linux-kernel - [PATCH v2] PCI: v3: fix missing clk_disable_unprepare() on error in v3_pci

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Date:   Tue, 3 Nov 2020 15:33:38 +0800
From:   Qinglang Miao <miaoqinglang@...wei.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>
CC:     <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Qinglang Miao <miaoqinglang@...wei.com>
Subject: [PATCH v2] PCI: v3: fix missing clk_disable_unprepare() on error in v3_pci_probe

Fix the missing clk_disable_unprepare() before return
from v3_pci_probe() in the error handling case.

Moving the clock enable later to avoid some fixes.

Fixes: 6e0832fa432e (" PCI: Collect all native drivers under drivers/pci/controller/")
Suggested-by: Rob Herring <robh@...nel.org>
Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
---
 drivers/pci/controller/pci-v3-semi.c | 40 ++++++++++++++++------------
 1 file changed, 23 insertions(+), 17 deletions(-)

diff --git a/drivers/pci/controller/pci-v3-semi.c b/drivers/pci/controller/pci-v3-semi.c
index 154a53986..90520555b 100644
--- a/drivers/pci/controller/pci-v3-semi.c
+++ b/drivers/pci/controller/pci-v3-semi.c
@@ -725,18 +725,6 @@ static int v3_pci_probe(struct platform_device *pdev)
 	host->sysdata = v3;
 	v3->dev = dev;
 
-	/* Get and enable host clock */
-	clk = devm_clk_get(dev, NULL);
-	if (IS_ERR(clk)) {
-		dev_err(dev, "clock not found\n");
-		return PTR_ERR(clk);
-	}
-	ret = clk_prepare_enable(clk);
-	if (ret) {
-		dev_err(dev, "unable to enable clock\n");
-		return ret;
-	}
-
 	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	v3->base = devm_ioremap_resource(dev, regs);
 	if (IS_ERR(v3->base))
@@ -761,17 +749,31 @@ static int v3_pci_probe(struct platform_device *pdev)
 	if (IS_ERR(v3->config_base))
 		return PTR_ERR(v3->config_base);
 
+	/* Get and enable host clock */
+	clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(clk)) {
+		dev_err(dev, "clock not found\n");
+		return PTR_ERR(clk);
+	}
+	ret = clk_prepare_enable(clk);
+	if (ret) {
+		dev_err(dev, "unable to enable clock\n");
+		return ret;
+	}
+
 	/* Get and request error IRQ resource */
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
+	if (irq < 0) {
+		clk_disable_unprepare(clk);
 		return irq;
-
+	}
 	ret = devm_request_irq(dev, irq, v3_irq, 0,
 			"PCIv3 error", v3);
 	if (ret < 0) {
 		dev_err(dev,
 			"unable to request PCIv3 error IRQ %d (%d)\n",
 			irq, ret);
+		clk_disable_unprepare(clk);
 		return ret;
 	}
 
@@ -814,13 +816,15 @@ static int v3_pci_probe(struct platform_device *pdev)
 		ret = v3_pci_setup_resource(v3, host, win);
 		if (ret) {
 			dev_err(dev, "error setting up resources\n");
+			clk_disable_unprepare(clk);
 			return ret;
 		}
 	}
 	ret = v3_pci_parse_map_dma_ranges(v3, np);
-	if (ret)
+	if (ret) {
+		clk_disable_unprepare(clk);
 		return ret;
-
+	}
 	/*
 	 * Disable PCI to host IO cycles, enable I/O buffers @3.3V,
 	 * set AD_LOW0 to 1 if one of the LB_MAP registers choose
@@ -862,8 +866,10 @@ static int v3_pci_probe(struct platform_device *pdev)
 	/* Special Integrator initialization */
 	if (of_device_is_compatible(np, "arm,integrator-ap-pci")) {
 		ret = v3_integrator_init(v3);
-		if (ret)
+		if (ret) {
+			clk_disable_unprepare(clk);
 			return ret;
+		}
 	}
 
 	/* Post-init: enable PCI memory and invalidate (master already on) */
-- 
2.23.0