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Date: Thu, 4 Apr 2024 09:21:50 +0200
From: Johan Hovold <johan@kernel.org>
To: Krishna Kurapati <quic_kriskura@quicinc.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Rob Herring <robh@kernel.org>,
	Bjorn Andersson <andersson@kernel.org>,
	Wesley Cheng <quic_wcheng@quicinc.com>,
	Konrad Dybcio <konrad.dybcio@linaro.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
	Felipe Balbi <balbi@kernel.org>, devicetree@vger.kernel.org,
	linux-arm-msm@vger.kernel.org, linux-usb@vger.kernel.org,
	linux-kernel@vger.kernel.org, quic_ppratap@quicinc.com,
	quic_jackp@quicinc.com, Johan Hovold <johan+linaro@kernel.org>
Subject: Re: [PATCH v19 2/9] usb: dwc3: core: Access XHCI address space
 temporarily to read port info
Message-ID: <Zg5VDnbaaBXJyRjV@hovoldconsulting.com>
References: <20240404051229.3082902-1-quic_kriskura@quicinc.com>
 <20240404051229.3082902-3-quic_kriskura@quicinc.com>
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In-Reply-To: <20240404051229.3082902-3-quic_kriskura@quicinc.com>

On Thu, Apr 04, 2024 at 10:42:22AM +0530, Krishna Kurapati wrote:
 
> +static int dwc3_get_num_ports(struct dwc3 *dwc)
> +{
> +	void __iomem *base;
> +	u8 major_revision;
> +	u32 offset;
> +	u32 val;
> +
> +	/*
> +	 * Remap xHCI address space to access XHCI ext cap regs since it is
> +	 * needed to get information on number of ports present.
> +	 */
> +	base = ioremap(dwc->xhci_resources[0].start,
> +		       resource_size(&dwc->xhci_resources[0]));
> +	if (!base)
> +		return PTR_ERR(base);

This is obviously still broken. You need to update the return value as
well.

Fix in v20.

Johan