can: sja1000: remove obsolete variable open_time

The variable open_time in the struct sja1000_priv was used to protect
sja1000_set_mode() only to be called, if the interface is up. Now the CAN
device infrastructure takes care of this.
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/sja1000/sja1000.c

@@ -188,11 +188,6 @@ static void sja1000_start(struct net_device *dev)
 
 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
 {
-	struct sja1000_priv *priv = netdev_priv(dev);
-
-	if (!priv->open_time)
-		return -EINVAL;
-
 	switch (mode) {
 	case CAN_MODE_START:
 		sja1000_start(dev);
@@ -579,7 +574,6 @@ static int sja1000_open(struct net_device *dev)
 
 	/* init and start chi */
 	sja1000_start(dev);
-	priv->open_time = jiffies;
 
 	netif_start_queue(dev);
 
@@ -598,8 +592,6 @@ static int sja1000_close(struct net_device *dev)
 
 	close_candev(dev);
 
-	priv->open_time = 0;
-
 	return 0;
 }
 

drivers/net/can/sja1000/sja1000.h

@@ -152,7 +152,6 @@
  */
 struct sja1000_priv {
 	struct can_priv can;	/* must be the first member */
-	int open_time;
 	struct sk_buff *echo_skb;
 
 	/* the lower-layer is responsible for appropriate locking */