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[RTNETLINK]: Remove unnecessary locking in dump callbacks

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Since we're now holding the rtnl during the entire dump operation, we can
remove additional locking for rtnl protected data. This patch does that
for all simple cases (dev_base_lock for dev_base walking, RCU protection
for FIB rule dumping).

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-04-16 17:00:53 -07:00 committed by David S. Miller
parent 1c2d670f36
commit 6313c1e099
6 changed files with 3 additions and 22 deletions
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2
net/bridge/br_netlink.c
View File

@ -109,7 +109,6 @@ static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
struct net_device *dev;
int idx;
read_lock(&dev_base_lock);
for (dev = dev_base, idx = 0; dev; dev = dev->next) {
/* not a bridge port */
if (dev->br_port == NULL || idx < cb->args[0])
@ -122,7 +121,6 @@ static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
skip:
++idx;
}
read_unlock(&dev_base_lock);
cb->args[0] = idx;

4
net/core/fib_rules.c
View File

@ -495,8 +495,7 @@ static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
int idx = 0;
struct fib_rule *rule;
rcu_read_lock();
list_for_each_entry_rcu(rule, ops->rules_list, list) {
list_for_each_entry(rule, ops->rules_list, list) {
if (idx < cb->args[1])
goto skip;
@ -507,7 +506,6 @@ static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
skip:
idx++;
}
rcu_read_unlock();
cb->args[1] = idx;
rules_ops_put(ops);

2
net/core/rtnetlink.c
View File

@ -543,7 +543,6 @@ static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
int s_idx = cb->args[0];
struct net_device *dev;
read_lock(&dev_base_lock);
for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
if (idx < s_idx)
continue;
@ -552,7 +551,6 @@ static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
break;
}
read_unlock(&dev_base_lock);
cb->args[0] = idx;
return skb->len;

3
net/decnet/dn_dev.c
View File

@ -799,7 +799,6 @@ static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
skip_ndevs = cb->args[0];
skip_naddr = cb->args[1];
read_lock(&dev_base_lock);
for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
if (idx < skip_ndevs)
continue;
@ -824,8 +823,6 @@ static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
}
}
done:
read_unlock(&dev_base_lock);
cb->args[0] = idx;
cb->args[1] = dn_idx;

12
net/ipv4/devinet.c
View File

@ -1182,17 +1182,13 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
int s_ip_idx, s_idx = cb->args[0];
s_ip_idx = ip_idx = cb->args[1];
read_lock(&dev_base_lock);
for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
if (idx < s_idx)
continue;
if (idx > s_idx)
s_ip_idx = 0;
rcu_read_lock();
if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
rcu_read_unlock();
if ((in_dev = __in_dev_get_rtnl(dev)) == NULL)
continue;
}
for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
ifa = ifa->ifa_next, ip_idx++) {
@ -1200,16 +1196,12 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
continue;
if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq,
RTM_NEWADDR, NLM_F_MULTI) <= 0) {
rcu_read_unlock();
RTM_NEWADDR, NLM_F_MULTI) <= 0)
goto done;
}
}
rcu_read_unlock();
}
done:
read_unlock(&dev_base_lock);
cb->args[0] = idx;
cb->args[1] = ip_idx;

2
net/ipv6/addrconf.c
View File

@ -3224,7 +3224,6 @@ static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
s_idx = cb->args[0];
s_ip_idx = ip_idx = cb->args[1];
read_lock(&dev_base_lock);
for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
if (idx < s_idx)
@ -3286,7 +3285,6 @@ done:
read_unlock_bh(&idev->lock);
in6_dev_put(idev);
}
read_unlock(&dev_base_lock);
cb->args[0] = idx;
cb->args[1] = ip_idx;
return skb->len;