linux-kernel - Re: [PATCH] serial: core: Add support for dev

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Message-ID: <87431096-e883-c90d-853e-44a463c0e8f2@kernel.org>
Date:   Wed, 19 Jul 2023 07:29:28 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Dhruva Gole <d-gole@...com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        John Ogness <john.ogness@...utronix.de>,
        Johan Hovold <johan@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-omap@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: core: Add support for dev_name:0.0 naming for
 kernel console

On 19. 07. 23, 7:28, Tony Lindgren wrote:
> * Jiri Slaby <jirislaby@...nel.org> [230719 05:25]:
>> On 19. 07. 23, 7:15, Tony Lindgren wrote:
>>> +/*
>>> + * Add preferred console if configured on kernel command line with naming
>>> + * "console=dev_name:0.0".
>>> + */
>>> +static int serial_core_add_preferred_console(struct uart_driver *drv,
>>> +					     struct uart_port *port)
>>> +{
>>> +	char *port_match, *opt, *name;
>>> +	int len, ret = 0;
>>> +
>>> +	port_match = kasprintf(GFP_KERNEL, "console=%s:%i.%i",
>>> +			       dev_name(port->dev), port->ctrl_id,
>>> +			       port->port_id);
>>> +	if (!port_match)
>>> +		return -ENOMEM;
>>> +
>>> +	opt = strstr(saved_command_line, port_match);
>>> +	if (!opt)
>>> +		goto free_port_match;
>>> +
>>> +	len = strlen(port_match);
>>> +
>>> +	if (strlen(opt) > len + 1 && opt[len] == ',')
>>> +		opt += len + 1;
>>> +	else
>>> +		opt = NULL;
>>> +
>>> +	name = kstrdup(drv->dev_name, GFP_KERNEL);
>>
>> Why do you dup the name here?
> 
> I was getting ignoring const warning, but maybe the right solution is
> to just use const char *name here.. Let me check.

So fix add_preferred_console() instead ;).

thanks,
-- 
js
suse labs