linux-kernel - Re: [tpmdd-devel] [backport v4.9] tpm_tis: use default timeout value if chip reports it as zero

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Message-ID: <20170419152908.vq55so4mtqyp6sc7@intel.com>
Date:   Wed, 19 Apr 2017 18:29:08 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     Greg KH <greg@...ah.com>, tpmdd-devel@...ts.sourceforge.net,
        linux-security-module@...r.kernel.org,
        "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>,
        stable@...r.kernel.org, Peter Huewe <peterhuewe@....de>,
        Marcel Selhorst <tpmdd@...horst.net>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [tpmdd-devel] [backport v4.9] tpm_tis: use default timeout value
 if chip reports it as zero

On Sun, Apr 16, 2017 at 09:14:29PM +0200, Paul Menzel wrote:
> Dear Greg,
> 
> 
> On 2017-04-15 22:50, Greg KH wrote:
> > On Sat, Apr 15, 2017 at 06:26:22PM +0300, Jarkko Sakkinen wrote:
> > > From: "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
> > > 
> > > Since commit 1107d065fdf1 ("tpm_tis: Introduce intermediate layer for
> > > TPM access") Atmel 3203 TPM on ThinkPad X61S (TPM firmware version
> > > 13.9)
> > > no longer works.  The initialization proceeds fine until we get and
> > > start using chip-reported timeouts - and the chip reports C and D
> > > timeouts of zero.
> > > 
> > > It turns out that until commit 8e54caf407b98e ("tpm: Provide a generic
> > > means to override the chip returned timeouts") we had actually let
> > > default timeout values remain in this case, so let's bring back this
> > > behavior to make chips like Atmel 3203 work again.
> > > 
> > > Use a common code that was introduced by that commit so a warning is
> > > printed in this case and /sys/class/tpm/tpm*/timeouts correctly says
> > > the
> > > timeouts aren't chip-original.
> > > 
> > > Fixes: 1107d065fdf1 ("tpm_tis: Introduce intermediate layer for TPM
> > > access")
> > > Cc: stable@...r.kernel.org
> > > Signed-off-by: Maciej S. Szmigiero <mail@...iej.szmigiero.name>
> > > Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> > > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> > 
> > What is the git commit id for this patch in Linus's tree?
> 
> The git commit hash is 1d70fe9d9c3a4c627f9757cbba5d628687b121c1.
> 
> 
> Kind regards,
> 
> Paul

Do you want me to revise the backport? Thanks.

/Jarkko