Re: [syzbot] Re: [syzbot] [net?] possible deadlock in team_device_event (3)

syzbot
2024-08-02T14:20:59Z

drivers/net/team/team_core.c | 22 ----------------------
1 file changed, 22 deletions(-)

diff --git a/drivers/net/team/team_core.c b/drivers/net/team/team_core.c
index ab1935a4aa2c..f7bab2d2a281 100644
--- a/drivers/net/team/team_core.c
+++ b/drivers/net/team/team_core.c
@@ -1668,7 +1668,6 @@ static void team_uninit(struct net_device *dev)
struct team_port *port;
struct team_port *tmp;

- mutex_lock(&team->lock);
list_for_each_entry_safe(port, tmp, &team->port_list, list)
team_port_del(team, port->dev);

@@ -1677,7 +1676,6 @@ static void team_uninit(struct net_device *dev)
team_mcast_rejoin_fini(team);
team_notify_peers_fini(team);
team_queue_override_fini(team);
- mutex_unlock(&team->lock);
netdev_change_features(dev);
lockdep_unregister_key(&team->team_lock_key);
}
@@ -1818,7 +1816,6 @@ static int team_change_mtu(struct net_device *dev, int new_mtu)
* Alhough this is reader, it's guarded by team lock. It's not possible
* to traverse list in reverse under rcu_read_lock
*/
- mutex_lock(&team->lock);
team->port_mtu_change_allowed = true;
list_for_each_entry(port, &team->port_list, list) {
err = dev_set_mtu(port->dev, new_mtu);
@@ -1829,7 +1826,6 @@ static int team_change_mtu(struct net_device *dev, int new_mtu)
}
}
team->port_mtu_change_allowed = false;
- mutex_unlock(&team->lock);

WRITE_ONCE(dev->mtu, new_mtu);

@@ -1839,7 +1835,6 @@ static int team_change_mtu(struct net_device *dev, int new_mtu)
list_for_each_entry_continue_reverse(port, &team->port_list, list)
dev_set_mtu(port->dev, dev->mtu);
team->port_mtu_change_allowed = false;
- mutex_unlock(&team->lock);

return err;
}
@@ -1893,20 +1888,17 @@ static int team_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
* Alhough this is reader, it's guarded by team lock. It's not possible
* to traverse list in reverse under rcu_read_lock
*/
- mutex_lock(&team->lock);
list_for_each_entry(port, &team->port_list, list) {
err = vlan_vid_add(port->dev, proto, vid);
if (err)
goto unwind;
}
- mutex_unlock(&team->lock);

return 0;

unwind:
list_for_each_entry_continue_reverse(port, &team->port_list, list)
vlan_vid_del(port->dev, proto, vid);
- mutex_unlock(&team->lock);

return err;
}
@@ -1916,10 +1908,8 @@ static int team_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, u16 vid)
struct team *team = netdev_priv(dev);
struct team_port *port;

- mutex_lock(&team->lock);
list_for_each_entry(port, &team->port_list, list)
vlan_vid_del(port->dev, proto, vid);
- mutex_unlock(&team->lock);

return 0;
}
@@ -1941,9 +1931,7 @@ static void team_netpoll_cleanup(struct net_device *dev)
{
struct team *team = netdev_priv(dev);

- mutex_lock(&team->lock);
__team_netpoll_cleanup(team);
- mutex_unlock(&team->lock);
}

static int team_netpoll_setup(struct net_device *dev,
@@ -1953,7 +1941,6 @@ static int team_netpoll_setup(struct net_device *dev,
struct team_port *port;
int err = 0;

- mutex_lock(&team->lock);
list_for_each_entry(port, &team->port_list, list) {
err = __team_port_enable_netpoll(port);
if (err) {
@@ -1961,7 +1948,6 @@ static int team_netpoll_setup(struct net_device *dev,
break;
}
}
- mutex_unlock(&team->lock);
return err;
}
#endif
@@ -1972,9 +1958,7 @@ static int team_add_slave(struct net_device *dev, struct net_device *port_dev,
struct team *team = netdev_priv(dev);
int err;

- mutex_lock(&team->lock);
err = team_port_add(team, port_dev, extack);
- mutex_unlock(&team->lock);

if (!err)
netdev_change_features(dev);
@@ -1987,9 +1971,7 @@ static int team_del_slave(struct net_device *dev, struct net_device *port_dev)
struct team *team = netdev_priv(dev);
int err;

- mutex_lock(&team->lock);
err = team_port_del(team, port_dev);
- mutex_unlock(&team->lock);

if (err)
return err;
@@ -2945,11 +2927,7 @@ static void __team_port_change_port_removed(struct team_port *port)

static void team_port_change_check(struct team_port *port, bool linkup)
{
- struct team *team = port->team;
-
- mutex_lock(&team->lock);
__team_port_change_check(port, linkup);
- mutex_unlock(&team->lock);
}

--