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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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5
include/linux/inetdevice.h
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@ -52,9 +52,8 @@ struct in_device {
atomic_t refcnt;
int dead;
struct in_ifaddr *ifa_list; /* IP ifaddr chain */
rwlock_t mc_list_lock;
struct ip_mc_list *mc_list; /* IP multicast filter chain */
int mc_count; /* Number of installed mcasts */
struct ip_mc_list __rcu *mc_list; /* IP multicast filter chain */
int mc_count; /* Number of installed mcasts */
spinlock_t mc_tomb_lock;
struct ip_mc_list *mc_tomb;
unsigned long mr_v1_seen;