linux-kernel - Re: [PATCH v16 7/9] usb: dwc3: qcom: Refactor IRQ handling in glue driver

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Date: Mon, 25 Mar 2024 14:23:26 +0100
From: Johan Hovold <johan@...nel.org>
To: Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Wesley Cheng <quic_wcheng@...cinc.com>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
	Felipe Balbi <balbi@...nel.org>, devicetree@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, quic_ppratap@...cinc.com,
	quic_jackp@...cinc.com
Subject: Re: [PATCH v16 7/9] usb: dwc3: qcom: Refactor IRQ handling in glue
 driver

On Mon, Mar 25, 2024 at 06:45:07PM +0530, Krishna Kurapati PSSNV wrote:
> >> +static int dwc3_qcom_setup_irq(struct platform_device *pdev)
> >> +{
> >> +	struct dwc3_qcom *qcom = platform_get_drvdata(pdev);
> >> +	bool is_multiport;
> >> +	int ret;
> >> +	int i;
> >> +
> >> +	qcom->num_ports = dwc3_qcom_find_num_ports(pdev);
> >> +	if (qcom->num_ports < 0)
> >> +		return -ENOMEM;
> > 
> > Just return 'ret' directly.
> 
> Sure, will init ret to -ENOMEM and return ret here.

I meant that you should return whatever error dwc3_qcom_find_num_ports()
returns, so perhaps something like:

	
	ret = dwc3_qcom_find_num_ports(pdev);
	if (ret < 0)
		return ret;

	qcom->num_ports = ret;

It looks like dwc3_qcom_find_num_ports() can also return 0 (e.g. on
malformed DT), which also needs to be handled somehow. I missed that
earlier.

Johan