linux-kernel - Re: [PATCH] tee: optee: Fix missing devices unregister during optee

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Message-ID: <CAFA6WYNqzmEe23RQ2Wrq2oeaxAxxwg+e3sW0=7PmgZni5Sd2eQ@mail.gmail.com>
Date:   Wed, 13 Oct 2021 11:30:04 +0530
From:   Sumit Garg <sumit.garg@...aro.org>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     OP-TEE TrustedFirmware <op-tee@...ts.trustedfirmware.org>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        Jerome Forissier <jerome@...issier.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Maxim Uvarov <maxim.uvarov@...aro.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tee: optee: Fix missing devices unregister during optee_remove

On Tue, 12 Oct 2021 at 23:33, Sudeep Holla <sudeep.holla@....com> wrote:
>
> On Tue, Oct 12, 2021 at 01:01:16PM +0530, Sumit Garg wrote:
> > When OP-TEE driver is built as a module, OP-TEE client devices
> > registered on TEE bus during probe should be unregistered during
> > optee_remove. So implement optee_unregister_devices() accordingly.
> >
> > Fixes: c3fa24af9244 ("tee: optee: add TEE bus device enumeration support")
> > Reported-by: Sudeep Holla <sudeep.holla@....com>
> > Signed-off-by: Sumit Garg <sumit.garg@...aro.org>
> > ---
> >  drivers/tee/optee/core.c          |  3 +++
> >  drivers/tee/optee/device.c        | 22 ++++++++++++++++++++++
> >  drivers/tee/optee/optee_private.h |  1 +
> >  3 files changed, 26 insertions(+)
> >
> > diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
> > index ccad3c7c8f6d..3915dc574503 100644
> > --- a/drivers/tee/optee/core.c
> > +++ b/drivers/tee/optee/core.c
> > @@ -586,6 +586,9 @@ static int optee_remove(struct platform_device *pdev)
> >  {
> >       struct optee *optee = platform_get_drvdata(pdev);
> >
> > +     /* Unregister OP-TEE specific client devices on TEE bus */
> > +     optee_unregister_devices();
> > +
>
> This is not based on FF-A support series by Jens I assume.

Yeah as it fixes an existing problem and for stable backport reasons I
would suggest rebasing FF-A support series on top of it.

> I added
> optee_unregister_devices to optee_remove_common and that fixes the issue
> I reported. I haven't followed the comments by Jens on the approach yet.
>

Thanks for testing this fix.

-Sumit

> --
> Regards,
> Sudeep