linux-kernel - Re: [PATCH] PCI: tegra: handle failure case of pm_runtime_get

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Message-ID: <e595b755-ea15-48d6-1f2a-c485f0f365e2@nvidia.com>
Date:   Fri, 5 Jun 2020 06:58:03 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Navid Emamdoost <navid.emamdoost@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        <linux-tegra@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <emamd001@....edu>, <wu000273@....edu>, <kjlu@....edu>,
        <smccaman@....edu>
Subject: Re: [PATCH] PCI: tegra: handle failure case of pm_runtime_get_sync


On 05/06/2020 04:12, Navid Emamdoost wrote:
> Calling pm_runtime_get_sync increments the counter even in case of
> failure, causing incorrect ref count. Call pm_runtime_put if
> pm_runtime_get_sync fails.
> 
> Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
> ---
>  drivers/pci/controller/pci-tegra.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
> index 3e64ba6a36a8..3d4b448fd8df 100644
> --- a/drivers/pci/controller/pci-tegra.c
> +++ b/drivers/pci/controller/pci-tegra.c
> @@ -2712,6 +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);
> +		pm_runtime_put_sync(pcie->dev);
>  		goto teardown_msi;
>  	}

Same thing for this patch, there is already a put in the error path and
so it is not necessary to add the put call here. Just update the goto
label.

Jon

-- 
nvpublic