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igmp: RCU conversion of in_dev->mc_list

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in_dev->mc_list is protected by one rwlock (in_dev->mc_list_lock).

This can easily be converted to a RCU protection.

Writers hold RTNL, so mc_list_lock is removed, not replaced by a
spinlock.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Cypher Wu <cypher.w@gmail.com>
Cc: Américo Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-11-12 05:46:50 +00:00 • committed by David S. Miller
parent f5539b5bfa
commit 1d7138de87
4 changed files with 115 additions and 127 deletions
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12
include/linux/igmp.h
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@ -167,10 +167,10 @@ struct ip_sf_socklist {
*/
struct ip_mc_socklist {
struct ip_mc_socklist *next;
struct ip_mc_socklist __rcu *next_rcu;
struct ip_mreqn multi;
unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */
struct ip_sf_socklist *sflist;
struct ip_sf_socklist __rcu *sflist;
struct rcu_head rcu;
};
@ -186,11 +186,14 @@ struct ip_sf_list {
struct ip_mc_list {
struct in_device *interface;
__be32 multiaddr;
unsigned int sfmode;
struct ip_sf_list *sources;
struct ip_sf_list *tomb;
unsigned int sfmode;
unsigned long sfcount[2];
struct ip_mc_list *next;
union {
struct ip_mc_list *next;
struct ip_mc_list __rcu *next_rcu;
};
struct timer_list timer;
int users;
atomic_t refcnt;
@ -201,6 +204,7 @@ struct ip_mc_list {
char loaded;
unsigned char gsquery; /* check source marks? */
unsigned char crcount;
struct rcu_head rcu;
};
/* V3 exponential field decoding */