netdev - Re: [Bonding-devel] [PATCH] bonding: cancel_delayed_work() -> cancel_delayed_work

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Message-ID: <20091217184017.GA2578@ami.dom.local>
Date:	Thu, 17 Dec 2009 19:40:17 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Jay Vosburgh <fubar@...ibm.com>
Cc:	Johannes Berg <johannes@...solutions.net>,
	Mikhail Markine <markine@...gle.com>, netdev@...r.kernel.org,
	bonding-devel@...ts.sourceforge.net,
	Petri Gynther <pgynther@...gle.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [Bonding-devel] [PATCH] bonding: cancel_delayed_work() ->
 cancel_delayed_work_sync()

On Thu, Dec 17, 2009 at 08:12:53AM -0800, Jay Vosburgh wrote:
> 	There's already logic in the monitors (bond_mii_monitor, et al)
> to check a sentinel (kill_timers) and do nothing (not acquire rtnl) and
> return.

Btw, this check should be repeated if bond->lock is given back and
re-acquired. I can't see these kill_timers used in bond_sysfs.c though.

> 	What exactly is the nature of the race that doing cancel..sync
> is fixing?  The bond_close function sets kill_timers prior to calling
> the cancel functions, so the monitor function might run once, but it
> should do nothing.

I guess there is a problem with destructions, but I hope Mikhail will
give more details.

Jarek P.
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