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ipv6: replace write lock with read lock when get route info 

geting route info does not write rt->rt6i_table, so replace
write lock with read lock

Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Li RongQing 2012-09-11 21:59:01 +00:00 committed by David S. Miller
parent fb0af4c74f
commit 5744dd9b71
2 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
net/ipv6/addrconf.c
View File

@ -1708,7 +1708,7 @@ static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
if (table == NULL)
return NULL;
write_lock_bh(&table->tb6_lock);
read_lock_bh(&table->tb6_lock);
fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
if (!fn)
goto out;
@ -1723,7 +1723,7 @@ static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
break;
}
out:
write_unlock_bh(&table->tb6_lock);
read_unlock_bh(&table->tb6_lock);
return rt;
}

8
net/ipv6/route.c
View File

@ -1837,7 +1837,7 @@ static struct rt6_info *rt6_get_route_info(struct net *net,
if (!table)
return NULL;
write_lock_bh(&table->tb6_lock);
read_lock_bh(&table->tb6_lock);
fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
if (!fn)
goto out;
@ -1853,7 +1853,7 @@ static struct rt6_info *rt6_get_route_info(struct net *net,
break;
}
out:
write_unlock_bh(&table->tb6_lock);
read_unlock_bh(&table->tb6_lock);
return rt;
}
@ -1896,7 +1896,7 @@ struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_dev
if (!table)
return NULL;
write_lock_bh(&table->tb6_lock);
read_lock_bh(&table->tb6_lock);
for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
if (dev == rt->dst.dev &&
((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
@ -1905,7 +1905,7 @@ struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_dev
}
if (rt)
dst_hold(&rt->dst);
write_unlock_bh(&table->tb6_lock);
read_unlock_bh(&table->tb6_lock);
return rt;
}