libertas: properly account for queue commands

patch 29f5f2a1 in mainline.

Properly account for queue commands, this fixes a problem reported
by Holger Schurig when using the debugfs interface.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/net/wireless/libertas/cmd.c

@@ -881,6 +881,10 @@ static int wlan_cmd_mesh_access(wlan_private * priv,
 	return 0;
 }
 
+/*
+ * Note: NEVER use libertas_queue_cmd() with addtail==0 other than for
+ * the command timer, because it does not account for queued commands.
+ */
 void libertas_queue_cmd(wlan_adapter * adapter, struct cmd_ctrl_node *cmdnode, u8 addtail)
 {
 	unsigned long flags;
@@ -910,10 +914,11 @@ void libertas_queue_cmd(wlan_adapter * adapter, struct cmd_ctrl_node *cmdnode, u
 
 	spin_lock_irqsave(&adapter->driver_lock, flags);
 
-	if (addtail)
+	if (addtail) {
 		list_add_tail((struct list_head *)cmdnode,
 			      &adapter->cmdpendingq);
-	else
+		adapter->nr_cmd_pending++;
+	} else
 		list_add((struct list_head *)cmdnode, &adapter->cmdpendingq);
 
 	spin_unlock_irqrestore(&adapter->driver_lock, flags);
@@ -1400,7 +1405,6 @@ int libertas_prepare_and_send_command(wlan_private * priv,
 	cmdnode->cmdwaitqwoken = 0;
 
 	libertas_queue_cmd(adapter, cmdnode, 1);
-	adapter->nr_cmd_pending++;
 	wake_up_interruptible(&priv->mainthread.waitq);
 
 	if (wait_option & cmd_option_waitforrsp) {