linux-kernel - libata-core.c: unsafe cancel_delayed

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Message-ID: <20070501225654.GA190@tv-sign.ru>
Date:	Wed, 2 May 2007 02:56:54 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: libata-core.c: unsafe cancel_delayed_work() usage?

On 04/27, Andrew Morton wrote:
>
> It'd be good if people could take some time to sit down and re-review the
> code which we presently have.  I plan on sending it all off for 2.6.22 and
> there might be some glitches but it seems to have a good track record so
> far.

Alan, the usage of cancel_delayed_work() in drivers/ata/libata-core.c looks
suspicious to me, both ->hotplug_task and ->port_task can re-arm themselves,
so cancel_delayed_work + flush_workqueue (or cancel_work_sync) is not enough.

Could you confirm/nack my understanding?

Oleg.

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