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ASoC: wm97xx: fix uninitialized regmap pointer problem

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[ Upstream commit 576ce4075b ]

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: 2ed1a8e0ce ("ASoC: wm9712: add ac97 new bus support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Arnd Bergmann 2018-11-02 16:18:21 +01:00 committed by Greg Kroah-Hartman
parent 9ee29cc7b9
commit e82db5bec1
4 changed files with 13 additions and 19 deletions
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2
include/sound/soc.h
View file

@ -548,12 +548,12 @@ 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);

10
sound/soc/codecs/wm9705.c
View file

@ -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 = {

10
sound/soc/codecs/wm9712.c
View file

@ -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 = {

10
sound/soc/codecs/wm9713.c
View file

@ -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 = {