ALSA: atmel/ac97c: correct the unexpected behavior when using uninitial value for...

When pdata->reset_pin is passed with a negative value (means gpio
is invalid), then chip->reset_pin will not be assigned to a vaule,
it will use default value 0. This will cause unexpected behavior.

So, add this patch to correct.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/atmel/ac97c.c b/sound/atmel/ac97c.c
index 115313e..f5ded64 100644 (file)
--- a/sound/atmel/ac97c.c
+++ b/sound/atmel/ac97c.c
@@ -991,6 +991,8 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
                        gpio_direction_output(pdata->reset_pin, 1);
                        chip->reset_pin = pdata->reset_pin;
                }
+       } else {
+               chip->reset_pin = -EINVAL;
        }
 
        snd_card_set_dev(card, &pdev->dev);