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net/ipv6: Move rcu locking to callers of fib6_get_cookie_safe 

A later patch protects 'from' in rt6_info and this simplifies the
locking needed by it.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2018-04-20 15:38:00 -07:00 committed by David S. Miller
parent 4d85cd0c2a
commit a87b7dc9f7
2 changed files with 14 additions and 5 deletions
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6
include/net/ip6_fib.h
View File

@ -234,7 +234,6 @@ static inline bool fib6_get_cookie_safe(const struct fib6_info *f6i,
struct fib6_node *fn;
bool status = false;
rcu_read_lock();
fn = rcu_dereference(f6i->fib6_node);
if (fn) {
@ -244,7 +243,6 @@ static inline bool fib6_get_cookie_safe(const struct fib6_info *f6i,
status = true;
}
rcu_read_unlock();
return status;
}
@ -252,10 +250,14 @@ static inline u32 rt6_get_cookie(const struct rt6_info *rt)
{
u32 cookie = 0;
rcu_read_lock();
if (rt->rt6i_flags & RTF_PCPU ||
(unlikely(!list_empty(&rt->rt6i_uncached)) && rt->from))
fib6_get_cookie_safe(rt->from, &cookie);
rcu_read_unlock();
return cookie;
}

13
net/ipv6/route.c
View File

@ -2159,9 +2159,12 @@ static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
{
struct dst_entry *dst_ret;
struct rt6_info *rt;
rt = (struct rt6_info *) dst;
rt = container_of(dst, struct rt6_info, dst);
rcu_read_lock();
/* All IPV6 dsts are created with ->obsolete set to the value
* DST_OBSOLETE_FORCE_CHK which forces validation calls down
@ -2170,9 +2173,13 @@ static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
if (rt->rt6i_flags & RTF_PCPU ||
(unlikely(!list_empty(&rt->rt6i_uncached)) && rt->from))
return rt6_dst_from_check(rt, cookie);
dst_ret = rt6_dst_from_check(rt, cookie);
else
return rt6_check(rt, cookie);
dst_ret = rt6_check(rt, cookie);
rcu_read_unlock();
return dst_ret;
}
static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)