linux-kernel - Re: [PATCH v6 4/6] serial: core: Add support for DEVNAME:0.0 style naming for kernel console

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Date: Wed, 14 Feb 2024 12:00:14 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: oe-kbuild@...ts.linux.dev, Tony Lindgren <tony@...mide.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>, Petr Mladek <pmladek@...e.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	John Ogness <john.ogness@...utronix.de>,
	Sergey Senozhatsky <senozhatsky@...omium.org>
Cc: lkp@...el.com, oe-kbuild-all@...ts.linux.dev,
	"David S . Miller" <davem@...emloft.net>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Dhruva Gole <d-gole@...com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Johan Hovold <johan@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Vignesh Raghavendra <vigneshr@...com>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH v6 4/6] serial: core: Add support for DEVNAME:0.0 style
 naming for kernel console

Hi Tony,

kernel test robot noticed the following build warnings:

url:    https://github.com/intel-lab-lkp/linux/commits/Tony-Lindgren/printk-Save-console-options-for-add_preferred_console_match/20240213-171012
base:   6cc3028f797a549f256d593867a769ab6a8265f2
patch link:    https://lore.kernel.org/r/20240213084545.40617-5-tony%40atomide.com
patch subject: [PATCH v6 4/6] serial: core: Add support for DEVNAME:0.0 style naming for kernel console
config: i386-randconfig-141-20240214 (https://download.01.org/0day-ci/archive/20240214/202402141619.BqEGGzwm-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
| Closes: https://lore.kernel.org/r/202402141619.BqEGGzwm-lkp@intel.com/

smatch warnings:
drivers/tty/serial/serial_base_bus.c:255 serial_base_add_preferred_console() error: uninitialized symbol 'port_match'.

vim +/port_match +255 drivers/tty/serial/serial_base_bus.c

a2020a9ccacd63 Tony Lindgren 2024-02-13  252  int serial_base_add_preferred_console(struct uart_driver *drv,
a2020a9ccacd63 Tony Lindgren 2024-02-13  253  				      struct uart_port *port)
a2020a9ccacd63 Tony Lindgren 2024-02-13  254  {
a2020a9ccacd63 Tony Lindgren 2024-02-13 @255  	const char *port_match __free(kfree);

Someone should add this to checkpatch.  These always need to be
initialized to NULL.

a2020a9ccacd63 Tony Lindgren 2024-02-13  256  	int ret;
a2020a9ccacd63 Tony Lindgren 2024-02-13  257  
a2020a9ccacd63 Tony Lindgren 2024-02-13  258  	ret = serial_base_add_prefcon(drv->dev_name, port->line);
a2020a9ccacd63 Tony Lindgren 2024-02-13  259  	if (ret)
a2020a9ccacd63 Tony Lindgren 2024-02-13  260  		return ret;
a2020a9ccacd63 Tony Lindgren 2024-02-13  261  
a2020a9ccacd63 Tony Lindgren 2024-02-13  262  	port_match = kasprintf(GFP_KERNEL, "%s:%i.%i", dev_name(port->dev),
a2020a9ccacd63 Tony Lindgren 2024-02-13  263  			       port->ctrl_id, port->port_id);
a2020a9ccacd63 Tony Lindgren 2024-02-13  264  	if (!port_match)
a2020a9ccacd63 Tony Lindgren 2024-02-13  265  		return -ENOMEM;
a2020a9ccacd63 Tony Lindgren 2024-02-13  266  
a2020a9ccacd63 Tony Lindgren 2024-02-13  267  	/* Translate a hardware addressing style console=DEVNAME:0.0 */
a2020a9ccacd63 Tony Lindgren 2024-02-13  268  	return serial_base_add_one_prefcon(port_match, drv->dev_name, port->line);
a2020a9ccacd63 Tony Lindgren 2024-02-13  269  }

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki