[patch v2] sound/usb/format: silence uninitialized variable

Dan Carpenter
2010-08-14T17:29:53Z

Gcc complains that ret might be used uninitialized:

sound/usb/format.c: In function ‘snd_usb_parse_audio_format’:
sound/usb/format.c:354: warning: ‘ret’ may be used uninitialized in this function
sound/usb/format.c:354: note: ‘ret’ was declared here
sound/usb/format.c:414: warning: ‘ret’ may be used uninitialized in this function
sound/usb/format.c:414: note: ‘ret’ was declared here

I suppose it could be uninitialized if there is ever a UAC_VERSION_3
released. Anyway this patch is worthwhile if only to silence the gcc
warning.

Signed-off-by: Dan Carpenter <error27@gmail.com>
---
V2: Totally different. Added printk()s

diff --git a/sound/usb/format.c b/sound/usb/format.c
index 4387f54..3a13754 100644
--- a/sound/usb/format.c
+++ b/sound/usb/format.c
@@ -392,6 +392,10 @@ static int parse_audio_format_i(struct snd_usb_audio *chip,
/* fp->channels is already set in this case */
ret = parse_audio_format_rates_v2(chip, fp);
break;
+ default:
+ snd_printk(KERN_ERR "%d:%u:%d : invalid protocol version %d\n",
+ chip->dev->devnum, fp->iface, fp->altsetting, protocol);
+ return -EINVAL;
}

if (fp->channels < 1) {
@@ -452,6 +456,10 @@ static int parse_audio_format_ii(struct snd_usb_audio *chip,
ret = parse_audio_format_rates_v2(chip, fp);
break;
}
+ default:
+ snd_printk(KERN_ERR "%d:%u:%d : invalid protocol version %d\n",
+ chip->dev->devnum, fp->iface, fp->altsetting, protocol);
+ return -EINVAL;
}

return ret;