linux-kernel - Re: [PATCH] ACPI: acpi_pad: Fix memory leak in power saving threads

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Date:   Fri, 30 Mar 2018 12:08:10 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Lenny Szubowicz <lszubowi@...hat.com>
Cc:     lenb@...nel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI: acpi_pad: Fix memory leak in power saving threads

On Tuesday, March 27, 2018 3:56:40 PM CEST Lenny Szubowicz wrote:
> Fix once per second (round_robin_time) memory leak of about 1 KB in
> each acpi_pad kernel idling thread that is activated.
> 
> Found by testing with kmemleak.
> 
> Signed-off-by: Lenny Szubowicz <lszubowi@...hat.com>
> ---
>  drivers/acpi/acpi_pad.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
> index 7544310..552c1f7 100644
> --- a/drivers/acpi/acpi_pad.c
> +++ b/drivers/acpi/acpi_pad.c
> @@ -110,6 +110,7 @@ static void round_robin_cpu(unsigned int tsk_index)
>  		cpumask_andnot(tmp, cpu_online_mask, pad_busy_cpus);
>  	if (cpumask_empty(tmp)) {
>  		mutex_unlock(&round_robin_lock);
> +		free_cpumask_var(tmp);
>  		return;
>  	}
>  	for_each_cpu(cpu, tmp) {
> @@ -127,6 +128,8 @@ static void round_robin_cpu(unsigned int tsk_index)
>  	mutex_unlock(&round_robin_lock);
>  
>  	set_cpus_allowed_ptr(current, cpumask_of(preferred_cpu));
> +
> +	free_cpumask_var(tmp);
>  }
>  
>  static void exit_round_robin(unsigned int tsk_index)
> 

Applied, thanks!