bonding: show all the link status of slaves

There are four link statuses of a bonding slave, the procfs
code shows a wrong status when using downdelay/updelay:

(slave->link == BOND_LINK_UP) ? "up" : "down"

It doesn't respect the rest two statuses. This patch fixes it.

Cc: Jay Vosburgh <[e-mail]>
Cc: Andy Gospodarek <[e-mail]>
Cc: "David S. Miller" <[e-mail]>
Signed-off-by: Cong Wang <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/bonding/bond_procfs.c

···
 	}
 }
 
+static const char *bond_slave_link_status(s8 link)
+{
+	static const char * const status[] = {
+		[BOND_LINK_UP] = "up",
+		[BOND_LINK_FAIL] = "going down",
+		[BOND_LINK_DOWN] = "down",
+		[BOND_LINK_BACK] = "going back",
+	};
+
+	return status[link];
+}
+
 static void bond_info_show_slave(struct seq_file *seq,
 				 const struct slave *slave)
 {
 	struct bonding *bond = seq->private;
 
 	seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
-	seq_printf(seq, "MII Status: %s\n",
-		   (slave->link == BOND_LINK_UP) ?  "up" : "down");
+	seq_printf(seq, "MII Status: %s\n", bond_slave_link_status(slave->link));
 	if (slave->speed == SPEED_UNKNOWN)
 		seq_printf(seq, "Speed: %s\n", "Unknown");
 	else