linux-kernel - Re: ata: BUG in ata_sff_hsm

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Message-ID: <20160129202440.GB4534@mtj.duckdns.org>
Date:	Fri, 29 Jan 2016 15:24:40 -0500
From:	Tejun Heo <tj@...nel.org>
To:	David Milburn <dmilburn@...hat.com>
Cc:	Dmitry Vyukov <dvyukov@...gle.com>,
	syzkaller <syzkaller@...glegroups.com>,
	linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Jeff Garzik <jgarzik@...hat.com>,
	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: Re: ata: BUG in ata_sff_hsm_move

Hello, David.

On Fri, Jan 29, 2016 at 12:14:42PM -0600, David Milburn wrote:
> Can ata_sff_hsm_move grab the lock and save off the task_state,
> like this patch?

It's not just the task_state.  Everything the polling path is doing is
dangerous.  It's all pretty confused.

Thanks.

-- 
tejun