linux-kernel - Re: todays git: WARNING: at drivers/ata/libata-sff.c:1017 ata_sff_hsm

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Message-ID: <20090110135508.3d54007f@lxorguk.ukuu.org.uk>
Date:	Sat, 10 Jan 2009 13:55:08 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	Christian Borntraeger <borntraeger@...ibm.com>,
	linux-ide@...r.kernel.org, Jeff Garzik <jgarzik@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: todays git: WARNING: at drivers/ata/libata-sff.c:1017
 ata_sff_hsm_move+0x45e/0x750()

On Sat, 10 Jan 2009 16:01:44 +0300
Sergei Shtylyov <sshtylyov@...mvista.com> wrote:

> Hello.
> 
> Alan Cox wrote:
> 
> >>   That's the typical REQUEST SENSE command with 18-byte data length.
> 
> > Which means something has become horribly broken in the core libata stack.
> > An 18 byte inquiry would have 18 bytes as the *last* sg element. That
> 
>     Did you get me right? 18 bytes is the typical REQUEST SENSE payload 
> (libata requested 96 bytes), not INQUIRY. For the INQUIRY 36 bytes was 
> requested and received (divisible by 4).
>     And I doubt there can be more than one S/G segment with such lengths...

I am quite sure there cannot be - however the WARN clearly shows that we
got passed one.
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