linux-kernel - Re: [PATCH] Re: [bug] ata subsystem related crash with latest -git

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Message-ID: <20071018145238.GA5565@lixom.net>
Date:	Thu, 18 Oct 2007 09:52:38 -0500
From:	Olof Johansson <olof@...om.net>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Jens Axboe <jens.axboe@...cle.com>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Tejun Heo <htejun@...il.com>,
	Brian King <brking@...ux.vnet.ibm.com>
Subject: Re: [PATCH] Re: [bug] ata subsystem related crash with latest -git

On Thu, Oct 18, 2007 at 06:42:46AM -0400, Jeff Garzik wrote:
> Jens Axboe wrote:
>> On Thu, Oct 18 2007, Jeff Garzik wrote:
>>> Jens Axboe wrote:
>>>> That should work as well. WRT ata_sg_is_last(), if we go ahead with my
>>>> recent sg chaining updates, we can keep the test as it would be a single
>>>> conditional and not require any looping.
>>>> Let me know when you have tested this!
>>> The patch I attached to the last email got both sata_mv test boxes 
>>> working reliably (so far).
>>>
>>> I worked up a patch that kills ata_sg_is_last() (plus the 
>>> max_phys_segments sata_mv fix), see attached.  I'm thinking this is what 
>>> I like to see in upstream.
>> Great!
>>> Of course, this doesn't explain why ata_sg_is_last() was broken, but 
>>> since it's working _and_ slightly more efficient, I don't really care :)
>> Tomo and I agreed to kill sg_last() a few days ago anyways, so this is
>> perfectly fine with me.
>
> Yep, the [attached] patch that kills ata_sg_is_last() is working here on 
> both machines that were previously croaking.
>
> It would be nice to get pdc_adma, sata_sil24 and ipr it-works test done, 
> but IMO the patch is pretty straightforward and should be OK.

Tested-by: Olof Johansson <olof@...om.net>

Looks ok on SATA_SIL24 and SATA_MV here on PPC (together with Jens' latest
patch). Both barfed before.


Thanks!

-Olof
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