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

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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 

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