bonding: fix locking in sysfs primary/active selection

[firefly-linux-kernel-4.4.55.git] / drivers / net / bonding / bond_sysfs.c

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 11b76b352415f6dedad302133b97e952728032dd..28a2d803e7e5bc695f2a26ec011cd564bacf2200 100644 (file)
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -1075,7 +1075,10 @@ static ssize_t bonding_store_primary(struct device *d,
        struct slave *slave;
        struct bonding *bond = to_bond(d);
 
-       write_lock_bh(&bond->lock);
+       rtnl_lock();
+       read_lock(&bond->lock);
+       write_lock_bh(&bond->curr_slave_lock);
+
        if (!USES_PRIMARY(bond->params.mode)) {
                printk(KERN_INFO DRV_NAME
                       ": %s: Unable to set primary slave; %s is in mode %d\n",
@@ -1109,8 +1112,8 @@ static ssize_t bonding_store_primary(struct device *d,
                }
        }
 out:
-       write_unlock_bh(&bond->lock);
-
+       write_unlock_bh(&bond->curr_slave_lock);
+       read_unlock(&bond->lock);
        rtnl_unlock();
 
        return count;
@@ -1190,7 +1193,8 @@ static ssize_t bonding_store_active_slave(struct device *d,
        struct bonding *bond = to_bond(d);
 
        rtnl_lock();
-       write_lock_bh(&bond->lock);
+       read_lock(&bond->lock);
+       write_lock_bh(&bond->curr_slave_lock);
 
        if (!USES_PRIMARY(bond->params.mode)) {
                printk(KERN_INFO DRV_NAME
@@ -1247,7 +1251,8 @@ static ssize_t bonding_store_active_slave(struct device *d,
                }
        }
 out:
-       write_unlock_bh(&bond->lock);
+       write_unlock_bh(&bond->curr_slave_lock);
+       read_unlock(&bond->lock);
        rtnl_unlock();
 
        return count;