Hi Takashi,

FYI, there are new smatch warnings show up in

tree: git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-unstable.git master head: 02e5aa7b459f69538d4ec88658d064816a7692d6 commit: 95836563e7f636fc57732f5e687ca2f170eb674f ALSA: hda - Introduce cache & flush cmd / amp writes date: 33 hours ago

sound/pci/hda/hda_codec.c:3433 snd_hda_codec_write_cache() error: we previously assumed 'c' could be null (see line 3430)

vim +/c +3433 sound/pci/hda/hda_codec.c

aa2936f5 Takashi Iwai 2009-05-26 3424 /* parm may contain the verb stuff for get/set amp */ aa2936f5 Takashi Iwai 2009-05-26 3425 verb = verb | (parm >> 8); aa2936f5 Takashi Iwai 2009-05-26 3426 parm &= 0xff; aa2936f5 Takashi Iwai 2009-05-26 3427 key = build_cmd_cache_key(nid, verb); aa2936f5 Takashi Iwai 2009-05-26 3428 mutex_lock(&codec->bus->cmd_mutex); aa2936f5 Takashi Iwai 2009-05-26 3429 c = get_alloc_hash(&codec->cmd_cache, key); aa2936f5 Takashi Iwai 2009-05-26 @3430 if (c) aa2936f5 Takashi Iwai 2009-05-26 3431 c->val = parm; 95836563 Takashi Iwai 2012-12-13 3432 if (codec->cached_write) 95836563 Takashi Iwai 2012-12-13 @3433 c->dirty = 1; aa2936f5 Takashi Iwai 2009-05-26 3434 mutex_unlock(&codec->bus->cmd_mutex); aa2936f5 Takashi Iwai 2009-05-26 3435 return 0; b3ac5636 Takashi Iwai 2007-08-10 3436 }

--- 0-DAY kernel build testing backend Open Source Technology Center Fengguang Wu, Yuanhan Liu Intel Corporation