[PATCH] mac80211: Fix station dump inactive time after sta connection

[Seevalamuthu Mariappan <seevalam@codeaurora.org>]

When USES_RSS is enabled, last_rx becomes zero in first few
minutes after sta connection in sta_get_last_rx_stats. This
leads to inactive time showing current jiffies in msecs.

Station 8c:fd:f0:02:10:dd (on wlan0)
        inactive time:  4294701656 ms
          .
          .
        connected time: 2 seconds

Fix this by avoid overwriting last_rx with percpu_stat's last_rx
if it is zero.

Signed-off-by: Seevalamuthu Mariappan <seevalam@codeaurora.org>
---
 net/mac80211/sta_info.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index f8d5c25..df40c0a 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -2089,6 +2089,9 @@ u8 sta_info_tx_streams(struct sta_info *sta)
 
 		cpustats = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
 
+		if (!cpustats->last_rx)
+			continue;
+
 		if (time_after(cpustats->last_rx, stats->last_rx))
 			stats = cpustats;
 	}
-- 
1.9.1