linux-kernel - [PATCH -next v2 02/26] tty: Invert tty_lock/ldisc

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Date:	Wed,  5 Nov 2014 12:12:45 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jiri Slaby <jslaby@...e.cz>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH -next v2 02/26] tty: Invert tty_lock/ldisc_sem lock order

Dropping the tty lock to acquire the tty->ldisc_sem allows several
race conditions (such as hangup while changing the ldisc) which requires
extra states and testing. The ldisc_sem->tty_lock lock order has
not been required since tty buffer ownership was moved to tty_port.

Reviewed-by: Alan Cox <alan@...ux.intel.com>
Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 drivers/tty/tty_ldisc.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 332a622..28858eb 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -523,9 +523,11 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
 	if (IS_ERR(new_ldisc))
 		return PTR_ERR(new_ldisc);
 
+	tty_lock(tty);
 	retval = tty_ldisc_lock_pair_timeout(tty, o_tty, 5 * HZ);
 	if (retval) {
 		tty_ldisc_put(new_ldisc);
+		tty_unlock(tty);
 		return retval;
 	}
 
@@ -536,11 +538,11 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
 	if (tty->ldisc->ops->num == ldisc) {
 		tty_ldisc_enable_pair(tty, o_tty);
 		tty_ldisc_put(new_ldisc);
+		tty_unlock(tty);
 		return 0;
 	}
 
 	old_ldisc = tty->ldisc;
-	tty_lock(tty);
 
 	if (test_bit(TTY_HUPPING, &tty->flags) ||
 	    test_bit(TTY_HUPPED, &tty->flags)) {
@@ -675,8 +677,6 @@ void tty_ldisc_hangup(struct tty_struct *tty)
 	wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
 	wake_up_interruptible_poll(&tty->read_wait, POLLIN);
 
-	tty_unlock(tty);
-
 	/*
 	 * Shutdown the current line discipline, and reset it to
 	 * N_TTY if need be.
@@ -684,7 +684,6 @@ void tty_ldisc_hangup(struct tty_struct *tty)
 	 * Avoid racing set_ldisc or tty_ldisc_release
 	 */
 	tty_ldisc_lock_pair(tty, tty->link);
-	tty_lock(tty);
 
 	if (tty->ldisc) {
 
-- 
2.1.3

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