's passing a bogus options string to parse_options()


>>
>> Signed-off-by: Peter Hurley <peter@...leysoftware.com>
>> ---
>>  drivers/tty/serial/earlycon.c | 11 +++++++----
>>  1 file changed, 7 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
>> index da5e8c8..025ea01 100644
>> --- a/drivers/tty/serial/earlycon.c
>> +++ b/drivers/tty/serial/earlycon.c
>> @@ -109,13 +109,16 @@ int __init setup_earlycon(char *buf, const char *match,
>>         len = strlen(match);
>>         if (strncmp(buf, match, len))
>>                 return 0;
>> -       if (buf[len] && (buf[len] != ','))
>> -               return 0;
>>
>> -       buf += len + 1;
>> +       if (buf[len]) {
>> +               if (buf[len] != ',')
>> +                       return 0;
>> +               buf += len + 1;
>> +       } else
>> +               buf = NULL;
>>
>>         /* On parsing error, pass the options buf to the setup function */
>> -       if (!parse_options(&early_console_dev, buf))
>> +       if (buf && !parse_options(&early_console_dev, buf))
>>                 buf = NULL;
>>
>>         port->uartclk = BASE_BAUD * 16;
>> --
>> 2.3.0
>>

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