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Unverified Commit 576ce407 authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Mark Brown
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ASoC: wm97xx: fix uninitialized regmap pointer problem 



gcc notices that without either the ac97 bus or the pdata, we never
initialize the regmap pointer, which leads to an uninitialized variable
access:

sound/soc/codecs/wm9712.c: In function 'wm9712_soc_probe':
sound/soc/codecs/wm9712.c:666:2: error: 'regmap' may be used uninitialized in this function [-Werror=maybe-uninitialized]

Since that configuration is invalid, it's better to return an error
here. I tried to avoid adding complexity to the conditions, and turned
the #ifdef into a regular if(IS_ENABLED()) check for readability.
This in turn requires moving some header file declarations out of
an #ifdef.

The same code is used in three drivers, all of which I'm changing
the same way.

Fixes: 2ed1a8e0 ("ASoC: wm9712: add ac97 new bus support")
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent ff60005e

include/sound/soc.h

+1 −1
Original line number Diff line number Diff line
@@ -553,12 +553,12 @@ static inline void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count, 
}

#endif



#ifdef CONFIG_SND_SOC_AC97_BUS

struct snd_ac97 *snd_soc_alloc_ac97_component(struct snd_soc_component *component);

struct snd_ac97 *snd_soc_new_ac97_component(struct snd_soc_component *component,

	unsigned int id, unsigned int id_mask);

void snd_soc_free_ac97_component(struct snd_ac97 *ac97);



#ifdef CONFIG_SND_SOC_AC97_BUS

int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops);

int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops,

		struct platform_device *pdev);

sound/soc/codecs/wm9705.c

+4 −6
Original line number Diff line number Diff line
@@ -325,8 +325,7 @@ static int wm9705_soc_probe(struct snd_soc_component *component) 
	if (wm9705->mfd_pdata) {

		wm9705->ac97 = wm9705->mfd_pdata->ac97;

		regmap = wm9705->mfd_pdata->regmap;

	} else {

#ifdef CONFIG_SND_SOC_AC97_BUS

	} else if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS)) {

		wm9705->ac97 = snd_soc_new_ac97_component(component, WM9705_VENDOR_ID,

						      WM9705_VENDOR_ID_MASK);

		if (IS_ERR(wm9705->ac97)) {
@@ -339,7 +338,8 @@ static int wm9705_soc_probe(struct snd_soc_component *component) 
			snd_soc_free_ac97_component(wm9705->ac97);

			return PTR_ERR(regmap);

		}

#endif

	} else {

		return -ENXIO;

	}



	snd_soc_component_set_drvdata(component, wm9705->ac97);
@@ -350,14 +350,12 @@ static int wm9705_soc_probe(struct snd_soc_component *component) 


static void wm9705_soc_remove(struct snd_soc_component *component)

{

#ifdef CONFIG_SND_SOC_AC97_BUS

	struct wm9705_priv *wm9705 = snd_soc_component_get_drvdata(component);



	if (!wm9705->mfd_pdata) {

	if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS) && !wm9705->mfd_pdata) {

		snd_soc_component_exit_regmap(component);

		snd_soc_free_ac97_component(wm9705->ac97);

	}

#endif

}



static const struct snd_soc_component_driver soc_component_dev_wm9705 = {

sound/soc/codecs/wm9712.c

+4 −6
Original line number Diff line number Diff line
@@ -642,8 +642,7 @@ static int wm9712_soc_probe(struct snd_soc_component *component) 
	if (wm9712->mfd_pdata) {

		wm9712->ac97 = wm9712->mfd_pdata->ac97;

		regmap = wm9712->mfd_pdata->regmap;

	} else {

#ifdef CONFIG_SND_SOC_AC97_BUS

	} else if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS)) {

		int ret;



		wm9712->ac97 = snd_soc_new_ac97_component(component, WM9712_VENDOR_ID,
@@ -660,7 +659,8 @@ static int wm9712_soc_probe(struct snd_soc_component *component) 
			snd_soc_free_ac97_component(wm9712->ac97);

			return PTR_ERR(regmap);

		}

#endif

	} else {

		return -ENXIO;

	}



	snd_soc_component_init_regmap(component, regmap);
@@ -673,14 +673,12 @@ static int wm9712_soc_probe(struct snd_soc_component *component) 


static void wm9712_soc_remove(struct snd_soc_component *component)

{

#ifdef CONFIG_SND_SOC_AC97_BUS

	struct wm9712_priv *wm9712 = snd_soc_component_get_drvdata(component);



	if (!wm9712->mfd_pdata) {

	if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS) && !wm9712->mfd_pdata) {

		snd_soc_component_exit_regmap(component);

		snd_soc_free_ac97_component(wm9712->ac97);

	}

#endif

}



static const struct snd_soc_component_driver soc_component_dev_wm9712 = {

sound/soc/codecs/wm9713.c

+4 −6
Original line number Diff line number Diff line
@@ -1214,8 +1214,7 @@ static int wm9713_soc_probe(struct snd_soc_component *component) 
	if (wm9713->mfd_pdata) {

		wm9713->ac97 = wm9713->mfd_pdata->ac97;

		regmap = wm9713->mfd_pdata->regmap;

	} else {

#ifdef CONFIG_SND_SOC_AC97_BUS

	} else if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS)) {

		wm9713->ac97 = snd_soc_new_ac97_component(component, WM9713_VENDOR_ID,

						      WM9713_VENDOR_ID_MASK);

		if (IS_ERR(wm9713->ac97))
@@ -1225,7 +1224,8 @@ static int wm9713_soc_probe(struct snd_soc_component *component) 
			snd_soc_free_ac97_component(wm9713->ac97);

			return PTR_ERR(regmap);

		}

#endif

	} else {

		return -ENXIO;

	}



	snd_soc_component_init_regmap(component, regmap);
@@ -1238,14 +1238,12 @@ static int wm9713_soc_probe(struct snd_soc_component *component) 


static void wm9713_soc_remove(struct snd_soc_component *component)

{

#ifdef CONFIG_SND_SOC_AC97_BUS

	struct wm9713_priv *wm9713 = snd_soc_component_get_drvdata(component);



	if (!wm9713->mfd_pdata) {

	if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS) && !wm9713->mfd_pdata) {

		snd_soc_component_exit_regmap(component);

		snd_soc_free_ac97_component(wm9713->ac97);

	}

#endif

}



static const struct snd_soc_component_driver soc_component_dev_wm9713 = {