linux-kernel - Re: [PATCH v2 3/3] usb: typec: tcpm: Get Sink VDO from fwnode

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Date:   Sun, 31 Jan 2021 08:02:41 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Kyle Tso <kyletso@...gle.com>, heikki.krogerus@...ux.intel.com,
        gregkh@...uxfoundation.org, hdegoede@...hat.com, robh+dt@...nel.org
Cc:     badhri@...gle.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 3/3] usb: typec: tcpm: Get Sink VDO from fwnode

On 1/31/21 7:18 AM, Kyle Tso wrote:
> Commit a079973f462a ("usb: typec: tcpm: Remove tcpc_config
> configuration mechanism") removed the tcpc_config which includes the
> Sink VDO and it is not yet added back with fwnode. Add it now.
> 
> Signed-off-by: Kyle Tso <kyletso@...gle.com>
> ---
> Changes since v1:
> - updated the commit message
> 
>  drivers/usb/typec/tcpm/tcpm.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 403a483645dd..84c8a52f8af1 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -5677,6 +5677,18 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
>  			port->new_source_frs_current = frs_current;
>  	}
>  
> +	ret = fwnode_property_read_u32_array(fwnode, "sink-vdos", NULL, 0);

fwnode_property_count_u32(), maybe ?

> +	if (ret <= 0 && ret != -EINVAL) {
> +		return -EINVAL;

Why return any error except -EINVAL (including return values of 0) as -EINVAL,
and -EINVAL as no error ?

> +	} else if (ret > 0) {
> +		port->nr_snk_vdo = min(ret, VDO_MAX_OBJECTS);
> +		ret = fwnode_property_read_u32_array(fwnode, "sink-vdos",
> +						     port->snk_vdo,
> +						     port->nr_snk_vdo);
> +		if (ret < 0)
> +			return -EINVAL;

static analyzer code used to complain about overriding error codes.
Not sure if that is still true. Either case, why not return the
original error ?

Thanks,
Guenter

> +	}
> +
>  	return 0;
>  }
>  
>