[PATCH] tpm: Do not print an error message when doing TPM auto startup

[PATCH] tpm: Do not print an error message when doing TPM auto startup

[Jason Gunthorpe]

This is a regression when this code was reworked and made the error
print unconditional. The original code deliberately suppressed printing
of the first error message so it could quietly sense
TPM_ERR_INVALID_POSTINIT.

Fixes: a502feb67b47 ("tpm: Clean up reading of timeout and duration capabilities")
Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
---
 drivers/char/tpm/tpm-interface.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index a2688ac2b48f3c..c90f4f6d7871be 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -523,8 +523,7 @@ int tpm_get_timeouts(struct tpm_chip *chip)
 		return 0;
 	}
 
-	rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
-			"attempting to determine the timeouts");
+	rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL);
 	if (rc == TPM_ERR_INVALID_POSTINIT) {
 		/* The TPM is not started, we are the first to talk to it.
 		   Execute a startup command. */
@@ -535,8 +534,12 @@ int tpm_get_timeouts(struct tpm_chip *chip)
 		rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
 				"attempting to determine the timeouts");
 	}
-	if (rc)
+	if (rc) {
+		dev_err(&chip->dev,
+			"A TPM error (%zd) occurred attempting to determine the timeouts\n",
+			rc);
 		return rc;
+	}
 
 	old_timeout[0] = be32_to_cpu(cap.timeout.a);
 	old_timeout[1] = be32_to_cpu(cap.timeout.b);
-- 
2.1.4

Re: [PATCH] tpm: Do not print an error message when doing TPM auto startup

[Jarkko Sakkinen]

On Mon, Nov 21, 2016 at 11:31:09AM -0700, Jason Gunthorpe wrote:
> This is a regression when this code was reworked and made the error
> print unconditional. The original code deliberately suppressed printing
> of the first error message so it could quietly sense
> TPM_ERR_INVALID_POSTINIT.
> 
> Fixes: a502feb67b47 ("tpm: Clean up reading of timeout and duration capabilities")
> Signed-off-by: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>

Thanks for spotting this out. I'll apply this tomorrow (i.e. not
tonight) as it does not endager stability in anyway as I test the
other fixes.

Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>

/Jarkko

> ---
>  drivers/char/tpm/tpm-interface.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index a2688ac2b48f3c..c90f4f6d7871be 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -523,8 +523,7 @@ int tpm_get_timeouts(struct tpm_chip *chip)
>  		return 0;
>  	}
>  
> -	rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
> -			"attempting to determine the timeouts");
> +	rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL);
>  	if (rc == TPM_ERR_INVALID_POSTINIT) {
>  		/* The TPM is not started, we are the first to talk to it.
>  		   Execute a startup command. */
> @@ -535,8 +534,12 @@ int tpm_get_timeouts(struct tpm_chip *chip)
>  		rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
>  				"attempting to determine the timeouts");
>  	}
> -	if (rc)
> +	if (rc) {
> +		dev_err(&chip->dev,
> +			"A TPM error (%zd) occurred attempting to determine the timeouts\n",
> +			rc);
>  		return rc;
> +	}
>  
>  	old_timeout[0] = be32_to_cpu(cap.timeout.a);
>  	old_timeout[1] = be32_to_cpu(cap.timeout.b);
> -- 
> 2.1.4

------------------------------------------------------------------------------

Re: [PATCH] tpm: Do not print an error message when doing TPM auto startup

[Jason Gunthorpe]

On Mon, Nov 21, 2016 at 10:42:11PM +0200, Jarkko Sakkinen wrote:
> On Mon, Nov 21, 2016 at 11:31:09AM -0700, Jason Gunthorpe wrote:
> > This is a regression when this code was reworked and made the error
> > print unconditional. The original code deliberately suppressed printing
> > of the first error message so it could quietly sense
> > TPM_ERR_INVALID_POSTINIT.
> > 
> > Fixes: a502feb67b47 ("tpm: Clean up reading of timeout and duration capabilities")
> > Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
> 
> Thanks for spotting this out. I'll apply this tomorrow (i.e. not
> tonight) as it does not endager stability in anyway as I test the
> other fixes.
> 
> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

Hey Jarkko, I couldn't find this patch in your trees and it didn't
make 4.10-rc1, can you please pick it up?

