[src/trunk]: src/sys/dev catch attachment fault sooner.

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

details:   https://anonhg.NetBSD.org/src/rev/886e002fdc41
branches:  trunk
changeset: 349628:886e002fdc41
user:      christos <christos%NetBSD.org@localhost>
date:      Fri Dec 16 22:03:10 2016 +0000

description:
catch attachment fault sooner.

diffstat:

 sys/dev/audio.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r 52e6d9c411d7 -r 886e002fdc41 sys/dev/audio.c
--- a/sys/dev/audio.c   Fri Dec 16 20:16:50 2016 +0000
+++ b/sys/dev/audio.c   Fri Dec 16 22:03:10 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: audio.c,v 1.280 2016/12/16 16:03:28 christos Exp $     */
+/*     $NetBSD: audio.c,v 1.281 2016/12/16 22:03:10 christos 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 1.280 2016/12/16 16:03:28 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: audio.c,v 1.281 2016/12/16 22:03:10 christos Exp $");
 
 #include "audio.h"
 #if NAUDIO > 0
@@ -1432,7 +1432,7 @@
 
        /* First, find the device and take sc_lock. */
        sc = device_lookup_private(&audio_cd, AUDIOUNIT(dev));
-       if (sc == NULL)
+       if (sc == NULL || sc->hw_if)
                return ENXIO;
        mutex_enter(sc->sc_lock);
        if (sc->sc_dying) {