netdev - [PATCH, RFC 18/30] atm: firestream: fix interruptible_sleep

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Message-Id: <1388664474-1710039-19-git-send-email-arnd@arndb.de>
Date:	Thu,  2 Jan 2014 13:07:42 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-kernel@...r.kernel.org
Cc:	Arnd Bergmann <arnd@...db.de>,
	Chas Williams <chas@....nrl.navy.mil>,
	linux-atm-general@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: [PATCH, RFC 18/30] atm: firestream: fix interruptible_sleep_on race

interruptible_sleep_on is racy and going away. This replaces the one use
in the firestream driver with the appropriate wait_event_interruptible
variant.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Cc: Chas Williams <chas@....nrl.navy.mil>
Cc: linux-atm-general@...ts.sourceforge.net
Cc: netdev@...r.kernel.org
---
 drivers/atm/firestream.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/atm/firestream.c b/drivers/atm/firestream.c
index b41c948..f43e1c1 100644
--- a/drivers/atm/firestream.c
+++ b/drivers/atm/firestream.c
@@ -736,8 +736,8 @@ static void process_txdone_queue (struct fs_dev *dev, struct queue *q)
       
 			skb = td->skb;
 			if (skb == FS_VCC (ATM_SKB(skb)->vcc)->last_skb) {
-				wake_up_interruptible (& FS_VCC (ATM_SKB(skb)->vcc)->close_wait);
 				FS_VCC (ATM_SKB(skb)->vcc)->last_skb = NULL;
+				wake_up_interruptible (& FS_VCC (ATM_SKB(skb)->vcc)->close_wait);
 			}
 			td->dev->ntxpckts--;
 
@@ -1123,7 +1123,7 @@ static void fs_close(struct atm_vcc *atm_vcc)
 		   this sleep_on, we'll lose any reference to these packets. Memory leak!
 		   On the other hand, it's awfully convenient that we can abort a "close" that
 		   is taking too long. Maybe just use non-interruptible sleep on? -- REW */
-		interruptible_sleep_on (& vcc->close_wait);
+		wait_event_interruptible(vcc->close_wait, !vcc->last_skb);
 	}
 
 	txtp = &atm_vcc->qos.txtp;
-- 
1.8.3.2

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