linux-kernel - Re: [PATCH 1/2] PM: domains: call mutex

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Date:   Tue, 15 Jun 2021 15:51:53 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] PM: domains: call mutex_destroy when removing the
 genpd

On Fri, Jun 11, 2021 at 01:15:39PM +0300, Dmitry Baryshkov wrote:
> It is a good practice to destroy mutexes with mutex_destroy, so call
> this function for releasing genpd->mlock.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>  drivers/base/power/domain.c | 25 ++++++++++++++++++++-----
>  1 file changed, 20 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index b6a782c31613..74219d032910 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -1910,6 +1910,11 @@ static void genpd_lock_init(struct generic_pm_domain *genpd)
>  	}
>  }
>  
> +static void genpd_lock_destroy(struct generic_pm_domain *genpd) {
> +	if (!(genpd->flags & GENPD_FLAG_IRQ_SAFE))
> +		mutex_destroy(&genpd->mlock);
> +}

Did you run this through checkpatch.pl???

And what does mutex_destroy() do that is required here?

thanks,

greg k-h