Hello Shengjiu Wang,

Commit 039652a5b965 ("ASoC: fsl-asoc-card: Add MQS support") from Jun 17, 2020 (linux-next), leads to the following Smatch static checker warning:

sound/soc/fsl/fsl-asoc-card.c:796 fsl_asoc_card_probe() error: uninitialized symbol 'codec_dev_name'.

sound/soc/fsl/fsl-asoc-card.c 542 static int fsl_asoc_card_probe(struct platform_device *pdev) 543 { 544 struct device_node *cpu_np, *codec_np, *asrc_np; 545 struct device_node *np = pdev->dev.of_node; 546 struct platform_device *asrc_pdev = NULL; 547 struct device_node *bitclkprovider = NULL; 548 struct device_node *frameprovider = NULL; 549 struct platform_device *cpu_pdev; 550 struct fsl_asoc_card_priv *priv; 551 struct device *codec_dev = NULL; 552 const char *codec_dai_name; 553 const char *codec_dev_name; 554 u32 asrc_fmt = 0; 555 u32 width; 556 int ret; 557 558 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 559 if (!priv) 560 return -ENOMEM; 561 562 cpu_np = of_parse_phandle(np, "audio-cpu", 0); 563 /* Give a chance to old DT binding */ 564 if (!cpu_np) 565 cpu_np = of_parse_phandle(np, "ssi-controller", 0); 566 if (!cpu_np) { 567 dev_err(&pdev->dev, "CPU phandle missing or invalid\n"); 568 ret = -EINVAL; 569 goto fail; 570 } 571 572 cpu_pdev = of_find_device_by_node(cpu_np); 573 if (!cpu_pdev) { 574 dev_err(&pdev->dev, "failed to find CPU DAI device\n"); 575 ret = -EINVAL; 576 goto fail; 577 } 578 579 codec_np = of_parse_phandle(np, "audio-codec", 0); 580 if (codec_np) { 581 struct platform_device *codec_pdev; 582 struct i2c_client *codec_i2c; 583 584 codec_i2c = of_find_i2c_device_by_node(codec_np); 585 if (codec_i2c) { 586 codec_dev = &codec_i2c->dev; 587 codec_dev_name = codec_i2c->name; 588 } 589 if (!codec_dev) { 590 codec_pdev = of_find_device_by_node(codec_np); 591 if (codec_pdev) { 592 codec_dev = &codec_pdev->dev; 593 codec_dev_name = codec_pdev->name; 594 } 595 }

There are a bunch of ways that codec_dev_name can end up uninitialized.

596 } 597 598 asrc_np = of_parse_phandle(np, "audio-asrc", 0); 599 if (asrc_np) 600 asrc_pdev = of_find_device_by_node(asrc_np); 601 602 /* Get the MCLK rate only, and leave it controlled by CODEC drivers */ 603 if (codec_dev) { 604 struct clk *codec_clk = clk_get(codec_dev, NULL); 605

[ Snip ]

789 /* Initialize sound card */ 790 priv->pdev = pdev; 791 priv->card.dev = &pdev->dev; 792 priv->card.owner = THIS_MODULE; 793 ret = snd_soc_of_parse_card_name(&priv->card, "model"); 794 if (ret) { 795 snprintf(priv->name, sizeof(priv->name), "%s-audio", --> 796 fsl_asoc_card_is_ac97(priv) ? "ac97" : codec_dev_name);

Used in error handling only.

797 priv->card.name = priv->name; 798 } 799 priv->card.dai_link = priv->dai_link; 800 priv->card.late_probe = fsl_asoc_card_late_probe;

regards, dan carpenter