Re: [PATCH v2] PCI: qcom: Fix error handling in pm_runtime support
On Fri, Aug 31, 2018 at 03:55:10PM -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.
>
> Fixes: 854b69efbdd2 ("PCI: qcom: add runtime pm support to pcie_port")
> Acked-by: Stanimir Varbanov
> Signed-off-by: Bjorn Andersson
> ---
>
> Changes since v1:
> - Dropped remove function, as this can't be called
> - Handle pm_runtime_get_sync() errors
> - Add "Fixes" tag
>
> drivers/pci/controller/dwc/pcie-qcom.c | 56 ++
> 1 file changed, 39 insertions(+), 17 deletions(-)
Applied to pci/dwc for v4.20, thanks.
Lorenzo
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c
> b/drivers/pci/controller/dwc/pcie-qcom.c
> index d2373e4d141c..3bfaad052736 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -1117,7 +1117,6 @@ 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);
> @@ -1154,7 +1153,6 @@ 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;
> }
> @@ -1244,6 +1242,12 @@ 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;
> @@ -1253,44 +1257,56 @@ 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);
> @@ -1299,10 +1315,16 @@ 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);
> +
> +
[PATCH v2] PCI: qcom: Fix error handling in pm_runtime support
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.
Fixes: 854b69efbdd2 ("PCI: qcom: add runtime pm support to pcie_port")
Acked-by: Stanimir Varbanov
Signed-off-by: Bjorn Andersson
---
Changes since v1:
- Dropped remove function, as this can't be called
- Handle pm_runtime_get_sync() errors
- Add "Fixes" tag
drivers/pci/controller/dwc/pcie-qcom.c | 56 ++
1 file changed, 39 insertions(+), 17 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c
b/drivers/pci/controller/dwc/pcie-qcom.c
index d2373e4d141c..3bfaad052736 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1117,7 +1117,6 @@ 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);
@@ -1154,7 +1153,6 @@ 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;
}
@@ -1244,6 +1242,12 @@ 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;
@@ -1253,44 +1257,56 @@ 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);
@@ -1299,10 +1315,16 @@ 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[] = {
--
2.18.0
