br_timer_value() can be called locklessly, the expires field
could be changed concurrently.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
---
  net/bridge/br_stp_timer.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bridge/br_stp_timer.c b/net/bridge/br_stp_timer.c
index e5d453305381baa34225a144ac99e98f2a62d810..83cc9c6a3943508eb94d20ddc1b7e737a58d7abb 100644
--- a/net/bridge/br_stp_timer.c
+++ b/net/bridge/br_stp_timer.c

@@ -160,5 +160,5 @@ void br_stp_port_timer_init(struct net_bridge_port *p)
  unsigned long br_timer_value(const struct timer_list *timer)
  {
  	return timer_pending(timer)
-		? jiffies_delta_to_clock_t(timer->expires - jiffies) : 0;
+		? jiffies_delta_to_clock_t(READ_ONCE(timer->expires) - jiffies) : 0;
  }