TTY: n_tty, simplify read_buf+echo_buf allocation

ldisc->open and close are called only once and cannot cross. So the
tests in open and close are superfluous. Remove them. (But leave sets
to NULL to ensure there is not a bug somewhere.)

And when the tests are gone, handle properly failures in open. We
leaked read_buf if allocation of echo_buf failed before. Now this is
not the case anymore.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/n_tty.c

@@ -1561,14 +1561,10 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
 static void n_tty_close(struct tty_struct *tty)
 {
 	n_tty_flush_buffer(tty);
-	if (tty->read_buf) {
-		kfree(tty->read_buf);
-		tty->read_buf = NULL;
-	}
-	if (tty->echo_buf) {
-		kfree(tty->echo_buf);
-		tty->echo_buf = NULL;
-	}
+	kfree(tty->read_buf);
+	kfree(tty->echo_buf);
+	tty->read_buf = NULL;
+	tty->echo_buf = NULL;
 }
 
 /**
@@ -1587,17 +1583,11 @@ static int n_tty_open(struct tty_struct *tty)
 		return -EINVAL;
 
 	/* These are ugly. Currently a malloc failure here can panic */
-	if (!tty->read_buf) {
-		tty->read_buf = kzalloc(N_TTY_BUF_SIZE, GFP_KERNEL);
-		if (!tty->read_buf)
-			return -ENOMEM;
-	}
-	if (!tty->echo_buf) {
-		tty->echo_buf = kzalloc(N_TTY_BUF_SIZE, GFP_KERNEL);
+	tty->read_buf = kzalloc(N_TTY_BUF_SIZE, GFP_KERNEL);
+	tty->echo_buf = kzalloc(N_TTY_BUF_SIZE, GFP_KERNEL);
+	if (!tty->read_buf || !tty->echo_buf)
+		goto err_free_bufs;
 
-		if (!tty->echo_buf)
-			return -ENOMEM;
-	}
 	reset_buffer_flags(tty);
 	tty_unthrottle(tty);
 	tty->column = 0;
@@ -1605,6 +1595,11 @@ static int n_tty_open(struct tty_struct *tty)
 	tty->minimum_to_wake = 1;
 	tty->closing = 0;
 	return 0;
+err_free_bufs:
+	kfree(tty->read_buf);
+	kfree(tty->echo_buf);
+
+	return -ENOMEM;
 }
 
 static inline int input_available_p(struct tty_struct *tty, int amt)