https://patchwork.kernel.org/patch/9439931/

> /Jarkko
> 
> >  drivers/char/tpm/tpm-interface.c | 9 ++++++---
> >  1 file changed, 6 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> > index a2688ac2b48f3c..c90f4f6d7871be 100644
> > +++ b/drivers/char/tpm/tpm-interface.c
> > @@ -523,8 +523,7 @@ int tpm_get_timeouts(struct tpm_chip *chip)
> >  		return 0;
> >  	}
> >  
> > -	rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
> > -			"attempting to determine the timeouts");
> > +	rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL);
> >  	if (rc == TPM_ERR_INVALID_POSTINIT) {
> >  		/* The TPM is not started, we are the first to talk to it.
> >  		   Execute a startup command. */
> > @@ -535,8 +534,12 @@ int tpm_get_timeouts(struct tpm_chip *chip)
> >  		rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
> >  				"attempting to determine the timeouts");
> >  	}
> > -	if (rc)
> > +	if (rc) {
> > +		dev_err(&chip->dev,
> > +			"A TPM error (%zd) occurred attempting to determine the timeouts\n",
> > +			rc);
> >  		return rc;
> > +	}
> >  
> >  	old_timeout[0] = be32_to_cpu(cap.timeout.a);
> >  	old_timeout[1] = be32_to_cpu(cap.timeout.b);

-- 
Jason Gunthorpe <jgunthorpe@obsidianresearch.com>        (780)4406067x832
Chief Technology Officer, Obsidian Research Corp         Edmonton, Canada

Re: [PATCH] tpm: Do not print an error message when doing TPM auto startup

[Jarkko Sakkinen]

On Fri, Jan 06, 2017 at 02:25:51PM -0700, Jason Gunthorpe wrote:
> On Mon, Nov 21, 2016 at 10:42:11PM +0200, Jarkko Sakkinen wrote:
> > On Mon, Nov 21, 2016 at 11:31:09AM -0700, Jason Gunthorpe wrote:
> > > This is a regression when this code was reworked and made the error
> > > print unconditional. The original code deliberately suppressed printing
> > > of the first error message so it could quietly sense
> > > TPM_ERR_INVALID_POSTINIT.
> > > 
> > > Fixes: a502feb67b47 ("tpm: Clean up reading of timeout and duration capabilities")
> > > Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
> > 
> > Thanks for spotting this out. I'll apply this tomorrow (i.e. not
> > tonight) as it does not endager stability in anyway as I test the
> > other fixes.
> > 
> > Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> 
> Hey Jarkko, I couldn't find this patch in your trees and it didn't
> make 4.10-rc1, can you please pick it up?
> 
> https://patchwork.kernel.org/patch/9439931/

My bad. It's applied now. Can you check that everything looks good
and I'll ask James to take the fixes that I have to 4.10?

/Jarkko

> 
> > /Jarkko
> > 
> > >  drivers/char/tpm/tpm-interface.c | 9 ++++++---
> > >  1 file changed, 6 insertions(+), 3 deletions(-)
> > > 
> > > diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> > > index a2688ac2b48f3c..c90f4f6d7871be 100644
> > > +++ b/drivers/char/tpm/tpm-interface.c
> > > @@ -523,8 +523,7 @@ int tpm_get_timeouts(struct tpm_chip *chip)
> > >  		return 0;
> > >  	}
> > >  
> > > -	rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
> > > -			"attempting to determine the timeouts");
> > > +	rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL);
> > >  	if (rc == TPM_ERR_INVALID_POSTINIT) {
> > >  		/* The TPM is not started, we are the first to talk to it.
> > >  		   Execute a startup command. */
> > > @@ -535,8 +534,12 @@ int tpm_get_timeouts(struct tpm_chip *chip)
> > >  		rc = tpm_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
> > >  				"attempting to determine the timeouts");
> > >  	}
> > > -	if (rc)
> > > +	if (rc) {
> > > +		dev_err(&chip->dev,
> > > +			"A TPM error (%zd) occurred attempting to determine the timeouts\n",
> > > +			rc);
> > >  		return rc;
> > > +	}
> > >  
> > >  	old_timeout[0] = be32_to_cpu(cap.timeout.a);
> > >  	old_timeout[1] = be32_to_cpu(cap.timeout.b);
> 
> -- 
> Jason Gunthorpe <jgunthorpe@obsidianresearch.com>        (780)4406067x832
> Chief Technology Officer, Obsidian Research Corp         Edmonton, Canada