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

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Message-ID: <20200520094035.GC2136208@ulmo>
Date:   Wed, 20 May 2020 11:40:35 +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>,
        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

s/even it/even when it/

> the error handling path to keep the counter balanced.
> 
> Also This driver forgets to call pm_runtime_disable() when

s/Also This/Also this/

> 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(-)

Otherwise looks correct. It's came as somewhat of a surprise to me that
pm_runtime_get_sync() increments the usage counter even on failure, but
it does indeed.

With the above fixes to the commit message:

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

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