linux-kernel - Re: [PATCH] opp: of: drop incorrect lockdep_assert

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Message-ID: <20191023053005.m4y4bcebgi4km35q@vireshk-i7>
Date:   Wed, 23 Oct 2019 11:00:05 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Rafael Wysocki <rjw@...ysocki.net>,
        "v5 . 0+" <stable@...r.kernel.org>,
        Niklas Cassel <niklas.cassel@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] opp: of: drop incorrect lockdep_assert_held()

On 10-10-19, 16:00, Viresh Kumar wrote:
> _find_opp_of_np() doesn't traverse the list of OPP tables but instead
> just the entries within an OPP table and so only requires to lock the
> OPP table itself.
> 
> The lockdep_assert_held() was added there by mistake and isn't really
> required.
> 
> Fixes: 5d6d106fa455 ("OPP: Populate required opp tables from "required-opps" property")
> Cc: v5.0+ <stable@...r.kernel.org> # v5.0+
> Reported-by: Niklas Cassel <niklas.cassel@...aro.org>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  drivers/opp/of.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/opp/of.c b/drivers/opp/of.c
> index 1813f5ad5fa2..6dc41faf74b5 100644
> --- a/drivers/opp/of.c
> +++ b/drivers/opp/of.c
> @@ -77,8 +77,6 @@ static struct dev_pm_opp *_find_opp_of_np(struct opp_table *opp_table,
>  {
>  	struct dev_pm_opp *opp;
>  
> -	lockdep_assert_held(&opp_table_lock);
> -
>  	mutex_lock(&opp_table->lock);
>  
>  	list_for_each_entry(opp, &opp_table->opp_list, node) {

@Niklas, any inputs from your side  here would be appreciated :)

-- 
viresh