linux-kernel - Re: boot failure with 4.13.0-rc6 due to ATA errors

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Date:   Tue, 29 Aug 2017 08:55:05 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:     David Ahern <dsahern@...il.com>, Christoph Hellwig <hch@....de>,
        linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Robert Elliott <elliott@....com>
Subject: Re: boot failure with 4.13.0-rc6 due to ATA errors

Hello, Henrique.

On Tue, Aug 29, 2017 at 12:51:02PM -0300, Henrique de Moraes Holschuh wrote:
> > > > ATA-8 and later mirrors the TRUSTED COMPUTING SUPPORTED bit in word 48 of
> > > > the IDENTIFY DEVICE data.  Check this before issuing a READ LOG PAGE
> > > > command to avoid issues with buggy devices.  The only downside is that
> > > > we can't support Security Send / Receive for a device with an older
> > > > revision due to the conflicting use of this field in earlier
> > > > specifications.
> > 
> > Christoph, I'm gonna revert the horkage patch and apply this one.  If
> > you can think of a better way to do this, please let me know.
> 
> The one thing that comes to mind would be an additional patch to allow
> people with ATA-7 to bypass the identify device data, and rely just on
> the read log page check, based on a kernel command line parameter.
> 
> If we get enough sucessful reports to make it worth it, an whitelist
> could be added...

If the ones we miss are the ones based on old revisions, does it
matter?  If we have to, we can just whitelist those devices and I
don't expect there to be many.

Thanks.

-- 
tejun