From 33d480ce6d43326e2541fd79b3548858a174ec3c Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Thu, 11 Aug 2011 19:30:52 +0000 Subject: [PATCH] net: cleanup some rcu_dereference_raw RCU api had been completed and rcu_access_pointer() or rcu_dereference_protected() are better than generic rcu_dereference_raw() Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/core/dev.c | 10 +++++----- net/core/fib_rules.c | 2 +- net/core/net-sysfs.c | 4 ++-- net/ipv4/ipmr.c | 4 ++-- net/ipv4/route.c | 6 +++--- net/ipv4/udp.c | 7 +++---- net/ipv6/raw.c | 4 ++-- net/ipv6/udp.c | 2 +- net/mac80211/mesh_pathtbl.c | 4 ++-- net/netlink/af_netlink.c | 2 +- 10 files changed, 22 insertions(+), 23 deletions(-) diff --git a/net/core/dev.c b/net/core/dev.c index 9428766d0140..d22ffd722ee3 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2673,13 +2673,13 @@ static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, map = rcu_dereference(rxqueue->rps_map); if (map) { if (map->len == 1 && - !rcu_dereference_raw(rxqueue->rps_flow_table)) { + !rcu_access_pointer(rxqueue->rps_flow_table)) { tcpu = map->cpus[0]; if (cpu_online(tcpu)) cpu = tcpu; goto done; } - } else if (!rcu_dereference_raw(rxqueue->rps_flow_table)) { + } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) { goto done; } @@ -5727,8 +5727,8 @@ void netdev_run_todo(void) /* paranoia */ BUG_ON(netdev_refcnt_read(dev)); - WARN_ON(rcu_dereference_raw(dev->ip_ptr)); - WARN_ON(rcu_dereference_raw(dev->ip6_ptr)); + WARN_ON(rcu_access_pointer(dev->ip_ptr)); + WARN_ON(rcu_access_pointer(dev->ip6_ptr)); WARN_ON(dev->dn_ptr); if (dev->destructor) @@ -5932,7 +5932,7 @@ void free_netdev(struct net_device *dev) kfree(dev->_rx); #endif - kfree(rcu_dereference_raw(dev->ingress_queue)); + kfree(rcu_dereference_protected(dev->ingress_queue, 1)); /* Flush device addresses */ dev_addr_flush(dev); diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c index 0657b57df558..67c5c288cd80 100644 --- a/net/core/fib_rules.c +++ b/net/core/fib_rules.c @@ -545,7 +545,7 @@ static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule, frh->flags = rule->flags; if (rule->action == FR_ACT_GOTO && - rcu_dereference_raw(rule->ctarget) == NULL) + rcu_access_pointer(rule->ctarget) == NULL) frh->flags |= FIB_RULE_UNRESOLVED; if (rule->iifname[0]) { diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index b1ab887520a8..56e42ab7cbc6 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -712,13 +712,13 @@ static void rx_queue_release(struct kobject *kobj) struct rps_dev_flow_table *flow_table; - map = rcu_dereference_raw(queue->rps_map); + map = rcu_dereference_protected(queue->rps_map, 1); if (map) { RCU_INIT_POINTER(queue->rps_map, NULL); kfree_rcu(map, rcu); } - flow_table = rcu_dereference_raw(queue->rps_flow_table); + flow_table = rcu_dereference_protected(queue->rps_flow_table, 1); if (flow_table) { RCU_INIT_POINTER(queue->rps_flow_table, NULL); call_rcu(&flow_table->rcu, rps_dev_flow_table_release); diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c index f550285c977b..6164e982e0ef 100644 --- a/net/ipv4/ipmr.c +++ b/net/ipv4/ipmr.c @@ -1203,7 +1203,7 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsi return -ENOENT; if (optname != MRT_INIT) { - if (sk != rcu_dereference_raw(mrt->mroute_sk) && + if (sk != rcu_access_pointer(mrt->mroute_sk) && !capable(CAP_NET_ADMIN)) return -EACCES; } @@ -1230,7 +1230,7 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsi rtnl_unlock(); return ret; case MRT_DONE: - if (sk != rcu_dereference_raw(mrt->mroute_sk)) + if (sk != rcu_access_pointer(mrt->mroute_sk)) return -EACCES; return