linux-kernel - [RFC v1 1/6] platform/x86: intel_pmc_ipc: Fix error handling in ipc_pci

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Message-Id: <5d15388eeb82aed7839b6d842c26168a935c915a.1501610760.git.sathyanarayanan.kuppuswamy@linux.intel.com>
Date:   Tue,  1 Aug 2017 11:13:49 -0700
From:   sathyanarayanan.kuppuswamy@...ux.intel.com
To:     x86@...nel.org, mingo@...hat.com, qipeng.zha@...el.com,
        hpa@...or.com, dvhart@...radead.org, tglx@...utronix.de,
        andy@...radead.org
Cc:     linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        sathyaosid@...il.com,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Subject: [RFC v1 1/6] platform/x86: intel_pmc_ipc: Fix error handling in ipc_pci_probe()

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>

This patch adds proper error handling for failure cases in
ipc_pci_probe() function.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
---
 drivers/platform/x86/intel_pmc_ipc.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/x86/intel_pmc_ipc.c b/drivers/platform/x86/intel_pmc_ipc.c
index bb792a5..7b65237 100644
--- a/drivers/platform/x86/intel_pmc_ipc.c
+++ b/drivers/platform/x86/intel_pmc_ipc.c
@@ -489,33 +489,46 @@ static int ipc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	ret = pci_enable_device(pdev);
 	if (ret)
-		return ret;
+		goto release_device;
 
 	ret = pci_request_regions(pdev, "intel_pmc_ipc");
 	if (ret)
-		return ret;
+		goto disable_device;
 
 	pci_resource = pci_resource_start(pdev, 0);
 	len = pci_resource_len(pdev, 0);
 	if (!pci_resource || !len) {
 		dev_err(&pdev->dev, "Failed to get resource\n");
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto free_pci_resources;
 	}
 
 	init_completion(&ipcdev.cmd_complete);
 
 	if (request_irq(pdev->irq, ioc, 0, "intel_pmc_ipc", &ipcdev)) {
 		dev_err(&pdev->dev, "Failed to request irq\n");
-		return -EBUSY;
+		ret = -EBUSY;
+		goto free_pci_resources;
 	}
 
 	ipcdev.ipc_base = ioremap_nocache(pci_resource, len);
 	if (!ipcdev.ipc_base) {
 		dev_err(&pdev->dev, "Failed to ioremap ipc base\n");
-		free_irq(pdev->irq, &ipcdev);
 		ret = -ENOMEM;
+		goto free_irq;
 	}
 
+	return 0;
+
+free_irq:
+	free_irq(pdev->irq, &ipcdev);
+free_pci_resources:
+	pci_release_regions(pdev);
+disable_device:
+	pci_disable_device(pdev);
+release_device:
+	pci_dev_put(pdev);
+
 	return ret;
 }
 
-- 
2.7.4