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

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Message-ID: <20200520095908.GD2136208@ulmo>
Date:   Wed, 20 May 2020 11:59:08 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     kjlu@....edu, Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Vidya Sagar <vidyas@...dia.com>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        linux-pci@...r.kernel.org, linux-tegra@...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 04:52:23PM +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

s/even it/even when it/

Might also be a good idea to use a different subject prefix because I
was almost not going to look at the other patch, taking this to be a
replacement for it.

Although, looking at the log we have used this same prefix for both
drivers in the past...

> the error handling path to keep the counter balanced.
> 
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---
>  drivers/pci/controller/dwc/pcie-tegra194.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
> index ae30a2fd3716..a69f9e49dcb5 100644
> --- a/drivers/pci/controller/dwc/pcie-tegra194.c
> +++ b/drivers/pci/controller/dwc/pcie-tegra194.c
> @@ -1651,8 +1651,8 @@ static int tegra_pcie_config_rp(struct tegra_pcie_dw *pcie)
>  fail_host_init:
>  	tegra_pcie_deinit_controller(pcie);
>  fail_pinctrl:
> -	pm_runtime_put_sync(dev);
>  fail_pm_get_sync:

Either of those two labels is now no longer needed. Of course it'll now
be odd to jump to fail_pm_get_sync on pinctrl_pm_select_default_state()
failure, but that's one of the reasons why label should have names
describing what they do rather than describe the failure location. I
guess we can live with that for now. I'll make a note to send a cleanup
patch for that later on.

With the fixup in the commit message and either of the labels removed:

Acked-by: Thierry Reding <treding@...dia.com>

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