netdev - Re: rose timer t error displayed in /proc/net/rose

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Date:   Mon, 1 Aug 2022 02:39:01 +0200
From:   Francois Romieu <romieu@...zoreil.com>
To:     Bernard f6bvp <f6bvp@...e.fr>
Cc:     Eric Dumazet <edumazet@...gle.com>, linux-hams@...r.kernel.org,
        Thomas Osterried DL9SAU <thomas@...erg.in-berlin.de>,
        netdev@...r.kernel.org
Subject: Re: rose timer t error displayed in /proc/net/rose

Bernard f6bvp <f6bvp@...e.fr> :
> Rose proc timer t error
> 
> Timer t is decremented one by one during normal operations.
> 
> When decreasing from 1 to 0 it displays a very large number until next clock
> tic as demonstrated below.
> 
> t1, t2 and t3 are correctly handled.

"t" is ax25_display_timer(&rose->timer) / HZ whereas "tX" are rose->tX / HZ.

ax25_display_timer() does not like jiffies > timer->expires (and it should
probably return plain seconds btw).

You may try the hack below.

diff --git a/net/ax25/ax25_timer.c b/net/ax25/ax25_timer.c
index 85865ebfdfa2..b77433fff0c9 100644
--- a/net/ax25/ax25_timer.c
+++ b/net/ax25/ax25_timer.c
@@ -108,10 +108,9 @@ int ax25_t1timer_running(ax25_cb *ax25)
 
 unsigned long ax25_display_timer(struct timer_list *timer)
 {
-	if (!timer_pending(timer))
-		return 0;
+	long delta = timer->expires - jiffies;
 
-	return timer->expires - jiffies;
+	return jiffies_delta_to_clock_t(delta) * HZ;
 }
 
 EXPORT_SYMBOL(ax25_display_timer);