[src/trunk]: src/sys/dev Plug memory leak as the mixer state does not grow or...

[nat <nat%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d823418a3ea5
branches:  trunk
changeset: 357548:d823418a3ea5
user:      nat <nat%NetBSD.org@localhost>
date:      Wed Nov 15 01:49:59 2017 +0000

description:
Plug memory leak as the mixer state does not grow or shrink when audio
mixing is disabled.  This avoids triggering a panic also.

diffstat:

 sys/dev/audio.c |  7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diffs (28 lines):

diff -r 4518011e377b -r d823418a3ea5 sys/dev/audio.c
--- a/sys/dev/audio.c   Wed Nov 15 01:45:57 2017 +0000
+++ b/sys/dev/audio.c   Wed Nov 15 01:49:59 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: audio.c,v 1.432 2017/11/15 01:45:57 nat Exp $  */
+/*     $NetBSD: audio.c,v 1.433 2017/11/15 01:49:59 nat Exp $  */
 
 /*-
  * Copyright (c) 2016 Nathanial Sloss <nathanialsloss%yahoo.com.au@localhost>
@@ -148,7 +148,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: audio.c,v 1.432 2017/11/15 01:45:57 nat Exp $");
+__KERNEL_RCSID(0, "$NetBSD: audio.c,v 1.433 2017/11/15 01:49:59 nat Exp $");
 
 #ifdef _KERNEL_OPT
 #include "audio.h"
@@ -2310,7 +2310,8 @@
 
        DPRINTF(("audio_open: done sc_mode = 0x%x\n", vc->sc_mode));
 
-       grow_mixer_states(sc, 2);
+       if (sc->sc_usemixer)
+               grow_mixer_states(sc, 2);
        if (flags & FREAD)
                sc->sc_recopens++;
        if (flags & FWRITE)