linux-kernel - Re: [PATCH v3 2/2] PM / devfreq: Add governor attribute flag for specifc sysfs nodes

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Message-ID: <4cb8ece7-9399-9ee0-5f93-6c19630308d6@gmail.com>
Date:   Mon, 19 Oct 2020 03:39:35 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Chanwoo Choi <cw00.choi@...sung.com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Cc:     leonard.crestez@....com, lukasz.luba@....com,
        enric.balletbo@...labora.com, hl@...k-chips.com,
        thierry.reding@...il.com, jonathanh@...dia.com, abel.vesa@....com,
        k.konieczny@...sung.com, b.zolnierkie@...sung.com,
        chanwoo@...nel.org, myungjoo.ham@...sung.com,
        kyungmin.park@...sung.com
Subject: Re: [PATCH v3 2/2] PM / devfreq: Add governor attribute flag for
 specifc sysfs nodes

...
> @@ -1361,6 +1373,9 @@ static ssize_t governor_store(struct device *dev, struct device_attribute *attr,
>  		goto out;
>  	}
>  
> +	remove_sysfs_files(df, df->governor);
> +	create_sysfs_files(df, governor);
> +
>  	prev_governor = df->governor;
>  	df->governor = governor;
>  	strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN);
> @@ -1460,39 +1475,6 @@ static ssize_t target_freq_show(struct device *dev,
>  }

The further code may revert df->governor to the prev_governor or set it
to NULL. The create_sysfs_files(df->governor) should be invoked at the
very end of the governor_store() and only in a case of success.