Re: [PATCH 02/22] firmware: arm_scmi: Make protocols init fail on basic errors

[Sudeep Holla <sudeep.holla@arm.com>]

On Wed, Mar 30, 2022 at 04:05:31PM +0100, Cristian Marussi wrote:
> Bail out of protocol initialization routine early when basic information
> about protocol version and attributes could not be retrieved: failing to
> act this way can lead to a successfully initialized SCMI protocol which
> is in fact not fully functional.
>
> Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
> ---
>  drivers/firmware/arm_scmi/base.c    |  5 ++++-
>  drivers/firmware/arm_scmi/clock.c   |  8 ++++++--
>  drivers/firmware/arm_scmi/perf.c    | 10 +++++++---
>  drivers/firmware/arm_scmi/power.c   | 10 +++++++---
>  drivers/firmware/arm_scmi/reset.c   | 10 +++++++---
>  drivers/firmware/arm_scmi/sensors.c |  4 +++-
>  drivers/firmware/arm_scmi/system.c  |  5 ++++-
>  7 files changed, 38 insertions(+), 14 deletions(-)
>
> @@ -370,7 +372,9 @@ static int scmi_clock_protocol_init(const struct scmi_protocol_handle *ph)
>  	if (!cinfo)
>  		return -ENOMEM;
>
> -	scmi_clock_protocol_attributes_get(ph, cinfo);
> +	ret = scmi_clock_protocol_attributes_get(ph, cinfo);
> +	if (ret)
> +		return ret;

Does this result in removal of scmi_dev associated with devm_* calls ?
Otherwise we may need to free the allocated buffers ? I am not sure
if the dev here is individual scmi_dev or the platform scmi device.
I assume latter and it is unlikely to be removed/freed with the error in
the above path.

Similarly in couple of other instances/protocols.

--
Regards,
Sudeep