[PATCH] ALSA: emu10k1: fix error handling in snd_audigy_i2c_volume_put()

[Oswald Buddenhagen <oswald.buddenhagen@xxxxxx>]

Check all inputs before changing anything, and return the right error
code in case of failure.

Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@xxxxxx>
---
 sound/pci/emu10k1/emumixer.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/sound/pci/emu10k1/emumixer.c b/sound/pci/emu10k1/emumixer.c
index 754d91050af2..2b1afbef92c7 100644
--- a/sound/pci/emu10k1/emumixer.c
+++ b/sound/pci/emu10k1/emumixer.c
@@ -1005,33 +1005,33 @@ static int snd_audigy_i2c_volume_put(struct snd_kcontrol *kcontrol,
 {
 	struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
 	unsigned int ogain;
-	unsigned int ngain;
+	unsigned int ngain0, ngain1;
 	unsigned int source_id;
 	int change = 0;
 
 	source_id = kcontrol->private_value;
 	/* Limit: emu->i2c_capture_volume */
         /*        capture_source: uinfo->value.enumerated.items = 2 */
 	if (source_id >= 2)
 		return -EINVAL;
+	ngain0 = ucontrol->value.integer.value[0];
+	ngain1 = ucontrol->value.integer.value[1];
+	if (ngain0 > 0xff)
+		return -EINVAL;
+	if (ngain1 > 0xff)
+		return -EINVAL;
 	ogain = emu->i2c_capture_volume[source_id][0]; /* Left */
-	ngain = ucontrol->value.integer.value[0];
-	if (ngain > 0xff)
-		return 0;
-	if (ogain != ngain) {
+	if (ogain != ngain0) {
 		if (emu->i2c_capture_source == source_id)
-			snd_emu10k1_i2c_write(emu, ADC_ATTEN_ADCL, ((ngain) & 0xff) );
-		emu->i2c_capture_volume[source_id][0] = ngain;
+			snd_emu10k1_i2c_write(emu, ADC_ATTEN_ADCL, ngain0);
+		emu->i2c_capture_volume[source_id][0] = ngain0;
 		change = 1;
 	}
 	ogain = emu->i2c_capture_volume[source_id][1]; /* Right */
-	ngain = ucontrol->value.integer.value[1];
-	if (ngain > 0xff)
-		return 0;
-	if (ogain != ngain) {
+	if (ogain != ngain1) {
 		if (emu->i2c_capture_source == source_id)
-			snd_emu10k1_i2c_write(emu, ADC_ATTEN_ADCR, ((ngain) & 0xff));
-		emu->i2c_capture_volume[source_id][1] = ngain;
+			snd_emu10k1_i2c_write(emu, ADC_ATTEN_ADCR, ngain1);
+		emu->i2c_capture_volume[source_id][1] = ngain1;
 		change = 1;
 	}
 
-- 
2.40.0.152.g15d061e6df