PCI: dwc: Convert to platform remove callback returning void

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is (mostly) ignored
and this typically results in resource leaks. To improve here there is a
quest to make the remove callback return void. In the first step of this
quest all drivers are converted to .remove_new() which already returns
void.

Trivially convert the dwc drivers from always returning zero in the remove
callback to the void returning variant.

[kwilczynski: commit log]
Link: https://lore.kernel.org/linux-pci/20230321193208.366561-7-u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Acked-by: Serge Semin <fancer.lancer@gmail.com>

drivers/pci/controller/dwc/pcie-bt1.c

@@ -617,13 +617,11 @@ static int bt1_pcie_probe(struct platform_device *pdev)
 	return bt1_pcie_add_port(btpci);
 }
 
-static int bt1_pcie_remove(struct platform_device *pdev)
+static void bt1_pcie_remove(struct platform_device *pdev)
 {
 	struct bt1_pcie *btpci = platform_get_drvdata(pdev);
 
 	bt1_pcie_del_port(btpci);
-
-	return 0;
 }
 
 static const struct of_device_id bt1_pcie_of_match[] = {
@@ -634,7 +632,7 @@ MODULE_DEVICE_TABLE(of, bt1_pcie_of_match);
 
 static struct platform_driver bt1_pcie_driver = {
 	.probe = bt1_pcie_probe,
-	.remove = bt1_pcie_remove,
+	.remove_new = bt1_pcie_remove,
 	.driver = {
 		.name	= "bt1-pcie",
 		.of_match_table = bt1_pcie_of_match,

drivers/pci/controller/dwc/pcie-histb.c

@@ -421,16 +421,14 @@ static int histb_pcie_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int histb_pcie_remove(struct platform_device *pdev)
+static void histb_pcie_remove(struct platform_device *pdev)
 {
 	struct histb_pcie *hipcie = platform_get_drvdata(pdev);
 
 	histb_pcie_host_disable(hipcie);
 
 	if (hipcie->phy)
 		phy_exit(hipcie->phy);
-
-	return 0;
 }
 
 static const struct of_device_id histb_pcie_of_match[] = {
@@ -441,7 +439,7 @@ MODULE_DEVICE_TABLE(of, histb_pcie_of_match);
 
 static struct platform_driver histb_pcie_platform_driver = {
 	.probe	= histb_pcie_probe,
-	.remove	= histb_pcie_remove,
+	.remove_new = histb_pcie_remove,
 	.driver = {
 		.name = "histb-pcie",
 		.of_match_table = histb_pcie_of_match,

drivers/pci/controller/dwc/pcie-intel-gw.c

@@ -340,15 +340,13 @@ static void __intel_pcie_remove(struct intel_pcie *pcie)
 	phy_exit(pcie->phy);
 }
 
-static int intel_pcie_remove(struct platform_device *pdev)
+static void intel_pcie_remove(struct platform_device *pdev)
 {
 	struct intel_pcie *pcie = platform_get_drvdata(pdev);
 	struct dw_pcie_rp *pp = &pcie->pci.pp;
 
 	dw_pcie_host_deinit(pp);
 	__intel_pcie_remove(pcie);
-
-	return 0;
 }
 
 static int intel_pcie_suspend_noirq(struct device *dev)
@@ -443,7 +441,7 @@ static const struct of_device_id of_intel_pcie_match[] = {
 
 static struct platform_driver intel_pcie_driver = {
 	.probe = intel_pcie_probe,
-	.remove = intel_pcie_remove,
+	.remove_new = intel_pcie_remove,
 	.driver = {
 		.name = "intel-gw-pcie",
 		.of_match_table = of_intel_pcie_match,

drivers/pci/controller/dwc/pcie-qcom-ep.c

@@ -784,7 +784,7 @@ static int qcom_pcie_ep_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int qcom_pcie_ep_remove(struct platform_device *pdev)
+static void qcom_pcie_ep_remove(struct platform_device *pdev)
 {
 	struct qcom_pcie_ep *pcie_ep = platform_get_drvdata(pdev);
 
@@ -794,11 +794,9 @@ static int qcom_pcie_ep_remove(struct platform_device *pdev)
 	debugfs_remove_recursive(pcie_ep->debugfs);
 
 	if (pcie_ep->link_status == QCOM_PCIE_EP_LINK_DISABLED)
-		return 0;
+		return;
 
 	qcom_pcie_disable_resources(pcie_ep);
-
-	return 0;
 }
 
 static const struct of_device_id qcom_pcie_ep_match[] = {
@@ -810,7 +808,7 @@ MODULE_DEVICE_TABLE(of, qcom_pcie_ep_match);
 
 static struct platform_driver qcom_pcie_ep_driver = {
 	.probe	= qcom_pcie_ep_probe,
-	.remove = qcom_pcie_ep_remove,
+	.remove_new = qcom_pcie_ep_remove,
 	.driver	= {
 		.name = "qcom-pcie-ep",
 		.of_match_table	= qcom_pcie_ep_match,

drivers/pci/controller/dwc/pcie-tegra194.c

@@ -2268,13 +2268,13 @@ static int tegra_pcie_dw_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int tegra_pcie_dw_remove(struct platform_device *pdev)
+static void tegra_pcie_dw_remove(struct platform_device *pdev)
 {
 	struct tegra_pcie_dw *pcie = platform_get_drvdata(pdev);
 
 	if (pcie->of_data->mode == DW_PCIE_RC_TYPE) {
 		if (!pcie->link_state)
-			return 0;
+			return;
 
 		debugfs_remove_recursive(pcie->debugfs);
 		tegra_pcie_deinit_controller(pcie);
@@ -2288,8 +2288,6 @@ static int tegra_pcie_dw_remove(struct platform_device *pdev)
 	tegra_bpmp_put(pcie->bpmp);
 	if (pcie->pex_refclk_sel_gpiod)
 		gpiod_set_value(pcie->pex_refclk_sel_gpiod, 0);
-
-	return 0;
 }
 
 static int tegra_pcie_dw_suspend_late(struct device *dev)
@@ -2483,7 +2481,7 @@ static const struct dev_pm_ops tegra_pcie_dw_pm_ops = {
 
 static struct platform_driver tegra_pcie_dw_driver = {
 	.probe = tegra_pcie_dw_probe,
-	.remove = tegra_pcie_dw_remove,
+	.remove_new = tegra_pcie_dw_remove,
 	.shutdown = tegra_pcie_dw_shutdown,
 	.driver = {
 		.name	= "tegra194-pcie",