linux-kernel - [PATCH] PCI: qcom: Fix an error handling path in 'qcom_pcie

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Message-Id: <4d03c636193f64907c8dacb17fa71ed05fd5f60c.1636220582.git.christophe.jaillet@wanadoo.fr>
Date:   Sat,  6 Nov 2021 18:44:52 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     agross@...nel.org, bjorn.andersson@...aro.org,
        svarbanov@...sol.com, lorenzo.pieralisi@....com, robh@...nel.org,
        kw@...ux.com, bhelgaas@...gle.com, pmaliset@...eaurora.org,
        swboyd@...omium.org
Cc:     linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] PCI: qcom: Fix an error handling path in 'qcom_pcie_probe()'

If 'of_device_get_match_data()' fails, previous 'pm_runtime_get_sync()/
pm_runtime_enable()' should be undone.

To fix it, the easiest is to move this block of code before the memory
allocations and the pm_runtime_xxx calls.

Fixes: b89ff410253d ("PCI: qcom: Replace ops with struct pcie_cfg in pcie match data")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 1c3d1116bb60..baae67f71ba8 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1534,6 +1534,12 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 	const struct qcom_pcie_cfg *pcie_cfg;
 	int ret;
 
+	pcie_cfg = of_device_get_match_data(dev);
+	if (!pcie_cfg || !pcie_cfg->ops) {
+		dev_err(dev, "Invalid platform data\n");
+		return -EINVAL;
+	}
+
 	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
 	if (!pcie)
 		return -ENOMEM;
@@ -1553,12 +1559,6 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 
 	pcie->pci = pci;
 
-	pcie_cfg = of_device_get_match_data(dev);
-	if (!pcie_cfg || !pcie_cfg->ops) {
-		dev_err(dev, "Invalid platform data\n");
-		return -EINVAL;
-	}
-
 	pcie->ops = pcie_cfg->ops;
 	pcie->pipe_clk_need_muxing = pcie_cfg->pipe_clk_need_muxing;
 
-- 
2.30.2