linux-kernel - [ 19/48] sunvnet: clean up objects created in vnet

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Message-Id: <20141116215329.430913240@1wt.eu>
Date:	Sun, 16 Nov 2014 22:53:47 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Sowmini Varadhan <sowmini.varadhan@...cle.com>,
	Dave Kleikamp <dave.kleikamp@...cle.com>,
	"David S. Miller" <davem@...emloft.net>, Willy Tarreau <w@....eu>
Subject: [ 19/48] sunvnet: clean up objects created in vnet_new() on

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------
 vnet_exit()

From: Sowmini Varadhan <sowmini.varadhan@...cle.com>

[ Upstream commit a4b70a07ed12a71131cab7adce2ce91c71b37060 ]

Nothing cleans up the objects created by
vnet_new(), they are completely leaked.

vnet_exit(), after doing the vio_unregister_driver() to clean
up ports, should call a helper function that iterates over vnet_list
and cleans up those objects. This includes unregister_netdevice()
as well as free_netdev().

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>
Acked-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Reviewed-by: Karl Volz <karl.volz@...cle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/net/sunvnet.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/net/sunvnet.c b/drivers/net/sunvnet.c
index b6d0348..667c674 100644
--- a/drivers/net/sunvnet.c
+++ b/drivers/net/sunvnet.c
@@ -1096,6 +1096,24 @@ static struct vnet * __devinit vnet_find_or_create(const u64 *local_mac)
 	return vp;
 }
 
+static void vnet_cleanup(void)
+{
+	struct vnet *vp;
+	struct net_device *dev;
+
+	mutex_lock(&vnet_list_mutex);
+	while (!list_empty(&vnet_list)) {
+		vp = list_first_entry(&vnet_list, struct vnet, list);
+		list_del(&vp->list);
+		dev = vp->dev;
+		/* vio_unregister_driver() should have cleaned up port_list */
+		BUG_ON(!list_empty(&vp->port_list));
+		unregister_netdev(dev);
+		free_netdev(dev);
+	}
+	mutex_unlock(&vnet_list_mutex);
+}
+
 static const char *local_mac_prop = "local-mac-address";
 
 static struct vnet * __devinit vnet_find_parent(struct mdesc_handle *hp,
@@ -1261,7 +1279,6 @@ static int vnet_port_remove(struct vio_dev *vdev)
 
 		kfree(port);
 
-		unregister_netdev(vp->dev);
 	}
 	return 0;
 }
@@ -1292,6 +1309,7 @@ static int __init vnet_init(void)
 static void __exit vnet_exit(void)
 {
 	vio_unregister_driver(&vnet_port_driver);
+	vnet_cleanup();
 }
 
 module_init(vnet_init);
-- 
1.7.12.2.21.g234cd45.dirty



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