diff options
| author | stephen hemminger <shemminger@vyatta.com> | 2010-07-27 08:26:30 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-07-28 10:50:55 -0700 |
| commit | eeaf61d8891f9c9ed12c1a667e72bf83f0857954 (patch) | |
| tree | daeda447800df1349559268d8f6e79c90dcd22dd /net | |
| parent | ff847ac2d3e90edd94674c28bade25ae1e6a2e49 (diff) | |
| download | linux-eeaf61d8891f9c9ed12c1a667e72bf83f0857954.tar.bz2 | |
bridge: add rcu_read_lock on transmit
Long ago, when bridge was converted to RCU, rcu lock was equivalent
to having preempt disabled. RCU has changed a lot since then and
bridge code was still assuming the since transmit was called with
bottom half disabled, it was RCU safe.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Tested-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/bridge/br_device.c | 4 | ||||
| -rw-r--r-- | net/bridge/br_fdb.c | 2 | ||||
| -rw-r--r-- | net/bridge/br_input.c | 6 | ||||
| -rw-r--r-- | net/bridge/br_stp_bpdu.c | 2 |
4 files changed, 8 insertions, 6 deletions
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c index 753fc4221f3c..4cec8051164d 100644 --- a/net/bridge/br_device.c +++ b/net/bridge/br_device.c @@ -22,7 +22,7 @@ #include <asm/uaccess.h> #include "br_private.h" -/* net device transmit always called with no BH (preempt_disabled) */ +/* net device transmit always called with BH disabled */ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev) { struct net_bridge *br = netdev_priv(dev); @@ -46,6 +46,7 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev) skb_reset_mac_header(skb); skb_pull(skb, ETH_HLEN); + rcu_read_lock(); if (is_multicast_ether_addr(dest)) { if (br_multicast_rcv(br, NULL, skb)) goto out; @@ -61,6 +62,7 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev) br_flood_deliver(br, skb); out: + rcu_read_unlock(); return NETDEV_TX_OK; } diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c index b01dde35a69e..7204ad3aff65 100644 --- a/net/bridge/br_fdb.c +++ b/net/bridge/br_fdb.c @@ -214,7 +214,7 @@ void br_fdb_delete_by_port(struct net_bridge *br, spin_unlock_bh(&br->hash_lock); } -/* No locking or refcounting, assumes caller has no preempt (rcu_read_lock) */ +/* No locking or refcounting, assumes caller has rcu_read_lock */ struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br, const unsigned char *addr) { diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c index d36e700f7a26..114365c9eb1c 100644 --- a/net/bridge/br_input.c +++ b/net/bridge/br_input.c @@ -37,7 +37,7 @@ static int br_pass_frame_up(struct sk_buff *skb) netif_receive_skb); } -/* note: already called with rcu_read_lock (preempt_disabled) */ +/* note: already called with rcu_read_lock */ int br_handle_frame_finish(struct sk_buff *skb) { const unsigned char *dest = eth_hdr(skb)->h_dest; @@ -108,7 +108,7 @@ drop: goto out; } -/* note: already called with rcu_read_lock (preempt_disabled) */ +/* note: already called with rcu_read_lock */ static int br_handle_local_finish(struct sk_buff *skb) { struct net_bridge_port *p = rcu_dereference(skb->dev->br_port); @@ -133,7 +133,7 @@ static inline int is_link_local(const unsigned char *dest) /* * Called via br_handle_frame_hook. * Return NULL if skb is handled - * note: already called with rcu_read_lock (preempt_disabled) + * note: already called with rcu_read_lock */ struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb) { diff --git a/net/bridge/br_stp_bpdu.c b/net/bridge/br_stp_bpdu.c index 217bd225a42f..5854e8285a9c 100644 --- a/net/bridge/br_stp_bpdu.c +++ b/net/bridge/br_stp_bpdu.c @@ -131,7 +131,7 @@ void br_send_tcn_bpdu(struct net_bridge_port *p) /* * Called from llc. * - * NO locks, but rcu_read_lock (preempt_disabled) + * NO locks, but rcu_read_lock */ void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, struct net_device *dev) |