linux-kernel - Re: [RFC PATCH 02/10] firmware: arm_scmi: Add missing xfer reinit

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Date:   Mon, 7 Jun 2021 18:42:57 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Cristian Marussi <cristian.marussi@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        james.quinlan@...adcom.com, Jonathan.Cameron@...wei.com,
        f.fainelli@...il.com, etienne.carriere@...aro.org,
        vincent.guittot@...aro.org, souvik.chakravarty@....com
Subject: Re: [RFC PATCH 02/10] firmware: arm_scmi: Add missing xfer
 reinit_completion

On Sun, Jun 06, 2021 at 11:12:24PM +0100, Cristian Marussi wrote:
> Reusing timed out xfers in a loop can lead to issue if completion was not
> properly reinitialized.
>
> Signed-off-by: Cristian Marussi <cristian.marussi@....com>
> ---
>  drivers/firmware/arm_scmi/driver.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
> index bee33f9c2032..759ae4a23e74 100644
> --- a/drivers/firmware/arm_scmi/driver.c
> +++ b/drivers/firmware/arm_scmi/driver.c
> @@ -448,6 +448,7 @@ static int do_xfer(const struct scmi_protocol_handle *ph,
>  			      xfer->hdr.poll_completion);
>
>  	xfer->hdr.status = SCMI_SUCCESS;
> +	reinit_completion(&xfer->done);
>

What could happen after xfer_get_init->scmi_xfer_get->reinit_completion
that it needs to be re-initialised again. I don't see any reason for this ?
If there are, please state them explicitly. If this is needed, I would drop
the one in scmi_xfer_get().

--
Regards,
Sudeep