linux-kernel - Re: [PATCH] PCI: tegra: fix runtime pm imbalance on error

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Date:   Wed, 20 May 2020 11:42:30 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     kjlu@....edu, Thierry Reding <thierry.reding@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-tegra@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: tegra: fix runtime pm imbalance on error

On Wed, May 20, 2020 at 04:40:12PM +0800, Dinghao Liu wrote:
> pm_runtime_get_sync() increments the runtime PM usage counter even
> it returns an error code. Thus a pairing decrement is needed on
> the error handling path to keep the counter balanced.
> 
> Also This driver forgets to call pm_runtime_disable() when
> pm_runtime_get_sync() returns an error code.

  Also, call pm_runtime_disable() when pm_runtime_get_sync() returns
  an error code.

> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---
>  drivers/pci/controller/pci-tegra.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
> index 3e64ba6a36a8..00236dd65b5b 100644
> --- a/drivers/pci/controller/pci-tegra.c
> +++ b/drivers/pci/controller/pci-tegra.c
> @@ -2712,7 +2712,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
>  	err = pm_runtime_get_sync(pcie->dev);
>  	if (err < 0) {
>  		dev_err(dev, "fail to enable pcie controller: %d\n", err);
> -		goto teardown_msi;
> +		goto pm_runtime_put;
>  	}
>  
>  	host->busnr = bus->start;
> @@ -2746,7 +2746,6 @@ static int tegra_pcie_probe(struct platform_device *pdev)
>  pm_runtime_put:
>  	pm_runtime_put_sync(pcie->dev);
>  	pm_runtime_disable(pcie->dev);
> -teardown_msi:
>  	tegra_pcie_msi_teardown(pcie);
>  put_resources:
>  	tegra_pcie_put_resources(pcie);
> -- 
> 2.17.1
>