linux-kernel - Re: [PATCH v2] PCI: tegra: Fix return value check of pm_runtime_get

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Message-ID: <20191216112043.GS24359@e119886-lin.cambridge.arm.com>
Date:   Mon, 16 Dec 2019 11:20:43 +0000
From:   Andrew Murray <andrew.murray@....com>
To:     David Engraf <david.engraf@...go.com>
Cc:     thierry.reding@...il.com, lorenzo.pieralisi@....com,
        bhelgaas@...gle.com, jonathanh@...dia.com,
        linux-tegra@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] PCI: tegra: Fix return value check of
 pm_runtime_get_sync

On Mon, Dec 16, 2019 at 12:18:25PM +0100, David Engraf wrote:
> pm_runtime_get_sync() returns the device's usage counter. This might
> be >0 if the device is already powered up or CONFIG_PM is disabled.
> 
> Abort probe function on real error only.
> 
> Fixes: da76ba50963b ("PCI: tegra: Add power management support")
> Signed-off-by: David Engraf <david.engraf@...go.com>

Thanks for this - apologies my feedback wasn't as quick as your respin.

Acked-by: Andrew Murray <andrew.murray@....com>

> ---
>  drivers/pci/controller/pci-tegra.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
> index 673a1725ef38..090b632965e2 100644
> --- a/drivers/pci/controller/pci-tegra.c
> +++ b/drivers/pci/controller/pci-tegra.c
> @@ -2798,7 +2798,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
>  
>  	pm_runtime_enable(pcie->dev);
>  	err = pm_runtime_get_sync(pcie->dev);
> -	if (err) {
> +	if (err < 0) {
>  		dev_err(dev, "fail to enable pcie controller: %d\n", err);
>  		goto teardown_msi;
>  	}
> -- 
> 2.17.1
>