From: Martin Schwidefsky <schwidefsky@de.ibm.com>

In case of a non 3270 tty the mutex won't get freed.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 drivers/s390/char/fs3270.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff -puN drivers/s390/char/fs3270.c~tty-signal-tty-locking-3270-fix drivers/s390/char/fs3270.c
--- a/drivers/s390/char/fs3270.c~tty-signal-tty-locking-3270-fix
+++ a/drivers/s390/char/fs3270.c
@@ -427,10 +427,10 @@ fs3270_open(struct inode *inode, struct 
 		struct tty_struct *tty;
 		mutex_lock(&tty_mutex);
 		tty = get_current_tty();
-		if (!tty)
-			return -ENODEV;
-		if (tty->driver->major != IBM_TTY3270_MAJOR)
+		if (!tty || tty->driver->major != IBM_TTY3270_MAJOR) {
+			mutex_unlock(&tty_mutex);
 			return -ENODEV;
+		}
 		minor = tty->index + RAW3270_FIRSTMINOR;
 		mutex_unlock(&tty_mutex);
 	}
_