linux-kernel - Re: [PATCH] optee: don't fail on unsuccessful device enumeration

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Message-ID: <CAHUa44E968nR1toCGn0_k6ABw_By7Z8EqB2rGSgiTmseo8oL-Q@mail.gmail.com>
Date:   Wed, 13 May 2020 10:00:18 +0200
From:   Jens Wiklander <jens.wiklander@...aro.org>
To:     Volodymyr Babchuk <vlad.babchuk@...il.com>
Cc:     open list <linux-kernel@...r.kernel.org>,
        "tee-dev @ lists . linaro . org" <tee-dev@...ts.linaro.org>,
        Jerome Forissier <jerome@...issier.org>,
        Sumit Garg <sumit.garg@...aro.org>
Subject: Re: [PATCH] optee: don't fail on unsuccessful device enumeration

Hi Volodymyr,

On Wed, May 13, 2020 at 2:36 AM Volodymyr Babchuk
<vlad.babchuk@...il.com> wrote:
>
> optee_enumerate_devices() can fail for multiple of reasons. For
> example, I encountered issue when Xen OP-TEE mediator NACKed
> PTA_CMD_GET_DEVICES call. This should not result in driver
> initialization error because this is an optional feature.
>
> Thus, it is better to print warning, instead of termination driver
> initialization.
>
> Signed-off-by: Volodymyr Babchuk <vlad.babchuk@...il.com>
> ---

Looks good. Didn't apply directly at latest, but the conflict was easy
enough to resolve.

I'll pick up this in a day unless someone objects.

I'll add a
    Fixes: c3fa24af9244 ("tee: optee: add TEE bus device enumeration support")
Line.

Thanks,
Jens

>
> resend: fixed email in s-o-b tag. Sorry for the noise
>
> drivers/tee/optee/core.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
> index 34409c916882..a053930032f2 100644
> --- a/drivers/tee/optee/core.c
> +++ b/drivers/tee/optee/core.c
> @@ -728,10 +728,8 @@ static int __init optee_driver_init(void)
>                 return PTR_ERR(optee);
>
>         rc = optee_enumerate_devices();
> -       if (rc) {
> -               optee_remove(optee);
> -               return rc;
> -       }
> +       if (rc)
> +               pr_warn("can't enumerate optee devices: %d\n", rc);
>
>         pr_info("initialized driver\n");
>
> --
> 2.26.2
>