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| author | Yan Zheng <yanzheng@21cn.com> | 2005-11-20 13:42:20 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2005-11-20 13:42:20 -0800 |
| commit | 5d5780df23537ad0db72267fe11103d2c23d9b2a (patch) | |
| tree | 3a442b265c3494072d4cdf15c8d3a38ada33a734 /net/ipv6/addrconf.c | |
| parent | 4909724b5dee8fb7c52bbe90afa40c65b17be9eb (diff) | |
| download | lwn-5d5780df23537ad0db72267fe11103d2c23d9b2a.tar.gz lwn-5d5780df23537ad0db72267fe11103d2c23d9b2a.zip | |
[IPV6]: Acquire addrconf_hash_lock for read in addrconf_verify(...)
addrconf_verify(...) only traverse address hash table when
addrconf_hash_lock is held for writing, and it may hold
addrconf_hash_lock for a long time. So I think it's better to acquire
addrconf_hash_lock for reading instead of writing
Signed-off-by: Yan Zheng <yanzheng@21cn.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/addrconf.c')
| -rw-r--r-- | net/ipv6/addrconf.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 56a09a4ac410..a16064ba0caf 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -2627,7 +2627,7 @@ static void addrconf_verify(unsigned long foo) for (i=0; i < IN6_ADDR_HSIZE; i++) { restart: - write_lock(&addrconf_hash_lock); + read_lock(&addrconf_hash_lock); for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { unsigned long age; #ifdef CONFIG_IPV6_PRIVACY @@ -2649,7 +2649,7 @@ restart: if (age >= ifp->valid_lft) { spin_unlock(&ifp->lock); in6_ifa_hold(ifp); - write_unlock(&addrconf_hash_lock); + read_unlock(&addrconf_hash_lock); ipv6_del_addr(ifp); goto restart; } else if (age >= ifp->prefered_lft) { @@ -2668,7 +2668,7 @@ restart: if (deprecate) { in6_ifa_hold(ifp); - write_unlock(&addrconf_hash_lock); + read_unlock(&addrconf_hash_lock); ipv6_ifa_notify(0, ifp); in6_ifa_put(ifp); @@ -2686,7 +2686,7 @@ restart: in6_ifa_hold(ifp); in6_ifa_hold(ifpub); spin_unlock(&ifp->lock); - write_unlock(&addrconf_hash_lock); + read_unlock(&addrconf_hash_lock); ipv6_create_tempaddr(ifpub, ifp); in6_ifa_put(ifpub); in6_ifa_put(ifp); @@ -2703,7 +2703,7 @@ restart: spin_unlock(&ifp->lock); } } - write_unlock(&addrconf_hash_lock); + read_unlock(&addrconf_hash_lock); } addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; |