From: Thomas Reitmayr <thomas@devbase.at>
Date: Tue, 15 May 2007 09:47:48 +0000 (+0200)
Subject: [ALSA] usbaudio - Coping with short replies in usbmixer
X-Git-Tag: v2.6.22-rc2~65^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a04395ead6d17c83da64264b6fe78f852a648202;p=platform%2Fkernel%2Flinux-stable.git

[ALSA] usbaudio - Coping with short replies in usbmixer

This patch makes sure that short USB replies are treated as an
error when requesting the value of a certain mixer control.

Signed-off-by: Thomas Reitmayr <thomas@devbase.at>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
---

diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index 7b3bf35..325d4b6 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -360,7 +360,7 @@ static int get_ctl_value(struct usb_mixer_elem_info *cval, int request, int vali
 				    request,
 				    USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 				    validx, cval->mixer->ctrlif | (cval->id << 8),
-				    buf, val_len, 100) >= 0) {
+				    buf, val_len, 100) >= val_len) {
 			*value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
 			return 0;
 		}