tree: https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git topic/dapm head: 19ad683abc8534cd755403381c73c0ddce7b9f6d commit: 19ad683abc8534cd755403381c73c0ddce7b9f6d [4/4] ASoC: dapm: Avoid creating kcontrol for params config: i386-randconfig-x079-201740 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: git checkout 19ad683abc8534cd755403381c73c0ddce7b9f6d # save the attached .config to linux build tree make ARCH=i386

Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

sound//soc/soc-dapm.c: In function 'snd_soc_dapm_new_pcm':

...

sound//soc/soc-dapm.c:3940:2: warning: 'w_param_text' may be used uninitialized in this function [-Wmaybe-uninitialized]

snd_soc_dapm_free_kcontrol(card, &private_value, num_params, w_param_text); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/w_param_text +3940 sound//soc/soc-dapm.c

3862 3863 int snd_soc_dapm_new_pcm(struct snd_soc_card *card, 3864 const struct snd_soc_pcm_stream *params, 3865 unsigned int num_params, 3866 struct snd_soc_dapm_widget *source, 3867 struct snd_soc_dapm_widget *sink) 3868 { 3869 struct snd_soc_dapm_widget template; 3870 struct snd_soc_dapm_widget *w; 3871 const char **w_param_text; 3872 unsigned long private_value; 3873 char *link_name; 3874 int ret; 3875 3876 link_name = devm_kasprintf(card->dev, GFP_KERNEL, "%s-%s", 3877 source->name, sink->name); 3878 if (!link_name) 3879 return -ENOMEM; 3880 3881 memset(&template, 0, sizeof(template)); 3882 template.reg = SND_SOC_NOPM; 3883 template.id = snd_soc_dapm_dai_link; 3884 template.name = link_name; 3885 template.event = snd_soc_dai_link_event; 3886 template.event_flags = SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMU | 3887 SND_SOC_DAPM_PRE_PMD; 3888 template.kcontrol_news = NULL; 3889 3890 /* allocate memory for control, only in case of multiple configs */ 3891 if (num_params > 1) { 3892 w_param_text = devm_kcalloc(card->dev, num_params, 3893 sizeof(char *), GFP_KERNEL); 3894 if (!w_param_text) { 3895 ret = -ENOMEM; 3896 goto param_fail; 3897 } 3898 3899 template.num_kcontrols = 1; 3900 template.kcontrol_news = 3901 snd_soc_dapm_alloc_kcontrol(card, 3902 link_name, params, num_params, 3903 w_param_text, &private_value); 3904 if (!template.kcontrol_news) { 3905 ret = -ENOMEM; 3906 goto param_fail; 3907 } 3908 } 3909 dev_dbg(card->dev, "ASoC: adding %s widget\n", link_name); 3910 3911 w = snd_soc_dapm_new_control_unlocked(&card->dapm, &template); 3912 if (IS_ERR(w)) { 3913 ret = PTR_ERR(w); 3914 /* Do not nag about probe deferrals */ 3915 if (ret != -EPROBE_DEFER) 3916 dev_err(card->dev, 3917 "ASoC: Failed to create %s widget (%d)\n", 3918 link_name, ret); 3919 goto outfree_kcontrol_news; 3920 } 3921 if (!w) { 3922 dev_err(card->dev, "ASoC: Failed to create %s widget\n", 3923 link_name); 3924 ret = -ENOMEM; 3925 goto outfree_kcontrol_news; 3926 } 3927 3928 w->params = params; 3929 w->num_params = num_params; 3930 3931 ret = snd_soc_dapm_add_path(&card->dapm, source, w, NULL, NULL); 3932 if (ret) 3933 goto outfree_w; 3934 return snd_soc_dapm_add_path(&card->dapm, w, sink, NULL, NULL); 3935 3936 outfree_w: 3937 devm_kfree(card->dev, w); 3938 outfree_kcontrol_news: 3939 devm_kfree(card->dev, (void *)template.kcontrol_news);

3940 snd_soc_dapm_free_kcontrol(card, &private_value, num_params, w_param_text);

3941 param_fail: 3942 devm_kfree(card->dev, link_name); 3943 return ret; 3944 } 3945

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