Staging: batman-adv: fix rogue packets on shutdown

On module shutdown batman-adv would purge the internal packet
queue by sending all remaining packets which could confuse
other nodes. Now, the packets are silently discarded.

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/batman-adv/send.c

@@ -440,6 +440,9 @@ void send_outstanding_bcast_packet(struct work_struct *work)
 	hlist_del(&forw_packet->list);
 	spin_unlock_irqrestore(&forw_bcast_list_lock, flags);
 
+	if (atomic_read(&module_state) == MODULE_DEACTIVATING)
+		goto out;
+
 	/* rebroadcast packet */
 	rcu_read_lock();
 	list_for_each_entry_rcu(batman_if, &if_list, list) {
@@ -453,15 +456,15 @@ void send_outstanding_bcast_packet(struct work_struct *work)
 
 	forw_packet->num_packets++;
 
-	/* if we still have some more bcasts to send and we are not shutting
-	 * down */
-	if ((forw_packet->num_packets < 3) &&
-	    (atomic_read(&module_state) != MODULE_DEACTIVATING))
+	/* if we still have some more bcasts to send */
+	if (forw_packet->num_packets < 3) {
 		_add_bcast_packet_to_list(forw_packet, ((5 * HZ) / 1000));
-	else {
-		forw_packet_free(forw_packet);
-		atomic_inc(&bcast_queue_left);
+		return;
 	}
+
+out:
+	forw_packet_free(forw_packet);
+	atomic_inc(&bcast_queue_left);
 }
 
 void send_outstanding_bat_packet(struct work_struct *work)
@@ -476,6 +479,9 @@ void send_outstanding_bat_packet(struct work_struct *work)
 	hlist_del(&forw_packet->list);
 	spin_unlock_irqrestore(&forw_bat_list_lock, flags);
 
+	if (atomic_read(&module_state) == MODULE_DEACTIVATING)
+		goto out;
+
 	send_packet(forw_packet);
 
 	/**
@@ -483,10 +489,10 @@ void send_outstanding_bat_packet(struct work_struct *work)
 	 * to determine the queues wake up time unless we are
 	 * shutting down
 	 */
-	if ((forw_packet->own) &&
-	    (atomic_read(&module_state) != MODULE_DEACTIVATING))
+	if (forw_packet->own)
 		schedule_own_packet(forw_packet->if_incoming);
 
+out:
 	/* don't count own packet */
 	if (!forw_packet->own)
 		atomic_inc(&batman_queue_left);