linux-kernel - [PATCH v3 12/23] tty: Kick waiters _after

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Date:	Tue,  5 Feb 2013 15:20:27 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alan Cox <alan@...ux.intel.com>, Jiri Slaby <jslaby@...e.cz>,
	Sasha Levin <levinsasha928@...il.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	Ilya Zykov <ilya@...x.ru>, Dave Jones <davej@...hat.com>,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH v3 12/23] tty: Kick waiters _after_ the ldisc is locked


Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 drivers/tty/tty_ldisc.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index c903778..8a86a72 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -604,6 +604,12 @@ static bool tty_ldisc_hangup_halt(struct tty_struct *tty)
 
 	clear_bit(TTY_LDISC, &tty->flags);
 
+	/* Wakeup waiters so they can discover the tty is hupping, abort
+	 * their i/o loops, and release their ldisc references
+	 */
+	wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
+	wake_up_interruptible_poll(&tty->read_wait, POLLIN);
+
 	if (tty->ldisc) {	/* Not yet closed */
 		tty_unlock(tty);
 
@@ -875,12 +881,6 @@ void tty_ldisc_hangup(struct tty_struct *tty)
 		tty_ldisc_deref(ld);
 	}
 	/*
-	 * FIXME: Once we trust the LDISC code better we can wait here for
-	 * ldisc completion and fix the driver call race
-	 */
-	wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
-	wake_up_interruptible_poll(&tty->read_wait, POLLIN);
-	/*
 	 * Shutdown the current line discipline, and reset it to
 	 * N_TTY if need be.
 	 *
-- 
1.8.1.2

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