linux-kernel - Re: [PATCH 1/8] tpm: block messages while suspended

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Message-ID: <20190613232613.GH22901@ziepe.ca>
Date:   Thu, 13 Jun 2019 20:26:13 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Peter Huewe <peterhuewe@....de>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Andrey Pronin <apronin@...omium.org>,
        linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-integrity@...r.kernel.org, devicetree@...r.kernel.org,
        Duncan Laurie <dlaurie@...omium.org>,
        Guenter Roeck <groeck@...omium.org>
Subject: Re: [PATCH 1/8] tpm: block messages while suspended

On Thu, Jun 13, 2019 at 11:09:24AM -0700, Stephen Boyd wrote:
> From: Andrey Pronin <apronin@...omium.org>
> 
> Other drivers or userspace may initiate sending a message to the tpm
> while the device itself and the controller of the bus it is on are
> suspended. That may break the bus driver logic.
> Block sending messages while the device is suspended.
> 
> Signed-off-by: Andrey Pronin <apronin@...omium.org>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> 
> I don't think this was ever posted before.

Use a real lock.

Jason