bonding: use rcu_access_pointer() in bonding_show_mii_status()

curr_active_slave is rcu protected, and bonding_show_mii_status() only
wants to check if pointer is NULL or not.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Veaceslav Falico <vfalico@gmail.com>
Reviewed-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index daed52f68ce1614ec94772ad1628f09417e04bfe..98db8edd9c755c55d04a26b0b40143ba80d15a55 100644 (file)
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -492,8 +492,9 @@ static ssize_t bonding_show_mii_status(struct device *d,
                                       char *buf)
 {
        struct bonding *bond = to_bond(d);
+       bool active = !!rcu_access_pointer(bond->curr_active_slave);
 
-       return sprintf(buf, "%s\n", bond->curr_active_slave ? "up" : "down");
+       return sprintf(buf, "%s\n", active ? "up" : "down");
 }
 static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);