linux-kernel - [PATCH] PCI: qcom: handle pm_runtime_get

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Message-Id: <20200605031643.18171-1-navid.emamdoost@gmail.com>
Date:   Thu,  4 Jun 2020 22:16:43 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     Stanimir Varbanov <svarbanov@...sol.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     emamd001@....edu, wu000273@....edu, kjlu@....edu,
        mccamant@...umn.edu, Navid Emamdoost <navid.emamdoost@...il.com>
Subject: [PATCH] PCI: qcom: handle pm_runtime_get_sync failure case

Calling pm_runtime_get_sync increments the counter even in case of
failure, causing incorrect ref count. Call pm_runtime_put if
pm_runtime_get_sync fails.

Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 138e1a2d21cc..48c434e6e915 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1339,10 +1339,8 @@ 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;
-	}
+	if (ret < 0)
+		goto err_pm_runtime_put;
 
 	pci->dev = dev;
 	pci->ops = &dw_pcie_ops;
-- 
2.17.1