D57442.id179602.diff
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D57442.id179602.diff
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	diff --git a/sys/dev/vt/vt_buf.c b/sys/dev/vt/vt_buf.c
	--- a/sys/dev/vt/vt_buf.c
	+++ b/sys/dev/vt/vt_buf.c
	@@ -45,6 +45,7 @@

	#define VTBUF_LOCK(vb) mtx_lock_spin(&(vb)->vb_lock)
	#define VTBUF_UNLOCK(vb) mtx_unlock_spin(&(vb)->vb_lock)
	+#define VTBUF_LOCK_OWNED(vb) mtx_owned(&(vb)->vb_lock)

	#define POS_INDEX(c, r) (((r) << 12) + (c))
	#define POS_COPY(d, s) do { \
	@@ -741,9 +742,19 @@
	area.tr_end.tp_col = vb->vb_scr_size.tp_col;
	area.tr_end.tp_row = MAX(s, e) + 1;

	- VTBUF_LOCK(vb);
	- vtbuf_dirty(vb, &area);
	- VTBUF_UNLOCK(vb);
	+ /*
	+ * If the request originates from a keyboard, the vtbuf is
	+ * locked by teken for the entire duration of the request.
	+ * For all other sources, we avoid holding the spinlock for
	+ * extended periods.
	+ */
	+ if (VTBUF_LOCK_OWNED(vb)) {
	+ vtbuf_dirty(vb, &area);
	+ } else {
	+ VTBUF_LOCK(vb);
	+ vtbuf_dirty(vb, &area);
	+ VTBUF_UNLOCK(vb);
	+ }
	}
	}