kernel - Do not back out critical section for exchange_scr() call

* The critical section may be protecting a spinlock and cannot be safely
  backed out when calling exchange_scr().

* Fixes a panic.

Reported-by: rob

diff --git a/sys/dev/misc/syscons/syscons.c b/sys/dev/misc/syscons/syscons.c
index 20a779f..982cead 100644 (file)
--- a/sys/dev/misc/syscons/syscons.c
+++ b/sys/dev/misc/syscons/syscons.c
@@ -2540,9 +2540,7 @@ do_switch_scr(sc_softc_t *sc)
     lwkt_gettoken(&tty_token);
     vt_proc_alive(sc->new_scp);
 
-    crit_exit();
     exchange_scr(sc);
-    crit_enter();
     /* sc->cur_scp == sc->new_scp */
     wakeup((caddr_t)&sc->cur_scp->smode);