ipv6: use timer pending

[ Upstream commit 847499ce ]

This fixes the bridge reference count problem and cleanups ipv6 FIB
timer management.  Don't use expires field, because it is not a proper
way to test, instead use timer_pending().
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

net/ipv6/ip6_fib.c

@@ -663,7 +663,7 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
 
 static __inline__ void fib6_start_gc(struct net *net, struct rt6_info *rt)
 {
-	if (net->ipv6.ip6_fib_timer->expires == 0 &&
+	if (!timer_pending(net->ipv6.ip6_fib_timer) &&
 	    (rt->rt6i_flags & (RTF_EXPIRES|RTF_CACHE)))
 		mod_timer(net->ipv6.ip6_fib_timer, jiffies +
 			  net->ipv6.sysctl.ip6_rt_gc_interval);
@@ -671,7 +671,7 @@ static __inline__ void fib6_start_gc(struct net *net, struct rt6_info *rt)
 
 void fib6_force_start_gc(struct net *net)
 {
-	if (net->ipv6.ip6_fib_timer->expires == 0)
+	if (!timer_pending(net->ipv6.ip6_fib_timer))
 		mod_timer(net->ipv6.ip6_fib_timer, jiffies +
 			  net->ipv6.sysctl.ip6_rt_gc_interval);
 }