Revert "ALSA: usb-audio: Fix potential zero-division at parsing FU"

The commit 8428a8ebde2d ("ALSA: usb-audio: Fix potential zero-division
at parsing FU") is utterly bogus and breaks the case with csize=1
instead of fixing anything.  Just take it back again.

Reported-by: Jörg Otte <jrg.otte@gmail.com>
Fixes: 8428a8ebde2d ("ALSA: usb-audio: Fix potential zero-division at parsing FU"
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 0537c63..61b3483 100644 (file)
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1476,9 +1476,9 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid,
                        return -EINVAL;
                }
                csize = hdr->bControlSize;
-               if (csize <= 1) {
+               if (!csize) {
                        usb_audio_dbg(state->chip,
-                                     "unit %u: invalid bControlSize <= 1\n",
+                                     "unit %u: invalid bControlSize == 0\n",
                                      unitid);
                        return -EINVAL;
                }