Hi dan,

You are right, snd_soc_of_get_dai_name() can fail, we should check its return value.

I noticed that Kuninori Morimoto's patch removed this part of code. please refer to link: https://lore.kernel.org/alsa-devel/87352ndmlq.wl-kuninori.morimoto.gx@renesa...

As broonie's comments, the patch will be merged soon. If the patch is not merged in the end, i will add a new patch to fix.

Thanks, Yingkun

On 2023/6/19 17:45, Dan Carpenter wrote:

Hello Yingkun Meng,

The patch d24028606e76: "ASoC: loongson: Add Loongson ASoC Sound Card Support" from Jun 14, 2023, leads to the following Smatch static checker warning:

sound/soc/loongson/loongson_card.c:157 loongson_card_parse_of() error: uninitialized symbol 'cpu_dai_name'.

sound/soc/loongson/loongson_card.c:158 loongson_card_parse_of() error: uninitialized symbol 'codec_dai_name'.

sound/soc/loongson/loongson_card.c 115 static int loongson_card_parse_of(struct loongson_card_data *data) 116 { 117 const char *cpu_dai_name, *codec_dai_name; 118 struct device_node *cpu, *codec; 119 struct snd_soc_card *card = &data->snd_card; 120 struct device *dev = card->dev; 121 struct of_phandle_args args; 122 int ret, i; 123 124 cpu = of_get_child_by_name(dev->of_node, "cpu"); 125 if (!cpu) { 126 dev_err(dev, "platform property missing or invalid\n"); 127 return -EINVAL; 128 } 129 codec = of_get_child_by_name(dev->of_node, "codec"); 130 if (!codec) { 131 dev_err(dev, "audio-codec property missing or invalid\n"); 132 ret = -EINVAL; 133 goto err; 134 } 135 136 ret = of_parse_phandle_with_args(cpu, "sound-dai", 137 "#sound-dai-cells", 0, &args); 138 if (ret) { 139 dev_err(dev, "codec node missing #sound-dai-cells\n"); 140 goto err; 141 } 142 for (i = 0; i < card->num_links; i++) 143 loongson_dai_links[i].cpus->of_node = args.np; 144 145 ret = of_parse_phandle_with_args(codec, "sound-dai", 146 "#sound-dai-cells", 0, &args); 147 if (ret) { 148 dev_err(dev, "codec node missing #sound-dai-cells\n"); 149 goto err; 150 } 151 for (i = 0; i < card->num_links; i++) 152 loongson_dai_links[i].codecs->of_node = args.np; 153 154 snd_soc_of_get_dai_name(cpu, &cpu_dai_name); 155 snd_soc_of_get_dai_name(codec, &codec_dai_name);

It looks like snd_soc_of_get_dai_name() can fail but I can add an exception for that if it never fails in real life.

 156         for (i = 0; i < card->num_links; i++) {

--> 157 loongson_dai_links[i].cpus->dai_name = cpu_dai_name; 158 loongson_dai_links[i].codecs->dai_name = codec_dai_name; 159 } 160 of_node_put(cpu); 161 of_node_put(codec); 162 163 return 0; 164 165 err: 166 of_node_put(cpu); 167 of_node_put(codec); 168 return ret; 169 }

regards, dan carpenter