linux-kernel - Re: HPA patches

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Message-ID: <20070328212829.GA14263@srcf.ucam.org>
Date:	Wed, 28 Mar 2007 22:28:29 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	kyle@...onical.com
Subject: Re: HPA patches

On Wed, Mar 28, 2007 at 10:54:31PM +0100, Alan Cox wrote:

> I wonder if the firmware is dying when we ask the disk to go zero sized
> rather than erroring politely. I'm not sure hth HPA sectors can come back
> as zero but we can be fairly sure 0 means "no HPA" in this case I guess ?

No, it seems to be looking at 0 because ata_read_native_max_address_ext 
returns 0 in the error case - the error that ata_exec_internal generates 
seems to be AC_ERR_HSM. Since 0 isn't > the size reported, we'll never 
try to resize it anyway, judging by ata_hpa_resize - that is, it seems 
to be the ata_read_native_max_address_ext call that breaks it.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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