Re: [PATCH v2 5/5] ASoC: codecs: Add WCD939x Codec driver

[Dan Carpenter]

Hi Neil,

kernel test robot noticed the following build warnings:

https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Neil-Armstrong/ASoC-dt-bindings-document-WCD939x-Audio-Codec/20231202-000916
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
patch link:    https://lore.kernel.org/r/20231201-topic-sm8650-upstream-wcd939x-codec-v2-5-94ed814b25aa%40linaro.org
patch subject: [PATCH v2 5/5] ASoC: codecs: Add WCD939x Codec driver
config: powerpc64-randconfig-r081-20231204 (https://download.01.org/0day-ci/archive/20231206/202312060127.FLhplIP3-lkp@xxxxxxxxx/config)
compiler: powerpc64-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231206/202312060127.FLhplIP3-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
| Closes: https://lore.kernel.org/r/202312060127.FLhplIP3-lkp@xxxxxxxxx/

New smatch warnings:
sound/soc/codecs/wcd939x.c:3168 wcd939x_typec_mux_set() error: 'wcd939x' dereferencing possible ERR_PTR()
sound/soc/codecs/wcd939x.c:3221 wcd939x_swap_gnd_mic() warn: signedness bug returning '(-22)'

Old smatch warnings:
sound/soc/codecs/wcd939x.c:3170 wcd939x_typec_mux_set() error: 'wcd939x' dereferencing possible ERR_PTR()
sound/soc/codecs/wcd939x.c:3173 wcd939x_typec_mux_set() error: 'wcd939x' dereferencing possible ERR_PTR()
sound/soc/codecs/wcd939x.c:3174 wcd939x_typec_mux_set() error: 'wcd939x' dereferencing possible ERR_PTR()
sound/soc/codecs/wcd939x.c:3176 wcd939x_typec_mux_set() error: 'wcd939x' dereferencing possible ERR_PTR()
sound/soc/codecs/wcd939x.c:3177 wcd939x_typec_mux_set() error: 'wcd939x' dereferencing possible ERR_PTR()
sound/soc/codecs/wcd939x.c:3179 wcd939x_typec_mux_set() error: 'wcd939x' dereferencing possible ERR_PTR()

vim +/wcd939x +3168 sound/soc/codecs/wcd939x.c

6c302e2f95b1d1 Neil Armstrong 2023-12-01  3164  static int wcd939x_typec_mux_set(struct typec_mux_dev *mux,
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3165  				 struct typec_mux_state *state)
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3166  {
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3167  	struct wcd939x_priv *wcd939x = typec_mux_get_drvdata(mux);
6c302e2f95b1d1 Neil Armstrong 2023-12-01 @3168  	unsigned int previous_mode = wcd939x->typec_mode;

The Kconfig should probably depend on CONFIG_TYPEC to avoid a crash here.

6c302e2f95b1d1 Neil Armstrong 2023-12-01  3169  
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3170  	if (!wcd939x->wcd_mbhc)
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3171  		return -EINVAL;
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3172  
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3173  	if (wcd939x->typec_mode != state->mode) {
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3174  		wcd939x->typec_mode = state->mode;
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3175  
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3176  		if (wcd939x->typec_mode == TYPEC_MODE_AUDIO)
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3177  			return wcd_mbhc_typec_report_plug(wcd939x->wcd_mbhc);
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3178  		else if (previous_mode == TYPEC_MODE_AUDIO)
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3179  			return wcd_mbhc_typec_report_unplug(wcd939x->wcd_mbhc);
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3180  	}
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3181  
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3182  	return 0;
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3183  }

[ snip ]

6c302e2f95b1d1 Neil Armstrong 2023-12-01  3216  static bool wcd939x_swap_gnd_mic(struct snd_soc_component *component, bool active)
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3217  {
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3218  	struct wcd939x_priv *wcd939x = snd_soc_component_get_drvdata(component);
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3219  
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3220  	if (!wcd939x->typec_analog_mux || !wcd939x->typec_switch)
6c302e2f95b1d1 Neil Armstrong 2023-12-01 @3221  		return -EINVAL;

This is type bool.  return false?

6c302e2f95b1d1 Neil Armstrong 2023-12-01  3222  
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3223  	/* Report inversion via Type Switch of USBSS */
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3224  	return typec_switch_set(wcd939x->typec_switch,
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3225  				wcd939x->typec_orientation == TYPEC_ORIENTATION_REVERSE ?
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3226  					TYPEC_ORIENTATION_NORMAL : TYPEC_ORIENTATION_REVERSE);
6c302e2f95b1d1 Neil Armstrong 2023-12-01  3227  }

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