linux-kernel - Re: [PATCH] spi: tegra20-slink: Fix runtime PM imbalance on error

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Message-ID: <CAHp75VfOeUaqRW2vRwyWaz3JJw41hX5jTgE+kZ8pB8E_HtHwqw@mail.gmail.com>
Date:   Thu, 21 May 2020 11:04:41 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     Kangjie Lu <kjlu@....edu>, Laxman Dewangan <ldewangan@...dia.com>,
        Mark Brown <broonie@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-spi <linux-spi@...r.kernel.org>,
        linux-tegra@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] spi: tegra20-slink: Fix runtime PM imbalance on error

On Thu, May 21, 2020 at 10:50 AM Dinghao Liu <dinghao.liu@....edu.cn> wrote:
>
> pm_runtime_get_sync() increments the runtime PM usage counter even
> when it returns an error code. Thus a pairing decrement is needed on
> the error handling path to keep the counter balanced.

...

>         ret = pm_runtime_get_sync(&pdev->dev);
>         if (ret < 0) {
>                 dev_err(&pdev->dev, "pm runtime get failed, e = %d\n", ret);

> +               pm_runtime_put(&pdev->dev);

For all your patches, please, double check what you are proposing.

Here, I believe, the correct one will be _put_noidle().

AFAIU you are not supposed to actually suspend the device in case of error.
But I might be mistaken, thus see above.

>                 goto exit_pm_disable;
>         }

-- 
With Best Regards,
Andy Shevchenko