[Midnightbsd-cvs] src: sound/pcm: rework the pcm lock/unlock logic

[laffer1 at midnightbsd.org]

Log Message:
-----------
rework the pcm lock/unlock logic

Modified Files:
--------------
    src/sys/dev/sound/pcm:
        channel.c (r1.4 -> r1.5)
        (http://cvsweb.midnightbsd.org/src/sys/dev/sound/pcm/channel.c?r1=1.4&r2=1.5)
        dsp.c (r1.5 -> r1.6)
        (http://cvsweb.midnightbsd.org/src/sys/dev/sound/pcm/dsp.c?r1=1.5&r2=1.6)
        mixer.c (r1.4 -> r1.5)
        (http://cvsweb.midnightbsd.org/src/sys/dev/sound/pcm/mixer.c?r1=1.4&r2=1.5)
        sound.c (r1.4 -> r1.5)
        (http://cvsweb.midnightbsd.org/src/sys/dev/sound/pcm/sound.c?r1=1.4&r2=1.5)
        sound.h (r1.4 -> r1.5)
        (http://cvsweb.midnightbsd.org/src/sys/dev/sound/pcm/sound.h?r1=1.4&r2=1.5)
        vchan.c (r1.4 -> r1.5)
        (http://cvsweb.midnightbsd.org/src/sys/dev/sound/pcm/vchan.c?r1=1.4&r2=1.5)