Re: [PATCH] tty: serial: kgdboc: Fix 8250_* kgd over serial

[kernel test robot <lkp@intel.com>]

Hi Michael,

kernel test robot noticed the following build errors:

[auto build test ERROR on tty/tty-testing]
[also build test ERROR on tty/tty-next tty/tty-linus linus/master v6.7-rc5 next-20231215]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Michael-Trimarchi/tty-serial-kgdboc-Fix-8250_-kgd-over-serial/20231217-013726
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing
patch link:    https://lore.kernel.org/r/20231216173409.1264655-1-michael%40amarulasolutions.com
patch subject: [PATCH] tty: serial: kgdboc: Fix 8250_* kgd over serial
config: i386-buildonly-randconfig-003-20231217 (https://download.01.org/0day-ci/archive/20231217/202312171302.vjOAqLOI-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231217/202312171302.vjOAqLOI-lkp@intel.com/reproduce)

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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202312171302.vjOAqLOI-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/tty/serial/serial_core.c:2636:26: error: expression is not assignable
           if (!port || port->type = PORT_UNKNOWN || !(port->ops->poll_get_char && port->ops->poll_put_char)) {
               ~~~~~~~~~~~~~~~~~~~ ^
   1 error generated.


vim +2636 drivers/tty/serial/serial_core.c

  2618	
  2619	static int uart_poll_init(struct tty_driver *driver, int line, char *options)
  2620	{
  2621		struct uart_driver *drv = driver->driver_state;
  2622		struct uart_state *state = drv->state + line;
  2623		enum uart_pm_state pm_state;
  2624		struct tty_port *tport;
  2625		struct uart_port *port;
  2626		int baud = 9600;
  2627		int bits = 8;
  2628		int parity = 'n';
  2629		int flow = 'n';
  2630		int ret = 0;
  2631	
  2632		tport = &state->port;
  2633		mutex_lock(&tport->mutex);
  2634	
  2635		port = uart_port_check(state);
> 2636		if (!port || port->type = PORT_UNKNOWN || !(port->ops->poll_get_char && port->ops->poll_put_char)) {
  2637			ret = -1;
  2638			goto out;
  2639		}
  2640	
  2641		pm_state = state->pm_state;
  2642		uart_change_pm(state, UART_PM_STATE_ON);
  2643	
  2644		if (port->ops->poll_init) {
  2645			/*
  2646			 * We don't set initialized as we only initialized the hw,
  2647			 * e.g. state->xmit is still uninitialized.
  2648			 */
  2649			if (!tty_port_initialized(tport))
  2650				ret = port->ops->poll_init(port);
  2651		}
  2652	
  2653		if (!ret && options) {
  2654			uart_parse_options(options, &baud, &parity, &bits, &flow);
  2655			console_list_lock();
  2656			ret = uart_set_options(port, NULL, baud, parity, bits, flow);
  2657			console_list_unlock();
  2658		}
  2659	out:
  2660		if (ret)
  2661			uart_change_pm(state, pm_state);
  2662		mutex_unlock(&tport->mutex);
  2663		return ret;
  2664	}
  2665	

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