Re: [PATCH v2] platform/x86: dell-uart-backlight: fall back to PCH PWM on UART timeout

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

Hi,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[also build test ERROR on v7.3-rc6 next-20261008]
[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/chitranshmandhaniya-gmail-com/platform-x86-dell-uart-backlight-fall-back-to-PCH-PWM-on-UART-timeout/20261009-125401
base:   linus/master
patch link:    https://lore.kernel.org/r/20261009072401.52509-1-chitranshmandhaniya%40gmail.com
patch subject: [PATCH v2] platform/x86: dell-uart-backlight: fall back to PCH PWM on UART timeout
config: i386-buildonly-randconfig-1000-20261010 (https://download.01.org/0day-ci/archive/20261010/202610100706.x2lcbo7S-lkp@intel.com/config)
compiler: gcc-13 (Debian 13.3.0-16) 13.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261010/202610100706.x2lcbo7S-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/202610100706.x2lcbo7S-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/platform/x86/dell/dell-uart-backlight.c: In function 'dell_pwm_fallback_register':
>> drivers/platform/x86/dell/dell-uart-backlight.c:318:16: error: cleanup argument not a function
     318 |         struct pci_dev *gpu __free(pci_dev_put) = NULL;
         |                ^~~~~~~


vim +318 drivers/platform/x86/dell/dell-uart-backlight.c

   315	
   316	static int dell_pwm_fallback_register(struct device *dev)
   317	{
 > 318		struct pci_dev *gpu __free(pci_dev_put) = NULL;
   319		struct backlight_properties props = {};
   320		struct dell_pwm_backlight *pwm;
   321		struct backlight_device *bl;
   322		resource_size_t bar0;
   323		u32 freq, duty, ctl;
   324	
   325		gpu = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
   326		if (!gpu || gpu->vendor != PCI_VENDOR_ID_INTEL) {
   327			dev_warn(dev, "No Intel GPU found, cannot fall back to PCH PWM\n");
   328			return -ENODEV;
   329		}
   330	
   331		bar0 = pci_resource_start(gpu, 0);
   332		if (!bar0) {
   333			dev_warn(dev, "Intel GPU BAR0 not assigned\n");
   334			return -ENODEV;
   335		}
   336	
   337		pwm = devm_kzalloc(dev, sizeof(*pwm), GFP_KERNEL);
   338		if (!pwm)
   339			return -ENOMEM;
   340	
   341		pwm->mmio = devm_ioremap(dev, bar0 + PCH_BLC_PWM_CTL, SZ_16);
   342		if (!pwm->mmio) {
   343			dev_warn(dev, "Failed to ioremap PCH PWM registers\n");
   344			return -ENOMEM;
   345		}
   346	
   347		ctl  = readl(pwm->mmio);
   348		freq = readl(pwm->mmio + (PCH_BLC_PWM_FREQ - PCH_BLC_PWM_CTL));
   349		duty = readl(pwm->mmio + (PCH_BLC_PWM_DUTY - PCH_BLC_PWM_CTL));
   350	
   351		if (!(ctl & PCH_BLC_PWM_ENABLE) || freq == 0) {
   352			dev_warn(dev, "PCH PWM not enabled by BIOS (ctl=0x%08x freq=%u)\n", ctl, freq);
   353			return -ENODEV;
   354		}
   355	
   356		pwm->max_brightness = freq;
   357	
   358		dev_info(dev, "Falling back to PCH PWM backlight (max=%u current=%u)\n", freq, duty);
   359	
   360		props.type = BACKLIGHT_PLATFORM;
   361		props.brightness = duty;
   362		props.max_brightness = freq;
   363	
   364		bl = devm_backlight_device_register(dev, "dell_uart_backlight", dev, pwm,
   365						    &dell_pwm_backlight_ops, &props);
   366		return PTR_ERR_OR_ZERO(bl);
   367	}
   368	

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