From: Patrick McHardy <kaber@trash.net>
Date: Mon, 9 Jul 2007 22:30:19 +0000 (-0700)
Subject: [NET]: Fix gen_estimator timer removal race
X-Git-Tag: v2.6.23-rc1~1109^2~26
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=6b25d30bf112370a12d05c3c0fd43732985dab01;p=linux-2.6-omap-h63xx.git

[NET]: Fix gen_estimator timer removal race

As noticed by Jarek Poplawski <jarkao2@o2.pl>, the timer removal in
gen_kill_estimator races with the timer function rearming the timer.

Check whether the timer list is empty before rearming the timer
in the timer function to fix this.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Acked-by: Jarek Poplawski <jarkao2@o2.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/gen_estimator.c b/net/core/gen_estimator.c
index 17daf4c9f79..cc84d8d8a3c 100644
--- a/net/core/gen_estimator.c
+++ b/net/core/gen_estimator.c
@@ -128,7 +128,8 @@ static void est_timer(unsigned long arg)
 		spin_unlock(e->stats_lock);
 	}
 
-	mod_timer(&elist[idx].timer, jiffies + ((HZ<<idx)/4));
+	if (elist[idx].list != NULL)
+		mod_timer(&elist[idx].timer, jiffies + ((HZ<<idx)/4));
 	read_unlock(&est_lock);
 }