linux-kernel - [PATCH V2] PCI: qcom: Improve exception handling in qcom_pcie

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Message-Id: <20200527025531.32357-1-wu000273@umn.edu>
Date:   Tue, 26 May 2020 21:55:31 -0500
From:   wu000273@....edu
To:     svarbanov@...sol.com
Cc:     agross@...nel.org, bjorn.andersson@...aro.org,
        lorenzo.pieralisi@....com, robh@...nel.org, helgaas@...gle.com,
        p.zabel@...gutronix.de, linux-pci@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Markus.Elfring@....de, kjlu@....edu, wu000273@....edu
Subject: [PATCH V2] PCI: qcom: Improve exception handling in qcom_pcie_probe().

From: Qiushi Wu <wu000273@....edu>

This function contained improvable implementation details according to
exception handling.
1. pm_runtime_put() should be called after pm_runtime_get_sync() failed,
because the reference count will be increased despite of the failure.
Thus add the missed function call.
2. pm_runtime_disable() are called twice, after the call of phy_init() and
dw_pcie_host_init() failed. Thus remove redundant function calls.


Fixes: 6e5da6f7d824 ("PCI: qcom: Fix error handling in runtime PM support")
Co-developed-by: Markus Elfring <Markus.Elfring@....de>
Signed-off-by: Markus Elfring <Markus.Elfring@....de>
Signed-off-by: Qiushi Wu <wu000273@....edu>
---
 V2: words adjustments and fix some typos 
 drivers/pci/controller/dwc/pcie-qcom.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 138e1a2d21cc..10393ab607bf 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1340,8 +1340,7 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 	pm_runtime_enable(dev);
 	ret = pm_runtime_get_sync(dev);
 	if (ret < 0) {
-		pm_runtime_disable(dev);
-		return ret;
+		goto err_pm_runtime_put;
 	}
 
 	pci->dev = dev;
@@ -1401,7 +1400,6 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 
 	ret = phy_init(pcie->phy);
 	if (ret) {
-		pm_runtime_disable(&pdev->dev);
 		goto err_pm_runtime_put;
 	}
 
@@ -1410,7 +1408,6 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 	ret = dw_pcie_host_init(pp);
 	if (ret) {
 		dev_err(dev, "cannot initialize host\n");
-		pm_runtime_disable(&pdev->dev);
 		goto err_pm_runtime_put;
 	}
 
-- 
2.17.1