netdev - Re: [PATCH v2 net 5/8] net: mscc: ocelot: error checking when calling ocelot

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Date:   Fri, 18 Sep 2020 17:28:26 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, yangbo.lu@....com,
        xiaoliang.yang_1@....com, UNGLinuxDriver@...rochip.com,
        claudiu.manoil@....com, andrew@...n.ch, vivien.didelot@...il.com,
        f.fainelli@...il.com, kuba@...nel.org
Subject: Re: [PATCH v2 net 5/8] net: mscc: ocelot: error checking when
 calling ocelot_init()

On 18/09/2020 04:07:27+0300, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@....com>
> 
> ocelot_init() allocates memory, resets the switch and polls for a status
> register, things which can fail. Stop probing the driver in that case,
> and propagate the error result.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> Reviewed-by: Horatiu Vultur <horatiu.vultur@...rochip.com>

Tested-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
Reviewed-by: Alexandre Belloni <alexandre.belloni@...tlin.com>

> ---
> Changes in v2:
> Stopped leaking the 'ports' OF node in the VSC7514 driver.
> 
>  drivers/net/dsa/ocelot/felix.c             | 5 ++++-
>  drivers/net/ethernet/mscc/ocelot_vsc7514.c | 5 ++++-
>  2 files changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
> index a1e1d3824110..f7b43f8d56ed 100644
> --- a/drivers/net/dsa/ocelot/felix.c
> +++ b/drivers/net/dsa/ocelot/felix.c
> @@ -571,7 +571,10 @@ static int felix_setup(struct dsa_switch *ds)
>  	if (err)
>  		return err;
>  
> -	ocelot_init(ocelot);
> +	err = ocelot_init(ocelot);
> +	if (err)
> +		return err;
> +
>  	if (ocelot->ptp) {
>  		err = ocelot_init_timestamp(ocelot, &ocelot_ptp_clock_info);
>  		if (err) {
> diff --git a/drivers/net/ethernet/mscc/ocelot_vsc7514.c b/drivers/net/ethernet/mscc/ocelot_vsc7514.c
> index 904ea299a5e8..a1cbb20a7757 100644
> --- a/drivers/net/ethernet/mscc/ocelot_vsc7514.c
> +++ b/drivers/net/ethernet/mscc/ocelot_vsc7514.c
> @@ -1002,7 +1002,10 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
>  	ocelot->vcap_is2_actions = vsc7514_vcap_is2_actions;
>  	ocelot->vcap = vsc7514_vcap_props;
>  
> -	ocelot_init(ocelot);
> +	err = ocelot_init(ocelot);
> +	if (err)
> +		goto out_put_ports;
> +
>  	if (ocelot->ptp) {
>  		err = ocelot_init_timestamp(ocelot, &ocelot_ptp_clock_info);
>  		if (err) {
> -- 
> 2.25.1
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com