PERFORCE change 152090 for review

[Ed Schouten]

http://perforce.freebsd.org/chv.cgi?CH=152090

Change 152090 by ed at ed_dull on 2008/10/28 10:51:10

	It turns out we have console devices on our system that may have
	no TTY associated with them. Don't panic when our primary
	console device has no TTY associated.

Affected files ...

.. //depot/projects/mpsafetty/sys/kern/tty.c#62 edit

Differences ...

==== //depot/projects/mpsafetty/sys/kern/tty.c#62 (text+ko) ====

@@ -1769,8 +1769,9 @@
 	}
 	sx_sunlock(&tty_list_sx);
 
+	/* System console has no TTY associated. */
 	if (dev_console->si_drv1 == NULL)
-		panic("Device driver uses name of nonexistent TTY");
+		return (ENXIO);
 	
 	return (ttydev_open(dev, oflags, devtype, td));
 }