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From: Ahmed Zaki <anzaki@gmail.com>
To: johannes@sipsolutions.net
Cc: linux-wireless@vger.kernel.org, Ahmed Zaki <anzaki@gmail.com>
Subject: [PATCH v2] mac80211: fix insane values that sometimes appear in inactive_time
Date: Thu, 31 Oct 2019 06:12:43 -0600	[thread overview]
Message-ID: <20191031121243.27694-1-anzaki@gmail.com> (raw)

In the first 5 minutes after boot (time of INITIAL_JIFFIES),
ieee80211_sta_last_active() returns zero if last_ack is zero. This
leads to "inactive time" showing jiffies_to_msecs(jiffies).

 # iw wlan0 station get fc:ec:da:64:a6:dd
 Station fc:ec:da:64:a6:dd (on wlan0)
	inactive time:	4294894049 ms
	.
	.
	connected time:	70 seconds

Fix by returning last_rx if last_ack == 0.

Signed-off-by: Ahmed Zaki <anzaki@gmail.com>
---
 net/mac80211/sta_info.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index bd11fef2139f..428866ff7c0a 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -2457,7 +2457,8 @@ unsigned long ieee80211_sta_last_active(struct sta_info *sta)
 {
 	struct ieee80211_sta_rx_stats *stats = sta_get_last_rx_stats(sta);
 
-	if (time_after(stats->last_rx, sta->status_stats.last_ack))
+	if (!sta->status_stats.last_ack ||
+		time_after(stats->last_rx, sta->status_stats.last_ack))
 		return stats->last_rx;
 	return sta->status_stats.last_ack;
 }
-- 
2.17.1


             reply	other threads:[~2019-10-31 12:13 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-31 12:12 Ahmed Zaki [this message]
2019-10-31 12:23 ` [PATCH v2] mac80211: fix insane values that sometimes appear in inactive_time Johannes Berg

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