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

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Message-ID: <20200706095821.GB26377@e121166-lin.cambridge.arm.com>
Date:   Mon, 6 Jul 2020 10:58:21 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     kjlu@....edu, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stanimir Varbanov <svarbanov@...sol.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: qcom: fix runtime pm imbalance on error

On Wed, May 20, 2020 at 04:58:37PM +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.
> 
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index 138e1a2d21cc..35686930df1d 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -1340,8 +1340,7 @@ static int qcom_pcie_probe(struct platform_device *pdev)
>  	pm_runtime_enable(dev);
>  	ret = pm_runtime_get_sync(dev);
>  	if (ret < 0) {
> -		pm_runtime_disable(dev);
> -		return ret;
> +		goto err_pm_runtime_put;

I think you need to remove the brackets - this become a single line
if statement.

Lorenzo

>  	}
>  
>  	pci->dev = dev;
> -- 
> 2.17.1
>