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Commit be905d0f authored by Bjorn Andersson's avatar Bjorn Andersson Committed by Greg Kroah-Hartman
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PCI: qcom: Fix error handling in runtime PM support 



[ Upstream commit 6e5da6f7d82474e94c2d4a38cf9ca4edbb3e03a0 ]

The driver does not cope with the fact that probe can fail in a number
of cases after enabling runtime PM on the device; this results in
warnings about "Unbalanced pm_runtime_enable". Furthermore if probe
fails after invoking qcom_pcie_host_init() the power-domain will be left
referenced.

As it is not possible for the error handling in qcom_pcie_host_init() to
handle errors happening after returning from that function the
pm_runtime_get_sync() is moved to qcom_pcie_probe() as well.

Fixes: 854b69ef ("PCI: qcom: add runtime pm support to pcie_port")
Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: default avatarStanimir Varbanov <svarbanov@mm-sol.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 476ecc14

drivers/pci/controller/dwc/pcie-qcom.c

+39 −17
Original line number Diff line number Diff line
@@ -1091,7 +1091,6 @@ static int qcom_pcie_host_init(struct pcie_port *pp) 
	struct qcom_pcie *pcie = to_qcom_pcie(pci);

	int ret;



	pm_runtime_get_sync(pci->dev);

	qcom_ep_reset_assert(pcie);



	ret = pcie->ops->init(pcie);
@@ -1128,7 +1127,6 @@ static int qcom_pcie_host_init(struct pcie_port *pp) 
	phy_power_off(pcie->phy);

err_deinit:

	pcie->ops->deinit(pcie);

	pm_runtime_put(pci->dev);



	return ret;

}
@@ -1218,6 +1216,12 @@ static int qcom_pcie_probe(struct platform_device *pdev) 
		return -ENOMEM;



	pm_runtime_enable(dev);

	ret = pm_runtime_get_sync(dev);

	if (ret < 0) {

		pm_runtime_disable(dev);

		return ret;

	}



	pci->dev = dev;

	pci->ops = &dw_pcie_ops;

	pp = &pci->pp;
@@ -1227,44 +1231,56 @@ static int qcom_pcie_probe(struct platform_device *pdev) 
	pcie->ops = of_device_get_match_data(dev);



	pcie->reset = devm_gpiod_get_optional(dev, "perst", GPIOD_OUT_LOW);

	if (IS_ERR(pcie->reset))

		return PTR_ERR(pcie->reset);

	if (IS_ERR(pcie->reset)) {

		ret = PTR_ERR(pcie->reset);

		goto err_pm_runtime_put;

	}



	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "parf");

	pcie->parf = devm_ioremap_resource(dev, res);

	if (IS_ERR(pcie->parf))

		return PTR_ERR(pcie->parf);

	if (IS_ERR(pcie->parf)) {

		ret = PTR_ERR(pcie->parf);

		goto err_pm_runtime_put;

	}



	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");

	pci->dbi_base = devm_pci_remap_cfg_resource(dev, res);

	if (IS_ERR(pci->dbi_base))

		return PTR_ERR(pci->dbi_base);

	if (IS_ERR(pci->dbi_base)) {

		ret = PTR_ERR(pci->dbi_base);

		goto err_pm_runtime_put;

	}



	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi");

	pcie->elbi = devm_ioremap_resource(dev, res);

	if (IS_ERR(pcie->elbi))

		return PTR_ERR(pcie->elbi);

	if (IS_ERR(pcie->elbi)) {

		ret = PTR_ERR(pcie->elbi);

		goto err_pm_runtime_put;

	}



	pcie->phy = devm_phy_optional_get(dev, "pciephy");

	if (IS_ERR(pcie->phy))

		return PTR_ERR(pcie->phy);

	if (IS_ERR(pcie->phy)) {

		ret = PTR_ERR(pcie->phy);

		goto err_pm_runtime_put;

	}



	ret = pcie->ops->get_resources(pcie);

	if (ret)

		return ret;

		goto err_pm_runtime_put;



	pp->ops = &qcom_pcie_dw_ops;



	if (IS_ENABLED(CONFIG_PCI_MSI)) {

		pp->msi_irq = platform_get_irq_byname(pdev, "msi");

		if (pp->msi_irq < 0)

			return pp->msi_irq;

		if (pp->msi_irq < 0) {

			ret = pp->msi_irq;

			goto err_pm_runtime_put;

		}

	}



	ret = phy_init(pcie->phy);

	if (ret) {

		pm_runtime_disable(&pdev->dev);

		return ret;

		goto err_pm_runtime_put;

	}



	platform_set_drvdata(pdev, pcie);
@@ -1273,10 +1289,16 @@ static int qcom_pcie_probe(struct platform_device *pdev) 
	if (ret) {

		dev_err(dev, "cannot initialize host\n");

		pm_runtime_disable(&pdev->dev);

		return ret;

		goto err_pm_runtime_put;

	}



	return 0;



err_pm_runtime_put:

	pm_runtime_put(dev);

	pm_runtime_disable(dev);



	return ret;

}



static const struct of_device_id qcom_pcie_match[] = {