linux-kernel - Re: [PATCH v16 2/6] tpm: tpm_tis: Rewrite "tpm_tis_req

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Date:   Sat, 23 Oct 2021 03:46:18 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     amirmizi6@...il.com, 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,
        benoit.houyere@...com, eajames@...ux.ibm.com, joel@....id.au
Cc:     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 v16 2/6] tpm: tpm_tis: Rewrite "tpm_tis_req_canceled()"

On Thu, 2021-10-21 at 15:05 +0300, amirmizi6@...il.com wrote:
> From: Amir Mizinski <amirmizi6@...il.com>
> 
> tpm_tis_req_canceled() function is used to check if the caller requested
> to abort the current operation. It was found that in some cases
> tpm_tis_req_canceled() wrongly returned true.
> Since a cancel request sets the TPM_STS.commandReady field to TRUE, the
> tpm_tis_req_canceled() function should check only the TPM_STS.commandReady
> field value.
> The case for TPM_VID_WINBOND is wrong and was therefore removed.
> 
> Also, the default comparison is wrong. Only cmdReady bit needs to be
> compared instead of the full lower status register byte.
> 
> Fixes: 1f866057291f (tpm: Fix cancellation of TPM commands (polling mode))

Please go through the comments for 1/6 and fix the commit
for the rest of the patches.

/Jarkko