From b98ae9ad559fea64dee5fcc8e3ba4bf936ceb5e6 Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Mon, 15 May 2017 10:33:59 +0200
Subject: [PATCH] ASoC: rt5665: Fix uninitialized warning in rt5665_i2s_pin_event()
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Git-commit: b98ae9ad559fea64dee5fcc8e3ba4bf936ceb5e6
Patch-mainline: v4.13-rc1
References: bsc#1051510

With gcc 4.1.2:

    sound/soc/codecs/rt5665.c: In function ‘rt5665_i2s_pin_event’:
    sound/soc/codecs/rt5665.c:2610: warning: ‘mask1’ may be used uninitialized in this function
    sound/soc/codecs/rt5665.c:2610: warning: ‘val2’ may be used uninitialized in this function
    sound/soc/codecs/rt5665.c:2610: warning: ‘val1’ may be used uninitialized in this function

The first one is currently a false positive, as rt5665_i2s_pin_event()
is never called with snd_soc_dapm_widget.shift set to a value not
handled by the switch() statement.  But that may change, so
preinitialize mask1 to fix this, like is already done for mask2.

The last two are false-positives, the compiler is just not smart enough
to notice the mask and val variables are always used together.

Fixes: 9b5d3865b3b410d2 ("ASoC: rt5665: set i2s pin share configuration")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 sound/soc/codecs/rt5665.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

--- a/sound/soc/codecs/rt5665.c
+++ b/sound/soc/codecs/rt5665.c
@@ -2607,7 +2607,7 @@ static int rt5665_i2s_pin_event(struct s
 	struct snd_kcontrol *kcontrol, int event)
 {
 	struct snd_soc_codec *codec = snd_soc_dapm_to_codec(w->dapm);
-	unsigned int val1, val2, mask1, mask2 = 0;
+	unsigned int val1, val2, mask1 = 0, mask2 = 0;
 
 	switch (w->shift) {
 	case RT5665_PWR_I2S2_1_BIT:
@@ -2635,13 +2635,17 @@ static int rt5665_i2s_pin_event(struct s
 	}
 	switch (event) {
 	case SND_SOC_DAPM_PRE_PMU:
-		snd_soc_update_bits(codec, RT5665_GPIO_CTRL_1, mask1, val1);
+		if (mask1)
+			snd_soc_update_bits(codec, RT5665_GPIO_CTRL_1,
+					    mask1, val1);
 		if (mask2)
 			snd_soc_update_bits(codec, RT5665_GPIO_CTRL_2,
 					    mask2, val2);
 		break;
 	case SND_SOC_DAPM_POST_PMD:
-		snd_soc_update_bits(codec, RT5665_GPIO_CTRL_1, mask1, 0);
+		if (mask1)
+			snd_soc_update_bits(codec, RT5665_GPIO_CTRL_1,
+					    mask1, 0);
 		if (mask2)
 			snd_soc_update_bits(codec, RT5665_GPIO_CTRL_2,
 					    mask2, 0);