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Commit a87b7dc9 authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

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: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4d85cd0c

include/net/ip6_fib.h

+4 −2
Original line number Diff line number Diff line
@@ -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;

}

net/ipv6/route.c

+10 −3
Original line number Diff line number Diff line
@@ -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)