linux-kernel - Re: [PATCH v2] PM / OPP: Implement opp_remove and free_opp

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Message-ID: <CAKohpo=UgVoBL2xNBwe_AoqtCOYj4Rcc=vHh2kb=64UHLjjiAw@mail.gmail.com>
Date:	Wed, 21 May 2014 13:25:28 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Inderpal Singh <inderpal.s@...sung.com>
Cc:	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nishanth Menon <nm@...com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Pavel Machek <pavel@....cz>
Subject: Re: [PATCH v2] PM / OPP: Implement opp_remove and free_opp_table functions

On 21 May 2014 11:21, Inderpal Singh <inderpal.s@...sung.com> wrote:
> At the driver unloading time the associated opps and its table may need
> to be deleted. Otherwise it amounts to memory leak. The existing
> OPP library does not have provision to do so.
>
> Hence this patch implements the required functions to free the same.
>
> Signed-off-by: Inderpal Singh <inderpal.s@...sung.com>
> ---
> Changes in v2:
>         - As suggested by Nishanth, added support to remove a single OPP
>           for non-DT users
>         - Added an internal helper function to avoid the code duplication
>           between opp_remove and free_opp_table functions
>
>  drivers/base/power/opp.c | 122 ++++++++++++++++++++++++++++++++++++++++++++++-
>  include/linux/pm_opp.h   |  14 +++++-
>  2 files changed, 134 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
> index faae9cf..22adef3 100644
> --- a/drivers/base/power/opp.c
> +++ b/drivers/base/power/opp.c
> @@ -89,6 +89,7 @@ struct device_opp {
>         struct device *dev;
>         struct srcu_notifier_head head;
>         struct list_head opp_list;
> +       struct rcu_head head_rcu;

This isn't used ...

>  };
>
>  /*
> @@ -427,7 +428,6 @@ int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
>                                 __func__);
>                         return -ENOMEM;
>                 }
> -

Unrelated change.
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