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netfilter: ipset: references are protected by rwlock instead of mutex

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The timeout variant of the list:set type must reference the member sets.
However, its garbage collector runs at timer interrupt so the mutex
protection of the references is a no go. Therefore the reference protection
is converted to rwlock.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Jozsef Kadlecsik
2011-04-04 15:19:25 +02:00
committed by Patrick McHardy
parent 512d06b5b6
commit 2f9f28b212
7 changed files with 73 additions and 56 deletions
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2
include/linux/netfilter/ipset/ip_set.h
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@@ -293,7 +293,7 @@ struct ip_set {
/* Lock protecting the set data */
rwlock_t lock;
/* References to the set */
atomic_t ref;
u32 ref;
/* The core set type */
struct ip_set_type *type;
/* The type variant doing the real job */

3
include/linux/netfilter/ipset/ip_set_ahash.h
View File

@@ -515,8 +515,7 @@ type_pf_head(struct ip_set *set, struct sk_buff *skb)
if (h->netmask != HOST_MASK)
NLA_PUT_U8(skb, IPSET_ATTR_NETMASK, h->netmask);
#endif
NLA_PUT_NET32(skb, IPSET_ATTR_REFERENCES,
htonl(atomic_read(&set->ref) - 1));
NLA_PUT_NET32(skb, IPSET_ATTR_REFERENCES, htonl(set->ref - 1));
NLA_PUT_NET32(skb, IPSET_ATTR_MEMSIZE, htonl(memsize));
if (with_timeout(h->timeout))
NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT, htonl(h->timeout));