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diff --git a/sys/dev/sound/midi/midi.c b/sys/dev/sound/midi/midi.c
--- a/sys/dev/sound/midi/midi.c
+++ b/sys/dev/sound/midi/midi.c
@@ -391,9 +391,11 @@
used = MIN(used, MIDI_RSIZE);
MIDIQ_DEQ(m->inq, buf, used);
+ mtx_unlock(&m->lock);
retval = uiomove(buf, used, uio);
if (retval)
- goto err1;
+ goto err0;
+ mtx_lock(&m->lock);
}
/*
@@ -457,9 +459,11 @@
used = MIN(MIDIQ_AVAIL(m->outq), uio->uio_resid);
used = MIN(used, MIDI_WSIZE);
+ mtx_unlock(&m->lock);
retval = uiomove(buf, used, uio);
if (retval)
- goto err1;
+ goto err0;
+ mtx_lock(&m->lock);
MIDIQ_ENQ(m->outq, buf, used);
/*
* Inform the bottom half that data can be written

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