[PATCH] (3/4) baycom/hdlcdrv unregister

If baycom driver has never been opened, it will attempt to free
an IRQ that it never registered when removed.  The problem is that hdlcdrv
does not keep track of open/close state.

drivers/net/hamradio/hdlcdrv.c

@@ -553,6 +553,7 @@ static int hdlcdrv_open(struct net_device *dev)
 	/*
 	 * initialise some variables
 	 */
+	s->opened = 1;
 	s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
 	s->hdlcrx.in_hdlc_rx = 0;
 	s->hdlcrx.rx_state = 0;
@@ -592,6 +593,7 @@ static int hdlcdrv_close(struct net_device *dev)
 	if (s->skb)
 		dev_kfree_skb(s->skb);
 	s->skb = NULL;
+	s->opened = 0;
 	return i;
 }
 
@@ -844,7 +846,7 @@ void hdlcdrv_unregister(struct net_device *dev)
 
 	BUG_ON(s->magic != HDLCDRV_MAGIC);
 
-	if (s->ops->close)
+	if (s->opened && s->ops->close)
 		s->ops->close(dev);
 	unregister_netdev(dev);
 	

include/linux/hdlcdrv.h

@@ -180,6 +180,7 @@ struct hdlcdrv_ops {
 
 struct hdlcdrv_state {
 	int magic;
+	int opened;
 
 	const struct hdlcdrv_ops *ops;