net: ksz884x: optimize netdev_open flow and remove static variable

remove the static next_jiffies variable, and reinitialize next_jiffies
to simplify netdev_open

Signed-off-by: wujunwen <wudaemon@163.com>
Link: https://lore.kernel.org/r/20220315122857.78601-1-wudaemon@163.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/micrel/ksz884x.c

@@ -5225,7 +5225,6 @@ static irqreturn_t netdev_intr(int irq, void *dev_id)
  * Linux network device functions
  */
 
-static unsigned long next_jiffies;
 
 #ifdef CONFIG_NET_POLL_CONTROLLER
 static void netdev_netpoll(struct net_device *dev)
@@ -5411,10 +5410,12 @@ static int netdev_open(struct net_device *dev)
 	struct dev_info *hw_priv = priv->adapter;
 	struct ksz_hw *hw = &hw_priv->hw;
 	struct ksz_port *port = &priv->port;
+	unsigned long next_jiffies;
 	int i;
 	int p;
 	int rc = 0;
 
+	next_jiffies = jiffies + HZ * 2;
 	priv->multicast = 0;
 	priv->promiscuous = 0;
 
@@ -5428,10 +5429,7 @@ static int netdev_open(struct net_device *dev)
 		if (rc)
 			return rc;
 		for (i = 0; i < hw->mib_port_cnt; i++) {
-			if (next_jiffies < jiffies)
-				next_jiffies = jiffies + HZ * 2;
-			else
-				next_jiffies += HZ * 1;
+			next_jiffies += HZ * 1;
 			hw_priv->counter[i].time = next_jiffies;
 			hw->port_mib[i].state = media_disconnected;
 			port_init_cnt(hw, i);
@@ -6563,6 +6561,7 @@ static void mib_read_work(struct work_struct *work)
 	struct dev_info *hw_priv =
 		container_of(work, struct dev_info, mib_read);
 	struct ksz_hw *hw = &hw_priv->hw;
+	unsigned long next_jiffies;
 	struct ksz_port_mib *mib;
 	int i;