linux-kernel - Re: [PATCH v4 3/7] tpm: tpm_tis: rewrite "tpm_tis_req

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Message-ID: <20200331121352.GA9284@linux.intel.com>
Date:   Tue, 31 Mar 2020 15:13:52 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     amirmizi6@...il.com
Cc:     Eyal.Cohen@...oton.com, oshrialkoby85@...il.com,
        alexander.steffen@...ineon.com, robh+dt@...nel.org,
        mark.rutland@....com, peterhuewe@....de, jgg@...pe.ca,
        arnd@...db.de, gregkh@...uxfoundation.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-integrity@...r.kernel.org, oshri.alkoby@...oton.com,
        tmaimon77@...il.com, gcwilson@...ibm.com, kgoldman@...ibm.com,
        Dan.Morav@...oton.com, oren.tanami@...oton.com,
        shmulik.hager@...oton.com, amir.mizinski@...oton.com
Subject: Re: [PATCH v4 3/7] tpm: tpm_tis: rewrite "tpm_tis_req_canceled()"

On Tue, Mar 31, 2020 at 02:32:03PM +0300, amirmizi6@...il.com wrote:
> From: Amir Mizinski <amirmizi6@...il.com>
> 
> Using this function while read/write data resulted in aborted operation.
> After investigating according to TCG TPM Profile (PTP) Specifications,
> i found cancel should happen only if TPM_STS.commandReady bit is lit and
> couldn't find a case when the current condition is valid.
> Also only cmdReady bit need to be compared instead of the full lower status
> register byte.
> 
> Signed-off-by: Amir Mizinski <amirmizi6@...il.com>

We don't care about spec's. We care about hardware and not all hardware
follows specifications.

Please fix the exact thing you want to fix (and please provide a fixes
tag).

/Jarkko