ip_ra_control(sk, 0, NULL); case MRT_ADD_VIF: diff --git a/net/ipv4/route.c b/net/ipv4/route.c index cb7efe0567f0..d6e32138f712 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -324,7 +324,7 @@ static struct rtable *rt_cache_get_first(struct seq_file *seq) struct rtable *r = NULL; for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) { - if (!rcu_dereference_raw(rt_hash_table[st->bucket].chain)) + if (!rcu_access_pointer(rt_hash_table[st->bucket].chain)) continue; rcu_read_lock_bh(); r = rcu_dereference_bh(rt_hash_table[st->bucket].chain); @@ -350,7 +350,7 @@ static struct rtable *__rt_cache_get_next(struct seq_file *seq, do { if (--st->bucket < 0) return NULL; - } while (!rcu_dereference_raw(rt_hash_table[st->bucket].chain)); + } while (!rcu_access_pointer(rt_hash_table[st->bucket].chain)); rcu_read_lock_bh(); r = rcu_dereference_bh(rt_hash_table[st->bucket].chain); } @@ -762,7 +762,7 @@ static void rt_do_flush(struct net *net, int process_context) if (process_context && need_resched()) cond_resched(); - rth = rcu_dereference_raw(rt_hash_table[i].chain); + rth = rcu_access_pointer(rt_hash_table[i].chain); if (!rth) continue; diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 1b5a19340a95..c1d5facab7c9 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1461,10 +1461,9 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) } } - if (rcu_dereference_raw(sk->sk_filter)) { - if (udp_lib_checksum_complete(skb)) - goto drop; - } + if (rcu_access_pointer(sk->sk_filter) && + udp_lib_checksum_complete(skb)) + goto drop; if (sk_rcvqueues_full(sk, skb)) diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c index 4f45dc9e4f5e..f34902f1ba33 100644 --- a/net/ipv6/raw.c +++ b/net/ipv6/raw.c @@ -372,9 +372,9 @@ void raw6_icmp_error(struct sk_buff *skb, int nexthdr, read_unlock(&raw_v6_hashinfo.lock); } -static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb) +static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb) { - if ((raw6_sk(sk)->checksum || rcu_dereference_raw(sk->sk_filter)) && + if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) && skb_checksum_complete(skb)) { atomic_inc(&sk->sk_drops); kfree_skb(skb); diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 29213b51c499..97e47f06e8b7 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -533,7 +533,7 @@ int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) } } - if (rcu_dereference_raw(sk->sk_filter)) { + if (rcu_access_pointer(sk->sk_filter)) { if (udp_lib_checksum_complete(skb)) goto drop; } diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c index 068ee6518254..dc7ae8d31aaf 100644 --- a/net/mac80211/mesh_pathtbl.c +++ b/net/mac80211/mesh_pathtbl.c @@ -843,6 +843,6 @@ void mesh_path_expire(struct ieee80211_sub_if_data *sdata) void mesh_pathtbl_unregister(void) { /* no need for locking during exit path */ - mesh_table_free(rcu_dereference_raw(mesh_paths), true); - mesh_table_free(rcu_dereference_raw(mpp_paths), true); + mesh_table_free(rcu_dereference_protected(mesh_paths, 1), true); + mesh_table_free(rcu_dereference_protected(mpp_paths, 1), true); } diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index 0a4db0211da0..4330db99fabf 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -1578,7 +1578,7 @@ int __netlink_change_ngroups(struct sock *sk, unsigned int groups) new = kzalloc(sizeof(*new) + NLGRPSZ(groups), GFP_ATOMIC); if (!new) return -ENOMEM; - old = rcu_dereference_raw(tbl->listeners); + old = rcu_dereference_protected(tbl->listeners, 1); memcpy(new->masks, old->masks, NLGRPSZ(tbl->groups)); rcu_assign_pointer(tbl->listeners, new); -- 2.30.2