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bridge: vlan: use rcu for vlan_list traversal in br_fill_ifinfo

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br_fill_ifinfo is called by br_ifinfo_notify which can be called from
many contexts with different locks held, sometimes it relies upon
bridge's spinlock only which is a problem for the vlan code, so use
explicitly rcu for that to avoid problems.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2015-10-12 21:47:03 +02:00 committed by David S. Miller
parent 907b1e6e83
commit e9c953eff7
1 changed files with 13 additions and 8 deletions
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21
net/bridge/br_netlink.c
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@ -253,7 +253,7 @@ static int br_fill_ifvlaninfo_compressed(struct sk_buff *skb,
* if vlaninfo represents a range
*/
pvid = br_get_pvid(vg);
list_for_each_entry(v, &vg->vlan_list, vlist) {
list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
flags = 0;
if (!br_vlan_should_use(v))
continue;
@ -303,7 +303,7 @@ static int br_fill_ifvlaninfo(struct sk_buff *skb,
u16 pvid;
pvid = br_get_pvid(vg);
list_for_each_entry(v, &vg->vlan_list, vlist) {
list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
if (!br_vlan_should_use(v))
continue;
@ -386,22 +386,27 @@ static int br_fill_ifinfo(struct sk_buff *skb,
struct nlattr *af;
int err;
/* RCU needed because of the VLAN locking rules (rcu || rtnl) */
rcu_read_lock();
if (port)
vg = nbp_vlan_group(port);
vg = nbp_vlan_group_rcu(port);
else
vg = br_vlan_group(br);
vg = br_vlan_group_rcu(br);
if (!vg || !vg->num_vlans)
if (!vg || !vg->num_vlans) {
rcu_read_unlock();
goto done;
}
af = nla_nest_start(skb, IFLA_AF_SPEC);
if (!af)
if (!af) {
rcu_read_unlock();
goto nla_put_failure;
}
if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)
err = br_fill_ifvlaninfo_compressed(skb, vg);
else
err = br_fill_ifvlaninfo(skb, vg);
rcu_read_unlock();
if (err)
goto nla_put_failure;
nla_nest_end(skb, af);