[PATCH 4.9 04/61] net sched: fix reporting the first-time use timestamp

[Greg Kroah-Hartman]

From: Roman Mashak <m...@mojatatu.com>

[ Upstream commit b15e62631c5f19fea9895f7632dae9c1b27fe0cd ]

When a new action is installed, firstuse field of 'tcf_t' is explicitly set
to 0. Value of zero means "new action, not yet used"; as a packet hits the
action, 'firstuse' is stamped with the current jiffies value.

tcf_tm_dump() should return 0 for firstuse if action has not yet been hit.

Fixes: 48d8ee1694dd ("net sched actions: aggregate dumping of actions timeinfo")
Cc: Jamal Hadi Salim <j...@mojatatu.com>
Signed-off-by: Roman Mashak <m...@mojatatu.com>
Acked-by: Jamal Hadi Salim <j...@mojatatu.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 include/net/act_api.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/include/net/act_api.h
+++ b/include/net/act_api.h
@@ -94,7 +94,8 @@ static inline void tcf_tm_dump(struct tc
 {
        dtm->install = jiffies_to_clock_t(jiffies - stm->install);
        dtm->lastuse = jiffies_to_clock_t(jiffies - stm->lastuse);
-       dtm->firstuse = jiffies_to_clock_t(jiffies - stm->firstuse);
+       dtm->firstuse = stm->firstuse ?
+               jiffies_to_clock_t(jiffies - stm->firstuse) : 0;
        dtm->expires = jiffies_to_clock_t(stm->expires);
 }