From: Hangbin Liu <liuhangbin@gmail.com>
To: netdev@vger.kernel.org
Cc: Vladimir Oltean <vladimir.oltean@nxp.com>,
Jay Vosburgh <jay.vosburgh@canonical.com>,
David Miller <davem@davemloft.net>,
Hangbin Liu <liuhangbin@gmail.com>
Subject: [PATCH net] bonding: use rcu_dereference_rtnl when get bonding active slave
Date: Fri, 21 Jan 2022 16:25:18 +0800 [thread overview]
Message-ID: <20220121082518.1125142-1-liuhangbin@gmail.com> (raw)
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: 94dd016ae538 ("bond: pass get_ts_info and SIOC[SG]HWTSTAMP ioctl to active device")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
drivers/net/bonding/bond_main.c | 4 ----
include/net/bonding.h | 2 +-
2 files changed, 1 insertion(+), 5 deletions(-)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index ec498ce70f35..238b56d77c36 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -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;
diff --git a/include/net/bonding.h b/include/net/bonding.h
index f6ae3a4baea4..83cfd2d70247 100644
--- a/include/net/bonding.h
+++ b/include/net/bonding.h
@@ -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;
}
--
2.31.1
next reply other threads:[~2022-01-21 8:26 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-21 8:25 Hangbin Liu [this message]
2022-01-24 12:00 ` [PATCH net] bonding: use rcu_dereference_rtnl when get bonding active slave patchwork-bot+netdevbpf
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