X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fs390%2Fchar%2Ffs3270.c;h=d54d5025f84cbf005b2077b504810fc7ef2d19f0;hb=7172c64a7cee4dfa95864f49c914f7ea8cf497c8;hp=ef004d089712bc8a0420e204fc3d597fbfb05343;hpb=3967a72a825e44bff5d10f516e90b6f59f59e599;p=linux-2.6.git

diff --git a/drivers/s390/char/fs3270.c b/drivers/s390/char/fs3270.c
index ef004d089..d54d5025f 100644
--- a/drivers/s390/char/fs3270.c
+++ b/drivers/s390/char/fs3270.c
@@ -425,11 +425,15 @@ fs3270_open(struct inode *inode, struct file *filp)
 	minor = iminor(filp->f_dentry->d_inode);
 	/* Check for minor 0 multiplexer. */
 	if (minor == 0) {
-		if (!current->signal->tty)
+		struct tty_struct *tty;
+		mutex_lock(&tty_mutex);
+		tty = get_current_tty();
+		if (!tty || tty->driver->major != IBM_TTY3270_MAJOR) {
+			mutex_unlock(&tty_mutex);
 			return -ENODEV;
-		if (current->signal->tty->driver->major != IBM_TTY3270_MAJOR)
-			return -ENODEV;
-		minor = current->signal->tty->index + RAW3270_FIRSTMINOR;
+		}
+		minor = tty->index + RAW3270_FIRSTMINOR;
+		mutex_unlock(&tty_mutex);
 	}
 	/* Check if some other program is already using fullscreen mode. */
 	fp = (struct fs3270 *) raw3270_find_view(&fs3270_fn, minor);