drivers/net/wireless/mediatek/mt76/mac80211.c:119: undefined reference to `devm_of_led_classdev_register'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   5fbdefcf685defd8bc5a8f37b17538d25c58d77a
commit: 7bc04215a66b60e198aecaee8418f6d79fa19faa mt76: add driver code for 
MT76x2e
date:   3 months ago
config: x86_64-randconfig-b0-03032320 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout 7bc04215a66b60e198aecaee8418f6d79fa19faa
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/net/wireless/mediatek/mt76/mac80211.o: In function `mt76_led_init':
>> drivers/net/wireless/mediatek/mt76/mac80211.c:119: undefined reference to 
>> `devm_of_led_classdev_register'

vim +119 drivers/net/wireless/mediatek/mt76/mac80211.c

17f1de56 Felix Fietkau 2017-11-21   92  
17f1de56 Felix Fietkau 2017-11-21   93  static int mt76_led_init(struct 
mt76_dev *dev)
17f1de56 Felix Fietkau 2017-11-21   94  {
17f1de56 Felix Fietkau 2017-11-21   95          struct device_node *np = 
dev->dev->of_node;
17f1de56 Felix Fietkau 2017-11-21   96          struct ieee80211_hw *hw = 
dev->hw;
17f1de56 Felix Fietkau 2017-11-21   97          int led_pin;
17f1de56 Felix Fietkau 2017-11-21   98  
17f1de56 Felix Fietkau 2017-11-21   99          if 
(!dev->led_cdev.brightness_set && !dev->led_cdev.blink_set)
17f1de56 Felix Fietkau 2017-11-21  100                  return 0;
17f1de56 Felix Fietkau 2017-11-21  101  
17f1de56 Felix Fietkau 2017-11-21  102          snprintf(dev->led_name, 
sizeof(dev->led_name),
17f1de56 Felix Fietkau 2017-11-21  103                   "mt76-%s", 
wiphy_name(hw->wiphy));
17f1de56 Felix Fietkau 2017-11-21  104  
17f1de56 Felix Fietkau 2017-11-21  105          dev->led_cdev.name = 
dev->led_name;
17f1de56 Felix Fietkau 2017-11-21  106          dev->led_cdev.default_trigger =
17f1de56 Felix Fietkau 2017-11-21  107                  
ieee80211_create_tpt_led_trigger(hw,
17f1de56 Felix Fietkau 2017-11-21  108                                          
IEEE80211_TPT_LEDTRIG_FL_RADIO,
17f1de56 Felix Fietkau 2017-11-21  109                                          
mt76_tpt_blink,
17f1de56 Felix Fietkau 2017-11-21  110                                          
ARRAY_SIZE(mt76_tpt_blink));
17f1de56 Felix Fietkau 2017-11-21  111  
17f1de56 Felix Fietkau 2017-11-21  112          np = of_get_child_by_name(np, 
"led");
17f1de56 Felix Fietkau 2017-11-21  113          if (np) {
17f1de56 Felix Fietkau 2017-11-21  114                  if 
(!of_property_read_u32(np, "led-sources", &led_pin))
17f1de56 Felix Fietkau 2017-11-21  115                          dev->led_pin = 
led_pin;
17f1de56 Felix Fietkau 2017-11-21  116                  dev->led_al = 
of_property_read_bool(np, "led-active-low");
17f1de56 Felix Fietkau 2017-11-21  117          }
17f1de56 Felix Fietkau 2017-11-21  118  
17f1de56 Felix Fietkau 2017-11-21 @119          return 
devm_led_classdev_register(dev->dev, &dev->led_cdev);
17f1de56 Felix Fietkau 2017-11-21  120  }
17f1de56 Felix Fietkau 2017-11-21  121  

:::::: The code at line 119 was first introduced by commit
:::::: 17f1de56df051229988aab37e01971c9713c4a31 mt76: add common code shared 
between multiple chipsets

:::::: TO: Felix Fietkau <n...@nbd.name>
:::::: CC: Kalle Valo <kv...@codeaurora.org>

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