[Ocfs2-devel] FW: [PATCH] workqueue: cancel_delayed_work() should return %NULL if work item is idle

[Joel Becker <jlbec@evilplan.org>]

Help me understand the issue.  Who broke this?  Do I need to push this
patch, or is someone else?

Thanks,
Joel

On Fri, Oct 19, 2012 at 10:56:42AM -0700, Dan Magenheimer wrote:
> FYI, it is likely that ocfs2 will not work on 3.7-rcN until
> the following one-line patch is merged, as the code in ramster
> that provoked it is directly leveraged from ocfs2 o2net.
> 
> > From: Tejun Heo [mailto:tj at kernel.org]
> > Sent: Thursday, October 18, 2012 5:39 PM
> > To: Dan Magenheimer
> > Cc: linux-kernel at vger.kernel.org; Konrad Wilk
> > Subject: [PATCH] workqueue: cancel_delayed_work() should return %NULL if work item is idle
> > 
> > From e65120fcfc1cb9697655d29ecd7982451c05d3c2 Mon Sep 17 00:00:00 2001
> > From: Dan Magenheimer <dan.magenheimer@oracle.com>
> > Date: Thu, 18 Oct 2012 16:31:37 -0700
> > 
> > 57b30ae77b ("workqueue: reimplement cancel_delayed_work() using
> > try_to_grab_pending()") made cancel_delayed_work() always return %true
> > unless someone else is also trying to cancel the work item, which is
> > broken - if the target work item is idle, the return value should be
> > %false.
> > 
> > try_to_grab_pending() indicates that the target work item was idle by
> > zero return value.  Use it for return.  Note that this brings
> > cancel_delayed_work() in line with __cancel_work_timer() in return
> > value handling.
> > 
> > Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com>
> > Signed-off-by: Tejun Heo <tj@kernel.org>
> > LKML-Reference: <444a6439-b1a4-4740-9e7e-bc37267cfe73@default>
> > ---
> >  kernel/workqueue.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> > index d951daa..042d221 100644
> > --- a/kernel/workqueue.c
> > +++ b/kernel/workqueue.c
> > @@ -2982,7 +2982,7 @@ bool cancel_delayed_work(struct delayed_work *dwork)
> > 
> >  	set_work_cpu_and_clear_pending(&dwork->work, work_cpu(&dwork->work));
> >  	local_irq_restore(flags);
> > -	return true;
> > +	return ret;
> >  }
> >  EXPORT_SYMBOL(cancel_delayed_work);
> > 
> > --
> > 1.7.7.3
> > 
> 
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