Fixed a deadlock in xencons_close().

patches.fixes/xencons_close_deadlock.patch

@@ -0,0 +1,15 @@
+--- linux-2.6.38.3/drivers/xen/console/console.c.orig	2011-07-21 13:20:34.120001602 +0200
++++ linux-2.6.38.3/drivers/xen/console/console.c	2011-07-21 13:36:14.848001956 +0200
+@@ -618,7 +618,12 @@ static void xencons_close(struct tty_str
+ 	if (DUMMY_TTY(tty))
+ 		return;
+ 
++	/* We are called under tty_lock(). As other functions in tty core
++	obtain locks in tty_mutex,tty_lock order, we must do the same to
++	avoid a deadlock. Thus we must first tty_unlock(), and then lock. */
++	tty_unlock();
+ 	mutex_lock(&tty_mutex);
++	tty_lock();
+ 
+ 	if (tty->count != 1) {
+ 		mutex_unlock(&tty_mutex);

series.conf

@@ -845,3 +845,4 @@
 
 	patches.qubes/nuke_balloon_minimum_target.patch
 	patches.fixes/xen-blkfront-connect-overflow.patch
+	patches.fixes/xencons_close_deadlock.patch