linux-kernel - Re: [PATCH] powerpc/eeh: remove eeh_event

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Date:	Tue, 16 Aug 2011 16:38:50 -0500
From:	Linas Vepstas <linasvepstas@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Matt Fleming <matt@...sole-pimps.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/eeh: remove eeh_event_handler()->daemonize()

On 16 August 2011 14:29, Tejun Heo <tj@...nel.org> wrote:
> Hello,
>
> On Tue, Aug 16, 2011 at 02:24:12PM -0500, Linas Vepstas wrote:
>> BTW, if someone wants to tackle a big, difficult project, one would be
>> to untangle the mess that happens when the hardware underneath an
>> active block device dies.  Currently, the kernel will deadlock in
>> umpteen zillion places waiting for blocks and files that will never
>> arrive.
>
> Umm... that has been working fine for SCSI and ATA for years now.
> Just aborting pending commands and freeing the device should do it.
> Drivers need to take care of driver specific resources (per-req and
> per-dev) but that's not different from aborting timed out commands.
> What's missing for your use case?

Sorry, I guess I'm out-of-date; its been far more than a few years since
I last tried this :-) The use case was eeh recovery, where the hardware was
so hosed that it wouldn't recover.  The test cases were whatever it was that
the test team could throw at the system.

--linas

--linas
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