[PATCH] isdn: fix possible circular locking dependency

[Xiaotian Feng]

There's a circular locking dependency:

---> isdn_net_get_locked_lp
  --->lock &nd->queue_lock
  --->lock &nd->queue->xmit_lock
  .....................
  ---->unlock &nd->queue_lock

---> isdn_net_writebuf_skb (called with &nd->queue->xmit_lock locked)
  ---->isdn_net_inc_frame_cnt
    Â---->isdn_net_device_busy
       ----> lock &nd->queue_lock

This will trigger lockdep warnings:

Â=======================================================
Â[ INFO: possible circular locking dependency detected ]
Â2.6.32-rc4-testing #7
Â-------------------------------------------------------
Âipppd/28379 is trying to acquire lock:
Â(&netdev->queue_lock){......}, at: [<e62ad0fd>] isdn_net_device_busy+0x2c/0x74 [isdn]

Âbut task is already holding lock:
Â(&netdev->local->xmit_lock){+.....}, at: [<e62aefc2>] isdn_net_write_super+0x3f/0x6e [isdn]

Âwhich lock already depends on the new lock.
 .......

 We don't need to lock nd->queue->xmit_lock to protect single
isdn_net_lp_busy(). This can fix above lockdep warnings.

Reported-and-tested-by: Tilman Schmidt <tilman@xxxxxxx>
Signed-off-by: Xiaotian Feng <xtfeng@xxxxxxxxx>
---
 drivers/isdn/i4l/isdn_net.h |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/isdn/i4l/isdn_net.h b/drivers/isdn/i4l/isdn_net.h
index 74032d0..7511f08 100644
--- a/drivers/isdn/i4l/isdn_net.h
+++ b/drivers/isdn/i4l/isdn_net.h
@@ -83,19 +83,19 @@ static __inline__ isdn_net_local * isdn_net_get_locked_lp(isdn_net_dev *nd)
 
 	spin_lock_irqsave(&nd->queue_lock, flags);
 	lp = nd->queue;         /* get lp on top of queue */
-	spin_lock(&nd->queue->xmit_lock);
 	while (isdn_net_lp_busy(nd->queue)) {
-		spin_unlock(&nd->queue->xmit_lock);
 		nd->queue = nd->queue->next;
 		if (nd->queue == lp) { /* not found -- should never happen */
 			lp = NULL;
 			goto errout;
 		}
-		spin_lock(&nd->queue->xmit_lock);
 	}
 	lp = nd->queue;
 	nd->queue = nd->queue->next;
+	spin_unlock_irqrestore(&nd->queue_lock, flags);
+	spin_lock(&lp->xmit_lock);
 	local_bh_disable();
+	return lp;
 errout:
 	spin_unlock_irqrestore(&nd->queue_lock, flags);
 	return lp;
-- 
1.6.2.5

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