---

yaml --- r: 364269 b: refs/heads/master c: 16759f6 h: refs/heads/master i: 364267: 25b2b00 v: v3
git-mirror · Mar 18, 2013 · 9709620 · 9709620
1 parent 9f75c3d
commit 9709620
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Showing 2 changed files with 6 additions and 10 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ebc9baed42e42f9b51cf61672b7afb72f068d523
+refs/heads/master: 16759f6cd8c590fa23cb2956fdf32fe23a67e482
diff --git a/trunk/drivers/tty/tty_ldisc.c b/trunk/drivers/tty/tty_ldisc.c
@@ -42,13 +42,6 @@ static DECLARE_WAIT_QUEUE_HEAD(tty_ldisc_wait);
 /* Line disc dispatch table */
 static struct tty_ldisc_ops *tty_ldiscs[NR_LDISCS];
 
-static inline struct tty_ldisc *get_ldisc(struct tty_ldisc *ld)
-{
-	if (ld)
-		atomic_inc(&ld->users);
-	return ld;
-}
-
 /**
  *	tty_register_ldisc	-	install a line discipline
  *	@disc: ldisc number
@@ -269,10 +262,13 @@ static struct tty_ldisc *tty_ldisc_try(struct tty_struct *tty)
 	unsigned long flags;
 	struct tty_ldisc *ld;
 
+	/* FIXME: this allows reference acquire after TTY_LDISC is cleared */
 	raw_spin_lock_irqsave(&tty_ldisc_lock, flags);
 	ld = NULL;
-	if (test_bit(TTY_LDISC, &tty->flags))
-		ld = get_ldisc(tty->ldisc);
+	if (test_bit(TTY_LDISC, &tty->flags) && tty->ldisc) {
+		ld = tty->ldisc;
+		atomic_inc(&ld->users);
+	}
 	raw_spin_unlock_irqrestore(&tty_ldisc_lock, flags);
 	return ld;
 }