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SubjectRe: [PATCH] PCI: qcom: Fix error handling in pm_runtime support
On Fri, May 25, 2018 at 12:09:34PM -0700, Bjorn Andersson wrote:
> The driver does not cope with the fact that probe can fail in a number
> of cases after enabling pm_runtime on the device, this results in
> warnings about "Unbalanced pm_runtime_enable". Further more if probe
> fails after invoking host_init the power-domain will be left referenced.
>
> As it's 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 probe() as well.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
>
> I'm sorry for not spotting this last week when we discussed the previous patch.

I need Stanimir's ACK to merge it, thanks.

Lorenzo

> drivers/pci/dwc/pcie-qcom.c | 65 ++++++++++++++++++++++++++-----------
> 1 file changed, 46 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/pci/dwc/pcie-qcom.c b/drivers/pci/dwc/pcie-qcom.c
> index 3f35098b71b1..f2453196278f 100644
> --- a/drivers/pci/dwc/pcie-qcom.c
> +++ b/drivers/pci/dwc/pcie-qcom.c
> @@ -1088,8 +1088,6 @@ 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);
> @@ -1126,7 +1124,6 @@ static int qcom_pcie_host_init(struct pcie_port *pp)
> phy_power_off(pcie->phy);
> err_deinit:
> pcie->ops->deinit(pcie);
> - pm_runtime_put_sync(pci->dev);
>
> return ret;
> }
> @@ -1207,7 +1204,6 @@ static int qcom_pcie_probe(struct platform_device *pdev)
> struct qcom_pcie *pcie;
> int ret;
>
> -
> pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
> if (!pcie)
> return -ENOMEM;
> @@ -1217,6 +1213,7 @@ static int qcom_pcie_probe(struct platform_device *pdev)
> return -ENOMEM;
>
> pm_runtime_enable(dev);
> + pm_runtime_get_sync(dev);
>
> pci->dev = dev;
> pci->ops = &dw_pcie_ops;
> @@ -1227,53 +1224,82 @@ 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->root_bus_nr = -1;
> 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)
> - return ret;
> + goto err_pm_runtime_put;
>
> platform_set_drvdata(pdev, pcie);
>
> ret = dw_pcie_host_init(pp);
> if (ret) {
> dev_err(dev, "cannot initialize host\n");
> - return ret;
> + goto err_pm_runtime_put;
> }
>
> + return 0;
> +
> +err_pm_runtime_put:
> + pm_runtime_put(dev);
> + pm_runtime_disable(dev);
> +
> + return ret;
> +}
> +
> +static int qcom_pcie_remove(struct platform_device *pdev)
> +{
> + struct qcom_pcie *pcie = platform_get_drvdata(pdev);
> + struct device *dev = pcie->pci->dev;
> +
> + pm_runtime_put(dev);
> + pm_runtime_disable(dev);
> +
> return 0;
> }
>
> @@ -1289,6 +1315,7 @@ static const struct of_device_id qcom_pcie_match[] = {
>
> static struct platform_driver qcom_pcie_driver = {
> .probe = qcom_pcie_probe,
> + .remove = qcom_pcie_remove,
> .driver = {
> .name = "qcom-pcie",
> .suppress_bind_attrs = true,
> --
> 2.17.0
>

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