[src/trunk]: src/sys/dev Restore the use of sc_intr_lock as it was in rev 1.334.

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

details:   https://anonhg.NetBSD.org/src/rev/28acc39006bc
branches:  trunk
changeset: 353610:28acc39006bc
user:      nat <nat%NetBSD.org@localhost>
date:      Sun May 14 10:08:49 2017 +0000

description:
Restore the use of sc_intr_lock as it was in rev 1.334.
The ring buffer pages are now wired so the use of the interrupt lock won't
cause panics.

Ok riastradh@.

diffstat:

 sys/dev/audio.c |  10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diffs (57 lines):

diff -r fd516189a816 -r 28acc39006bc sys/dev/audio.c
--- a/sys/dev/audio.c   Sun May 14 10:01:34 2017 +0000
+++ b/sys/dev/audio.c   Sun May 14 10:08:49 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: audio.c,v 1.344 2017/05/14 10:01:34 nat Exp $  */
+/*     $NetBSD: audio.c,v 1.345 2017/05/14 10:08:49 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 1.344 2017/05/14 10:01:34 nat Exp $");
+__KERNEL_RCSID(0, "$NetBSD: audio.c,v 1.345 2017/05/14 10:08:49 nat Exp $");
 
 #include "audio.h"
 #if NAUDIO > 0
@@ -3858,22 +3858,20 @@
        cc = blksize - (inp - cb->s.start) % blksize;
        if (sc->sc_writeme == false) {
                DPRINTFN(3, ("MIX RING EMPTY - INSERT SILENCE\n"));
-               mutex_exit(sc->sc_intr_lock);
                audio_fill_silence(&vc->sc_mpr.s.param, inp, cc);
-               mutex_enter(sc->sc_intr_lock);
                sc->sc_pr.drops += cc;
        } else
                cc = blksize;
        cb->s.inp = audio_stream_add_inp(&cb->s, cb->s.inp, cc);
        cc = blksize;
        cc1 = sc->sc_pr.s.end - sc->sc_pr.s.inp;
-       mutex_exit(sc->sc_intr_lock);
        if (cc1 < cc) {
                audio_fill_silence(&vc->sc_mpr.s.param, sc->sc_pr.s.inp, cc1);
                cc -= cc1;
                audio_fill_silence(&vc->sc_mpr.s.param, sc->sc_pr.s.start, cc);
        } else
                audio_fill_silence(&vc->sc_mpr.s.param, sc->sc_pr.s.inp, cc);
+       mutex_exit(sc->sc_intr_lock);
 
        kpreempt_disable();
        if (sc->schedule_wih == true)
@@ -3957,12 +3955,14 @@
                cc = blksize;
                if (cb->s.inp + blksize > cb->s.end)
                        cc = cb->s.end - cb->s.inp;
+               mutex_enter(sc->sc_intr_lock);
                memcpy(cb->s.inp, sc->sc_rr.s.start, cc);
                if (cc < blksize && cc != 0) {
                        cc1 = cc;
                        cc = blksize - cc;
                        memcpy(cb->s.start, sc->sc_rr.s.start + cc1, cc);
                }
+               mutex_exit(sc->sc_intr_lock);
 
                cc = blksize;
                recswvol_func(sc, cb, blksize, vc);