From: Arnd Bergmann <arnd@arndb.de>
Date: Thu, 2 Jan 2014 12:07:40 +0000 (+0100)
Subject: tty: synclink: avoid sleep_on race
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b8c98ae49e8d53344b1d62417eea05ebc3cdbd78;p=linux-beck.git

tty: synclink: avoid sleep_on race

The four variants of the synclink driver use the same code in their
open() callback to wait for a port in process of being closed,
using interruptible_sleep_on, which is racy and going away soon.

Making things worse, these functions hold the BTM while doing so,
which means that if we ever enter this code path, we cannot actually
continue since the other thread that is in process of closing the
port can no longer get the BTM.

This addresses both issues by using wait_event_interruptible_tty()
instead.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index d39cca659a3f..8320abd1ef14 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -2511,8 +2511,8 @@ static int mgslpc_open(struct tty_struct *tty, struct file * filp)
 
 	/* If port is closing, signal caller to try again */
 	if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING){
-		if (port->flags & ASYNC_CLOSING)
-			interruptible_sleep_on(&port->close_wait);
+		wait_event_interruptible_tty(tty, port->close_wait,
+					     !(port->flags & ASYNC_CLOSING));
 		retval = ((port->flags & ASYNC_HUP_NOTIFY) ?
 			-EAGAIN : -ERESTARTSYS);
 		goto cleanup;
diff --git a/drivers/tty/synclink.c b/drivers/tty/synclink.c
index e1ce141bad5e..5ae14b46cce0 100644
--- a/drivers/tty/synclink.c
+++ b/drivers/tty/synclink.c
@@ -3404,8 +3404,8 @@ static int mgsl_open(struct tty_struct *tty, struct file * filp)
 
 	/* If port is closing, signal caller to try again */
 	if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
-		if (info->port.flags & ASYNC_CLOSING)
-			interruptible_sleep_on(&info->port.close_wait);
+		wait_event_interruptible_tty(tty, info->port.close_wait,
+				     !(info->port.flags & ASYNC_CLOSING));
 		retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
 			-EAGAIN : -ERESTARTSYS);
 		goto cleanup;
diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
index 1abf946463f6..c359a91f7346 100644
--- a/drivers/tty/synclink_gt.c
+++ b/drivers/tty/synclink_gt.c
@@ -674,8 +674,8 @@ static int open(struct tty_struct *tty, struct file *filp)
 
 	/* If port is closing, signal caller to try again */
 	if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
-		if (info->port.flags & ASYNC_CLOSING)
-			interruptible_sleep_on(&info->port.close_wait);
+		wait_event_interruptible_tty(tty, info->port.close_wait,
+					     !(info->port.flags & ASYNC_CLOSING));
 		retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
 			-EAGAIN : -ERESTARTSYS);
 		goto cleanup;
diff --git a/drivers/tty/synclinkmp.c b/drivers/tty/synclinkmp.c
index dc6e96996ead..144202eef6fe 100644
--- a/drivers/tty/synclinkmp.c
+++ b/drivers/tty/synclinkmp.c
@@ -754,8 +754,8 @@ static int open(struct tty_struct *tty, struct file *filp)
 
 	/* If port is closing, signal caller to try again */
 	if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
-		if (info->port.flags & ASYNC_CLOSING)
-			interruptible_sleep_on(&info->port.close_wait);
+		wait_event_interruptible_tty(tty, info->port.close_wait,
+					     !(info->port.flags & ASYNC_CLOSING));
 		retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
 			-EAGAIN : -ERESTARTSYS);
 		goto cleanup;