linux-kernel - [099/114] Staging: batman-adv: Create batman

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Date:	Tue, 24 Aug 2010 15:45:44 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Sven Eckelmann <sven.eckelmann@....de>
Subject: [099/114] Staging: batman-adv: Create batman_if only on register event

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Sven Eckelmann <sven.eckelmann@....de>

commit 1189f130f89b73eecb6117c0fc5e90abbcb7faa0 upstream.

We try to get all events for all net_devices to be able to add special
sysfs folders for the batman-adv configuration. This also includes such
events like NETDEV_POST_INIT which has no valid kobject according to
v2.6.32-rc3-13-g7ffbe3f. This would create an oops in that situation.

It is enough to create the batman_if only on NETDEV_REGISTER events
because we will also receive those events for devices which already
existed when we registered the notifier call.

Signed-off-by: Sven Eckelmann <sven.eckelmann@....de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/staging/batman-adv/hard-interface.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/staging/batman-adv/hard-interface.c
+++ b/drivers/staging/batman-adv/hard-interface.c
@@ -397,15 +397,13 @@ static int hard_if_event(struct notifier
 	/* FIXME: each batman_if will be attached to a softif */
 	struct bat_priv *bat_priv = netdev_priv(soft_device);
 
-	if (!batman_if)
-		batman_if = hardif_add_interface(net_dev);
+	if (!batman_if && event == NETDEV_REGISTER)
+			batman_if = hardif_add_interface(net_dev);
 
 	if (!batman_if)
 		goto out;
 
 	switch (event) {
-	case NETDEV_REGISTER:
-		break;
 	case NETDEV_UP:
 		hardif_activate_interface(bat_priv, batman_if);
 		break;


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