[src/trunk]: src/sys/dev Avoid crashes in calcwater when audioattach did not ...

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

details:   https://anonhg.NetBSD.org/src/rev/76d643151ba9
branches:  trunk
changeset: 349423:76d643151ba9
user:      martin <martin%NetBSD.org@localhost>
date:      Sat Dec 10 17:31:33 2016 +0000

description:
Avoid crashes in calcwater when audioattach did not fully complete

diffstat:

 sys/dev/audio.c |  8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diffs (36 lines):

diff -r 4d1ea2bd95de -r 76d643151ba9 sys/dev/audio.c
--- a/sys/dev/audio.c   Sat Dec 10 17:01:08 2016 +0000
+++ b/sys/dev/audio.c   Sat Dec 10 17:31:33 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: audio.c,v 1.273 2016/12/10 17:01:08 maya Exp $ */
+/*     $NetBSD: audio.c,v 1.274 2016/12/10 17:31:33 martin 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 1.273 2016/12/10 17:01:08 maya Exp $");
+__KERNEL_RCSID(0, "$NetBSD: audio.c,v 1.274 2016/12/10 17:31:33 martin Exp $");
 
 #include "audio.h"
 #if NAUDIO > 0
@@ -1809,7 +1809,7 @@
        struct virtual_channel *vc = sc->sc_vchan[n];
 
        /* set high at 100% */
-       if (audio_can_playback(sc)) {
+       if (audio_can_playback(sc) && vc && vc->sc_pustream) {
                vc->sc_mpr.usedhigh =
                    vc->sc_pustream->end - vc->sc_pustream->start;
                /* set low at 75% of usedhigh */
@@ -1818,7 +1818,7 @@
                        vc->sc_mpr.usedlow -= vc->sc_mpr.blksize;
        }
 
-       if (audio_can_capture(sc)) {
+       if (audio_can_capture(sc) && vc && vc->sc_rustream) {
                vc->sc_mrr.usedhigh =
                    vc->sc_rustream->end - vc->sc_rustream->start -
                    vc->sc_mrr.blksize;