From: Stephen Hemminger <shemminger@osdl.org>
To: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Subject: [PATCH] net_sched: potential jiffy wrap bug in dev_watchdog
Date: Mon, 15 May 2006 16:28:58 -0700 [thread overview]
Message-ID: <20060515162858.35eee987@localhost.localdomain> (raw)
There is a potential jiffy wraparound bug in the transmit watchdog
that is easily avoided by using time_after().
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
--- linux-2.6.orig/net/sched/sch_generic.c
+++ linux-2.6/net/sched/sch_generic.c
@@ -193,8 +193,10 @@ static void dev_watchdog(unsigned long a
netif_running(dev) &&
netif_carrier_ok(dev)) {
if (netif_queue_stopped(dev) &&
- (jiffies - dev->trans_start) > dev->watchdog_timeo) {
- printk(KERN_INFO "NETDEV WATCHDOG: %s: transmit timed out\n", dev->name);
+ time_after(jiffies, dev->trans_start + dev->watchdog_timeo)) {
+
+ printk(KERN_INFO "NETDEV WATCHDOG: %s: transmit timed out\n",
+ dev->name);
dev->tx_timeout(dev);
}
if (!mod_timer(&dev->watchdog_timer, jiffies + dev->watchdog_timeo))
next reply other threads:[~2006-05-15 23:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-15 23:28 Stephen Hemminger [this message]
2006-05-16 5:12 ` [PATCH] net_sched: potential jiffy wrap bug in dev_watchdog David S. Miller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20060515162858.35eee987@localhost.localdomain \
--to=shemminger@osdl.org \
--cc=davem@davemloft.net \
--cc=netdev@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).