linux-kernel - Re: [PATCH v2] thermal: Fail object registration if thermal class is not registered

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Message-ID: <Y9APkJ8TfGu36iug@kroah.com>
Date:   Tue, 24 Jan 2023 18:04:16 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux PM <linux-pm@...r.kernel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Zhang Rui <rui.zhang@...el.com>
Subject: Re: [PATCH v2] thermal: Fail object registration if thermal class is
 not registered

On Mon, Jan 23, 2023 at 09:44:03PM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> If thermal_class is not registered with the driver core, there is no way
> to expose the interfaces used by the thermal control framework, so
> prevent thermal zones and cooling devices from being registered in
> that case by returning an error from object registration functions.
> 
> For this purpose, use a thermal_class pointer that will be NULL if the
> class is not registered.  To avoid wasting memory in that case, allocate
> the thermal class object dynamically and if it fails to register, free
> it and clear the thermal_class pointer to NULL.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
> 
> -> v2: This replaces the series at
>        https://lore.kernel.org/linux-pm/5905717.lOV4Wx5bFT@kreacher/

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>