linux-kernel - Re: [PATCH 1/2 v2] tpm: cmd_ready command can be issued only after granting locality

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Message-ID: <20180206200255.ib7hblberqj6anh5@linux.intel.com>
Date:   Tue, 6 Feb 2018 22:02:55 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     "Winkler, Tomas" <tomas.winkler@...el.com>
Cc:     Jason Gunthorpe <jgg@...pe.ca>,
        "Usyskin, Alexander" <alexander.usyskin@...el.com>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2 v2] tpm: cmd_ready command can be issued only after
 granting locality

On Sun, Jan 28, 2018 at 09:17:53PM +0000, Winkler, Tomas wrote:
> 
> > 
> > On Sun, Jan 28, 2018 at 09:51:00AM +0200, Tomas Winkler wrote:
> > 
> > > diff --git a/include/linux/tpm.h b/include/linux/tpm.h index
> > > bcdd3790e94d..06639fb6ab85 100644
> > > +++ b/include/linux/tpm.h
> > > @@ -44,7 +44,7 @@ struct tpm_class_ops {
> > >  	bool (*update_timeouts)(struct tpm_chip *chip,
> > >  				unsigned long *timeout_cap);
> > >  	int (*request_locality)(struct tpm_chip *chip, int loc);
> > > -	void (*relinquish_locality)(struct tpm_chip *chip, int loc);
> > > +	int (*relinquish_locality)(struct tpm_chip *chip, int loc);
> > 
> > This seems wrong.. What is the core code supposed to do if relinquish fails?
> 
> Not much just propage the error to the caller and leave the policy
> decision to it.

Your patch set must either cover this or keep it as void.

A better idea is to print an error to klog.

/Jarkko