linux-kernel - Re: [PATCH v2 2/3] net: stmmac: Add interconnect support

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Date: Fri, 28 Jun 2024 14:58:24 -0700
From: Sagar Cheluvegowda <quic_scheluve@...cinc.com>
To: Andrew Lunn <andrew@...n.ch>
CC: Vinod Koul <vkoul@...nel.org>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S.
 Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        "Jakub
 Kicinski" <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin
	<mcoquelin.stm32@...il.com>,
        Russell King <linux@...linux.org.uk>, "Rob
 Herring" <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        "Conor
 Dooley" <conor+dt@...nel.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>, <kernel@...cinc.com>,
        Andrew Halaney <ahalaney@...hat.com>, <linux-arm-msm@...r.kernel.org>,
        <netdev@...r.kernel.org>, <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] net: stmmac: Add interconnect support



On 6/26/2024 5:12 PM, Andrew Lunn wrote:
> On Wed, Jun 26, 2024 at 04:36:06PM -0700, Sagar Cheluvegowda wrote:
>>
>>
>> On 6/26/2024 6:07 AM, Andrew Lunn wrote:
>>>> +	plat->axi_icc_path = devm_of_icc_get(&pdev->dev, "axi");
>>>> +	if (IS_ERR(plat->axi_icc_path)) {
>>>> +		ret = (void *)plat->axi_icc_path;
>>>
>>> Casting	to a void * seems odd. ERR_PTR()?
>>>
>>> 	Andrew
>>
>> The output of devm_of_icc_get is a pointer of type icc_path,
>> i am getting below warning when i try to ERR_PTR instead of Void*
>> as ERR_PTR will try to convert a long integer to a Void*.
>>
>> "warning: passing argument 1 of ‘ERR_PTR’ makes integer from pointer without a cast"
>>
> 
> https://elixir.bootlin.com/linux/v6.10-rc5/source/drivers/crypto/qce/core.c#L224
> https://elixir.bootlin.com/linux/v6.10-rc5/source/drivers/gpu/drm/msm/adreno/a3xx_gpu.c#L591
> https://elixir.bootlin.com/linux/v6.10-rc5/source/drivers/gpu/drm/msm/adreno/a3xx_gpu.c#L597
> https://elixir.bootlin.com/linux/v6.10-rc5/source/drivers/spi/spi-qup.c#L1052
> 
> Sorry, PTR_ERR().
> 
> In general, a cast to a void * is a red flag and will get looked
> at. It is generally wrong. So you might want to fixup where ever you
> copied this from.
> 
> 	Andrew
the return type of stmmac_probe_config_dt is a pointer of type plat_stmmacenet_data,
as PTR_ERR would give long integer value i don't think it would be ideal to
return an integer value here, if casting plat->axi_icc_path to a void * doesn't look
good, let me if the below solution is better or not?


 	plat->axi_icc_path = devm_of_icc_get(&pdev->dev, "axi");
	if (IS_ERR(plat->axi_icc_path)) {
		rc = PTR_ERR(plat->axi_icc_path);
		ret = ERR_PTR(rc);
		goto error_hw_init;
	}

	plat->ahb_icc_path = devm_of_icc_get(&pdev->dev, "ahb");
	if (IS_ERR(plat->ahb_icc_path)) {
		rc = PTR_ERR(plat->ahb_icc_path);
		ret = ERR_PTR(rc);
		goto error_hw_init;
	}

	plat->stmmac_rst = devm_reset_control_get_optional(&pdev->dev,
							   STMMAC_RESOURCE_NAME);
	if (IS_ERR(plat->stmmac_rst)) {
		ret = plat->stmmac_rst;
		goto error_hw_init;
	}

	plat->stmmac_ahb_rst = devm_reset_control_get_optional_shared(
							&pdev->dev, "ahb");
	if (IS_ERR(plat->stmmac_ahb_rst)) {
		ret = plat->stmmac_ahb_rst;
		goto error_hw_init;
	}

	return plat;

error_hw_init:
	clk_disable_unprepare(plat->pclk);
error_pclk_get:
	clk_disable_unprepare(plat->stmmac_clk);

	return ret;
}

Regards,
Sagar