linux-kernel - [PATCH 13/19] tty: Handle NULL tty->ldisc

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Message-Id: <1448660356-6328-14-git-send-email-peter@hurleysoftware.com>
Date:	Fri, 27 Nov 2015 16:39:10 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH 13/19] tty: Handle NULL tty->ldisc

In preparation of destroying line discipline on hangup, fix
ldisc core operations to properly handle when the tty's ldisc is
NULL.

Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 drivers/tty/tty_ldisc.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index e9a19c9..680c049 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -269,7 +269,8 @@ const struct file_operations tty_ldiscs_proc_fops = {
 struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *tty)
 {
 	ldsem_down_read(&tty->ldisc_sem, MAX_SCHEDULE_TIMEOUT);
-	WARN_ON(!tty->ldisc);
+	if (!tty->ldisc)
+		ldsem_up_read(&tty->ldisc_sem);
 	return tty->ldisc;
 }
 EXPORT_SYMBOL_GPL(tty_ldisc_ref_wait);
@@ -482,7 +483,7 @@ static int tty_ldisc_open(struct tty_struct *tty, struct tty_ldisc *ld)
 		if (ret)
 			clear_bit(TTY_LDISC_OPEN, &tty->flags);
 
-		tty_ldisc_debug(tty, "%p: opened\n", tty->ldisc);
+		tty_ldisc_debug(tty, "%p: opened\n", ld);
 		return ret;
 	}
 	return 0;
@@ -503,7 +504,7 @@ static void tty_ldisc_close(struct tty_struct *tty, struct tty_ldisc *ld)
 	clear_bit(TTY_LDISC_OPEN, &tty->flags);
 	if (ld->ops->close)
 		ld->ops->close(tty);
-	tty_ldisc_debug(tty, "%p: closed\n", tty->ldisc);
+	tty_ldisc_debug(tty, "%p: closed\n", ld);
 }
 
 /**
@@ -566,6 +567,11 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
 	if (retval)
 		goto err;
 
+	if (!tty->ldisc) {
+		retval = -EIO;
+		goto out;
+	}
+
 	/* Check the no-op case */
 	if (tty->ldisc->ops->num == ldisc)
 		goto out;
@@ -681,7 +687,7 @@ void tty_ldisc_hangup(struct tty_struct *tty)
 	int reset = tty->driver->flags & TTY_DRIVER_RESET_TERMIOS;
 	int err = 0;
 
-	tty_ldisc_debug(tty, "%p: closing\n", tty->ldisc);
+	tty_ldisc_debug(tty, "%p: hangup\n", tty->ldisc);
 
 	ld = tty_ldisc_ref(tty);
 	if (ld != NULL) {
@@ -765,6 +771,8 @@ int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty)
 
 static void tty_ldisc_kill(struct tty_struct *tty)
 {
+	if (!tty->ldisc)
+		return;
 	/*
 	 * Now kill off the ldisc
 	 */
-- 
2.6.3

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