linux-kernel - Re: [PATCH v1 3/7] powercap/dtpm: Fixup kfree for virtual node

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Message-ID: <41214f23-ddb1-f60c-5e2a-96ba161cf727@linaro.org>
Date:   Fri, 18 Feb 2022 14:17:57 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     rjw@...ysocki.net, heiko@...ech.de, lukasz.luba@....com,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Daniel Lezcano <daniel.lezcano@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH v1 3/7] powercap/dtpm: Fixup kfree for virtual node

On 17/02/2022 16:45, Ulf Hansson wrote:

[ ... ]

> Does ops->release() also resets the "dtpm" pointer to NULL? If not,
> it's good practice that it should, right?
>
> In that case, we would be calling "kfree(NULL);" the second time,
> which is perfectly fine.

So you suggest to replace:

if (ops->release)
	ops->release(dtpm);
else
	kfree(dtpm);

By:

if (ops->release) {
	ops->release(dtpm);
	dtpm = NULL;
}

kfree(dtpm);

?

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