linux-kernel - Re: [PATCH net-next v3 3/8] net: qualcomm: ipqess: introduce the Qualcomm IPQESS driver

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Message-ID: <20231115181103.GX74656@kernel.org>
Date:   Wed, 15 Nov 2023 18:11:03 +0000
From:   Simon Horman <horms@...nel.org>
To:     Romain Gantois <romain.gantois@...tlin.com>
Cc:     davem@...emloft.net, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        thomas.petazzoni@...tlin.com, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org,
        Vladimir Oltean <vladimir.oltean@....com>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Robert Marko <robert.marko@...tura.hr>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>
Subject: Re: [PATCH net-next v3 3/8] net: qualcomm: ipqess: introduce the
 Qualcomm IPQESS driver

On Tue, Nov 14, 2023 at 11:55:53AM +0100, Romain Gantois wrote:
> The Qualcomm IPQ4019 Ethernet Switch Subsystem for the IPQ4019 chip
> includes an internal Ethernet switch based on the QCA8K IP.
> 
> The CPU-to-switch port data plane depends on the IPQESS EDMA Controller,
> a simple 1G Ethernet controller. It is connected to the switch through an
> internal link, and doesn't expose directly any external interface.
> 
> The EDMA controller has 16 RX and TX queues, with a very basic RSS fanout
> configured at init time.
> 
> Signed-off-by: Romain Gantois <romain.gantois@...tlin.com>

Hi Romain,

some minor feedback from my side.

> diff --git a/drivers/net/ethernet/qualcomm/ipqess/ipqess_switch.c b/drivers/net/ethernet/qualcomm/ipqess/ipqess_switch.c

...

> +static int ipqess_switch_probe(struct platform_device *pdev)
> +{

...

> +	for_each_available_child_of_node(ports, port_np) {
> +		ret = ipqess_port_register(sw, port_np);
> +		if (ret) {
> +			pr_err("Failed to register ipqess port! error %d\n", ret);

Coccinelle warns that a call to of_node_put() is needed here.

> +			goto out_ports;
> +		}
> +	}

...

> +static int
> +ipqess_switch_remove(struct platform_device *pdev)
> +{
> +	struct ipqess_switch *sw = platform_get_drvdata(pdev);
> +	struct qca8k_priv *priv = sw->priv;

Here sw is dereferenced...

> +	struct ipqess_port *port = NULL;
> +	int i;
> +
> +	if (!sw)
> +		return 0;

... but here the code guards against sw being NULL.
This seems inconsistent.

As flagged by Smatch.

...