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bonding: use rcu_dereference_rtnl when get bonding active slave

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bond_option_active_slave_get_rcu() should not be used in rtnl_mutex as it
use rcu_dereference(). Replace to rcu_dereference_rtnl() so we also can use
this function in rtnl protected context.

With this update, we can rmeove the rcu_read_lock/unlock in
bonding .ndo_eth_ioctl and .get_ts_info.

Reported-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Fixes: 94dd016ae5 ("bond: pass get_ts_info and SIOC[SG]HWTSTAMP ioctl to active device")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hangbin Liu 2022-01-21 16:25:18 +08:00 committed by David S. Miller
parent 2148927e6e
commit aa6034678e
2 changed files with 1 additions and 5 deletions
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4
drivers/net/bonding/bond_main.c
View File

@ -4133,9 +4133,7 @@ static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cm
fallthrough;
case SIOCGHWTSTAMP:
rcu_read_lock();
real_dev = bond_option_active_slave_get_rcu(bond);
rcu_read_unlock();
if (!real_dev)
return -EOPNOTSUPP;
@ -5382,9 +5380,7 @@ static int bond_ethtool_get_ts_info(struct net_device *bond_dev,
struct net_device *real_dev;
struct phy_device *phydev;
rcu_read_lock();
real_dev = bond_option_active_slave_get_rcu(bond);
rcu_read_unlock();
if (real_dev) {
ops = real_dev->ethtool_ops;
phydev = real_dev->phydev;

2
include/net/bonding.h
View File

@ -346,7 +346,7 @@ static inline bool bond_uses_primary(struct bonding *bond)
static inline struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond)
{
struct slave *slave = rcu_dereference(bond->curr_active_slave);
struct slave *slave = rcu_dereference_rtnl(bond->curr_active_slave);
return bond_uses_primary(bond) && slave ? slave->dev : NULL;
}