[PATCH] [v3] PCI: rcar: Fix runtime PM imbalance on error

[PATCH] [v3] PCI: rcar: Fix runtime PM imbalance on error

[Dinghao Liu]

pm_runtime_get_sync() increments the runtime PM usage counter even
the call returns an error code. Thus a corresponding decrement is
needed on the error handling path to keep the counter balanced.

Fixes: 0df6150e7ceb ("PCI: rcar: Use runtime PM to control controller
clock")

Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
---

Changelog:

v2: - Remove unnecessary 'err_pm_put' label.
      Refine commit message.

v3: - Add Fixes tag.
      Rebase the patch on top of the latest kernel.
---
 drivers/pci/controller/pcie-rcar-host.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c
index d210a36561be..060c24f5221e 100644
--- a/drivers/pci/controller/pcie-rcar-host.c
+++ b/drivers/pci/controller/pcie-rcar-host.c
@@ -986,7 +986,7 @@ static int rcar_pcie_probe(struct platform_device *pdev)
 	err = pm_runtime_get_sync(pcie->dev);
 	if (err < 0) {
 		dev_err(pcie->dev, "pm_runtime_get_sync failed\n");
-		goto err_pm_disable;
+		goto err_pm_put;
 	}
 
 	err = rcar_pcie_get_resources(host);
@@ -1057,8 +1057,6 @@ static int rcar_pcie_probe(struct platform_device *pdev)
 
 err_pm_put:
 	pm_runtime_put(dev);
-
-err_pm_disable:
 	pm_runtime_disable(dev);
 	pci_free_resource_list(&host->resources);
 
-- 
2.17.1

Re: [PATCH] [v3] PCI: rcar: Fix runtime PM imbalance on error

[Lorenzo Pieralisi]

On Thu, Jul 09, 2020 at 02:43:56PM +0800, Dinghao Liu wrote:
> pm_runtime_get_sync() increments the runtime PM usage counter even
> the call returns an error code. Thus a corresponding decrement is
> needed on the error handling path to keep the counter balanced.
> 
> Fixes: 0df6150e7ceb ("PCI: rcar: Use runtime PM to control controller
> clock")
> 
> Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>

Applied to pci/runtime-pm but you forgot to carry over Yoshihiro's
reviewed-by, please do pay attention to these details.

Lorenzo

> ---
> 
> Changelog:
> 
> v2: - Remove unnecessary 'err_pm_put' label.
>       Refine commit message.
> 
> v3: - Add Fixes tag.
>       Rebase the patch on top of the latest kernel.
> ---
>  drivers/pci/controller/pcie-rcar-host.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c
> index d210a36561be..060c24f5221e 100644
> --- a/drivers/pci/controller/pcie-rcar-host.c
> +++ b/drivers/pci/controller/pcie-rcar-host.c
> @@ -986,7 +986,7 @@ static int rcar_pcie_probe(struct platform_device *pdev)
>  	err = pm_runtime_get_sync(pcie->dev);
>  	if (err < 0) {
>  		dev_err(pcie->dev, "pm_runtime_get_sync failed\n");
> -		goto err_pm_disable;
> +		goto err_pm_put;
>  	}
>  
>  	err = rcar_pcie_get_resources(host);
> @@ -1057,8 +1057,6 @@ static int rcar_pcie_probe(struct platform_device *pdev)
>  
>  err_pm_put:
>  	pm_runtime_put(dev);
> -
> -err_pm_disable:
>  	pm_runtime_disable(dev);
>  	pci_free_resource_list(&host->resources);
>  
> -- 
> 2.17.1
>