[sound:topic/hda-core-intel 1/7] sound/hda/ext/hdac_ext_controller.c:283:3: error: 'bus' undeclared; did you mean 'ebus'?

[sound:topic/hda-core-intel 1/7] sound/hda/ext/hdac_ext_controller.c:283:3: error: 'bus' undeclared; did you mean 'ebus'?

[kbuild test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git topic/hda-core-intel
head:   21b51c0d69680da7cdf4c83d274edef2fe4f27bc
commit: 7b4986f0c30484370183d935821b826c855c28bf [1/7] ALSA: hdac: ext: add wait for codec to respond after link reset
config: x86_64-randconfig-x008-201825 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        git checkout 7b4986f0c30484370183d935821b826c855c28bf
        # save the attached .config to linux build tree
        make ARCH=x86_64 

Note: the sound/topic/hda-core-intel HEAD 21b51c0d69680da7cdf4c83d274edef2fe4f27bc builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   sound/hda/ext/hdac_ext_controller.c: In function 'snd_hdac_ext_bus_link_get':
>> sound/hda/ext/hdac_ext_controller.c:283:3: error: 'bus' undeclared (first use in this function); did you mean 'ebus'?
      bus->codec_mask = snd_hdac_chip_readw(bus, STATESTS);
      ^~~
      ebus
   sound/hda/ext/hdac_ext_controller.c:283:3: note: each undeclared identifier is reported only once for each function it appears in

vim +283 sound/hda/ext/hdac_ext_controller.c

   258	
   259	int snd_hdac_ext_bus_link_get(struct hdac_ext_bus *ebus,
   260					struct hdac_ext_link *link)
   261	{
   262		int ret = 0;
   263	
   264		mutex_lock(&ebus->lock);
   265	
   266		/*
   267		 * if we move from 0 to 1, count will be 1 so power up this link
   268		 * as well, also check the dma status and trigger that
   269		 */
   270		if (++link->ref_count == 1) {
   271			if (!ebus->cmd_dma_state) {
   272				snd_hdac_bus_init_cmd_io(&ebus->bus);
   273				ebus->cmd_dma_state = true;
   274			}
   275	
   276			ret = snd_hdac_ext_bus_link_power_up(link);
   277	
   278			/*
   279			 *  wait for 521usec for codec to report status
   280			 *  HDA spec section 4.3 - Codec Discovery
   281			 */
   282			udelay(521);
 > 283			bus->codec_mask = snd_hdac_chip_readw(bus, STATESTS);
   284			dev_dbg(bus->dev, "codec_mask = 0x%lx\n", bus->codec_mask);
   285			snd_hdac_chip_writew(bus, STATESTS, bus->codec_mask);
   286		}
   287	
   288		mutex_unlock(&ebus->lock);
   289		return ret;
   290	}
   291	EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_get);
   292	

---
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