linux-kernel - [PATCH 3/3] USB: dwc3: qcom: fix ACPI platform device leak

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Date:   Fri, 17 Nov 2023 18:36:50 +0100
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>,
        Shawn Guo <shawn.guo@...aro.org>
Subject: [PATCH 3/3] USB: dwc3: qcom: fix ACPI platform device leak

Make sure to free the "urs" platform device, which is created for some
ACPI platforms, on probe errors and on driver unbind.

Compile-tested only.

Fixes: c25c210f590e ("usb: dwc3: qcom: add URS Host support for sdm845 ACPI boot")
Cc: Shawn Guo <shawn.guo@...aro.org>
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/usb/dwc3/dwc3-qcom.c | 37 +++++++++++++++++++++++++++++-------
 1 file changed, 30 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 0703f9b85cda..10fb481d943b 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -767,9 +767,9 @@ static int dwc3_qcom_of_register_core(struct platform_device *pdev)
 	return ret;
 }
 
-static struct platform_device *
-dwc3_qcom_create_urs_usb_platdev(struct device *dev)
+static struct platform_device *dwc3_qcom_create_urs_usb_platdev(struct device *dev)
 {
+	struct platform_device *urs_usb = NULL;
 	struct fwnode_handle *fwh;
 	struct acpi_device *adev;
 	char name[8];
@@ -789,9 +789,26 @@ dwc3_qcom_create_urs_usb_platdev(struct device *dev)
 
 	adev = to_acpi_device_node(fwh);
 	if (!adev)
-		return NULL;
+		goto err_put_handle;
+
+	urs_usb = acpi_create_platform_device(adev, NULL);
+	if (IS_ERR_OR_NULL(urs_usb))
+		goto err_put_handle;
+
+	return urs_usb;
 
-	return acpi_create_platform_device(adev, NULL);
+err_put_handle:
+	fwnode_handle_put(fwh);
+
+	return urs_usb;
+}
+
+static void dwc3_qcom_destroy_urs_usb_platdev(struct platform_device *urs_usb)
+{
+	struct fwnode_handle *fwh = urs_usb->dev.fwnode;
+
+	platform_device_unregister(urs_usb);
+	fwnode_handle_put(fwh);
 }
 
 static int dwc3_qcom_probe(struct platform_device *pdev)
@@ -875,13 +892,13 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
 	qcom->qscratch_base = devm_ioremap_resource(dev, parent_res);
 	if (IS_ERR(qcom->qscratch_base)) {
 		ret = PTR_ERR(qcom->qscratch_base);
-		goto clk_disable;
+		goto free_urs;
 	}
 
 	ret = dwc3_qcom_setup_irq(pdev);
 	if (ret) {
 		dev_err(dev, "failed to setup IRQs, err=%d\n", ret);
-		goto clk_disable;
+		goto free_urs;
 	}
 
 	/*
@@ -900,7 +917,7 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
 
 	if (ret) {
 		dev_err(dev, "failed to register DWC3 Core, err=%d\n", ret);
-		goto clk_disable;
+		goto free_urs;
 	}
 
 	ret = dwc3_qcom_interconnect_init(qcom);
@@ -939,6 +956,9 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
 		platform_device_del(qcom->dwc3);
 	}
 	platform_device_put(qcom->dwc3);
+free_urs:
+	if (qcom->urs_usb)
+		dwc3_qcom_destroy_urs_usb_platdev(qcom->urs_usb);
 clk_disable:
 	for (i = qcom->num_clocks - 1; i >= 0; i--) {
 		clk_disable_unprepare(qcom->clks[i]);
@@ -965,6 +985,9 @@ static void dwc3_qcom_remove(struct platform_device *pdev)
 	}
 	platform_device_put(qcom->dwc3);
 
+	if (qcom->urs_usb)
+		dwc3_qcom_destroy_urs_usb_platdev(qcom->urs_usb);
+
 	for (i = qcom->num_clocks - 1; i >= 0; i--) {
 		clk_disable_unprepare(qcom->clks[i]);
 		clk_put(qcom->clks[i]);
-- 
2.41.0