[BRIDGE]: Round off STP perodic timers.

Peroidic STP timers don't have to be exact.  The hold timer runs at
1HZ, and the hello timer normally runs at 2HZ; save power by aligning
it them to next second.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 3 insertions, 2 deletions

diff --git a/net/bridge/br_stp.c b/net/bridge/br_stp.c
index 0e035d6162cc..e38034aa56f5 100644
--- a/net/bridge/br_stp.c
+++ b/net/bridge/br_stp.c
@@ -178,7 +178,8 @@ void br_transmit_config(struct net_bridge_port *p)
                 br_send_config_bpdu(p, &bpdu);
                 p->topology_change_ack = 0;
                 p->config_pending = 0;
-                mod_timer(&p->hold_timer, jiffies + BR_HOLD_TIME);
+                mod_timer(&p->hold_timer,
+                          round_jiffies(jiffies + BR_HOLD_TIME));
         }
 }
 
diff --git a/net/bridge/br_stp_timer.c b/net/bridge/br_stp_timer.c
index 24e0ca4a3131..77f5255e6915 100644
--- a/net/bridge/br_stp_timer.c
+++ b/net/bridge/br_stp_timer.c
@@ -42,7 +42,7 @@ static void br_hello_timer_expired(unsigned long arg)
         if (br->dev->flags & IFF_UP) {
                 br_config_bpdu_generation(br);
 
-                mod_timer(&br->hello_timer, jiffies + br->hello_time);
+                mod_timer(&br->hello_timer, round_jiffies(jiffies + br->hello_time));
         }
         spin_unlock(&br->lock);
 }