netdev - [PATCH net] Phonet: ensure GPRS device does not go away during TX work

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Date:	Wed, 10 Dec 2008 15:15:28 +0200
From:	Rémi Denis-Courmont 
	<remi.denis-courmont@...ia.com>
To:	netdev@...r.kernel.org
Subject: [PATCH net] Phonet: ensure GPRS device does not go away during TX work

We need to hold the device while TX work is pending, as work is flushed
only after the network device is unregistered.

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@...ia.com>
---
 net/phonet/pep-gprs.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/net/phonet/pep-gprs.c b/net/phonet/pep-gprs.c
index e6e8e44..5985bc5 100644
--- a/net/phonet/pep-gprs.c
+++ b/net/phonet/pep-gprs.c
@@ -184,6 +184,7 @@ static int gprs_xmit(struct sk_buff *skb, struct net_device *net)
 	spin_lock(&dev->tx_lock);
 	if (likely(skb_queue_len(&dev->tx_queue) < dev->tx_max)) {
 		skb_queue_tail(&dev->tx_queue, skb);
+		dev_hold(net);
 		skb = NULL;
 	}
 	if (skb_queue_len(&dev->tx_queue) >= dev->tx_max)
@@ -221,6 +222,7 @@ static void gprs_tx(struct work_struct *work)
 			net->stats.tx_errors++;
 		}
 		release_sock(sk);
+		dev_put(net);
 	}
 
 	lock_sock(sk);
-- 
1.5.4.3

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