linux-kernel - Re: [PATCH] tpm_tis: Add missing start/stop_tpm

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Message-ID: <YA774rPm1a39y/V7@kernel.org>
Date:   Mon, 25 Jan 2021 19:12:02 +0200
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Lukasz Majczak <lma@...ihalf.com>
Cc:     Peter Huewe <peterhuewe@....de>, Jason Gunthorpe <jgg@...pe.ca>,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        Radoslaw Biernacki <rad@...ihalf.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Alex Levin <levinale@...gle.com>
Subject: Re: [PATCH] tpm_tis: Add missing start/stop_tpm_chip calls

On Sat, Jan 23, 2021 at 02:42:47AM +0100, Lukasz Majczak wrote:
> There is a missing call to start_tpm_chip before the call to
> the tpm_get_timeouts() and tpm_tis_probe_irq_single(). As the current
> approach maight work for tpm2, it fails for tpm1.x - in that case
> call to tpm_get_timeouts() or tpm_tis_probe_irq_single() tries to
> transmit TPM commands on a disabled chip what what doesn't succeed
> and in turn causes tpm_tis_core_init() to fail.
> Tested on Samsung Chromebook Pro (Caroline).
> 
> Signed-off-by: Lukasz Majczak <lma@...ihalf.com>

Do you have a log demonstrating the failure?

/Jarkko