linux-kernel - Re: ohci : strange looking use of round_jiffies

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1206546405.2931.20.camel@castor.localdomain>
Date:	Wed, 26 Mar 2008 15:46:45 +0000
From:	Richard Kennedy <richard@....demon.co.uk>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	dbrownell@...rs.sourceforge.net,
	linux-usb <linux-usb@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: ohci : strange looking use of round_jiffies_relative. possible
	bug ?


On Wed, 2008-03-26 at 11:37 -0400, Alan Stern wrote:
> On Wed, 26 Mar 2008, Richard Kennedy wrote:
> 
> > I was looking at the uses of round_jiffies and noticed that the ohci
> > unlink_watchdog_func() calls 
> > mod_timer(&ohci->unlink_watchdog, round_jiffies_relative(HZ));
> > 
> > Which looks a bit strange as it will set the timer to 0 <= t < HZ.
> > Reading the comments I think that is really is expecting to setup timer
> > to (now + 1s)
> > 
> > mod_timer(&ohci->unlink_watchdog, round_jiffies(jiffies + HZ));
> > 
> > If this is not true then perhaps it needs a comment to explain what it
> > _is_ trying to do, because it's got me baffled ;)
> 
> I'd say it's a bug.  Or rather a pair of bugs, since that mod_timer() 
> call appears in two places.
> 
> Alan Stern
> 
Thanks. In that case I'll post a patch.
Richard 

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/