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

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Date:   Fri, 14 Jun 2019 11:12:36 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Jason Gunthorpe <jgg@...pe.ca>
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

Quoting Jason Gunthorpe (2019-06-13 16:26:13)
> 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.
> 

To make sure the bit is tested under a lock so that suspend/resume can't
update the bit in parallel?