linux-kernel - RE: [PATCH v6 03/20] tpm: factor out tpm 1.x duration calculation to tpm1-cmd.c

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Date:   Wed, 17 Oct 2018 12:24:28 +0000
From:   "Winkler, Tomas" <tomas.winkler@...el.com>
To:     Nayna Jain <nayna@...ux.ibm.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Jason Gunthorpe <jgg@...pe.ca>
CC:     Nayna Jain <nayna@...ux.vnet.ibm.com>,
        "Usyskin, Alexander" <alexander.usyskin@...el.com>,
        "Struk, Tadeusz" <tadeusz.struk@...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 v6 03/20] tpm: factor out tpm 1.x duration calculation
 to tpm1-cmd.c

> 
> 
> 
> On 10/17/2018 12:15 PM, Tomas Winkler wrote:
> > diff --git a/drivers/char/tpm/tpm_i2c_nuvoton.c
> > b/drivers/char/tpm/tpm_i2c_nuvoton.c
> > index caa86b19c76d..5d20e98b844f 100644
> > --- a/drivers/char/tpm/tpm_i2c_nuvoton.c
> > +++ b/drivers/char/tpm/tpm_i2c_nuvoton.c
> > @@ -370,6 +370,7 @@ static int i2c_nuvoton_send(struct tpm_chip *chip,
> u8 *buf, size_t len)
> >   	struct i2c_client *client = to_i2c_client(dev);
> >   	u32 ordinal;
> >   	size_t count = 0;
> > +	unsigned long duration;
> >   	int burst_count, bytes2write, retries, rc = -EIO;
> >
> >   	for (retries = 0; retries < TPM_RETRY; retries++) { @@ -455,12
> > +456,11 @@ static int i2c_nuvoton_send(struct tpm_chip *chip, u8 *buf,
> size_t len)
> >   		return rc;
> >   	}
> >   	ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
> > -	rc = i2c_nuvoton_wait_for_data_avail(chip,
> > -					     tpm_calc_ordinal_duration(chip,
> > -								       ordinal),
> > -					     &priv->read_queue);
> > +	duration = tpm1_calc_ordinal_duration(chip, ordinal);
> 
> 
> This version of the patch didn't address my previous comment - "The original
> code in the nuvoton driver does not differentiate between TPM 1.2 and TPM
> 2.0 as it does in tpm_tis_core.c.
> Before making any changes, I would first fix it, so that it could easily be
> backported. Only then do the refactoring."

This patch doesn't change the original behavior, just change the name of the function,  so there is no regression.
I would suggest there is another bug in those drivers/devices that is orthogonal to this refactoring and should not block this from merging.
According to what you say  it can call just tpm_calc_oridnal_duration() instead of tpm1_calc_ordinal_duration(chip, ordinal),
but I prefer that someone that has those devices will do that change on top of this series as  I cannot test it.

Thanks
Tomas