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authorstephen hemminger <shemminger@vyatta.com>2010-07-27 08:26:30 +0000
committerDavid S. Miller <davem@davemloft.net>2010-07-28 10:50:55 -0700
commiteeaf61d8891f9c9ed12c1a667e72bf83f0857954 (patch)
treedaeda447800df1349559268d8f6e79c90dcd22dd /net/bridge
parentff847ac2d3e90edd94674c28bade25ae1e6a2e49 (diff)
downloadkernel-eeaf61d8891f9c9ed12c1a667e72bf83f0857954.tar.gz
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/bridge')
-rw-r--r--net/bridge/br_device.c4
-rw-r--r--net/bridge/br_fdb.c2
-rw-r--r--net/bridge/br_input.c6
-rw-r--r--net/bridge/br_stp_bpdu.c2
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)