linux-kernel - Re: [PATCH] ACPI / cpuidle: remove superfluous pr == NULL checks

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Date:	Fri, 30 Aug 2013 14:03:11 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:	Len Brown <lenb@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-pm@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI / cpuidle: remove superfluous pr == NULL checks

On Friday, August 30, 2013 12:30:51 PM Bartlomiej Zolnierkiewicz wrote:
> The only acpi_processor_get_power_info_fadt() user
> (acpi_processor_get_power_info()) dereferences pr before calling
> the function.
> 
> The only acpi_processor_hotplug() user (acpi_cpu_soft_notify())
> checks for pr == NULL before calling the function.
> 
> The only acpi_processor_cst_has_changed() user (acpi_processor_notify())
> checks for pr == NULL before calling the function.
> 
> The only acpi_processor_power_init() user (__acpi_processor_start())
> dereferences pr before calling the function.
> 
> Thus remove superfluous pr == NULL checks from affected functions.
> 
> Also:
> 
> While at it remove redundant brackets from acpi_processor_hotplug().
> 
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
> Cc: Len Brown <lenb@...nel.org>

Thanks, I'll queue this up for 3.13.


> ---
>  drivers/acpi/processor_idle.c | 15 +--------------
>  1 file changed, 1 insertion(+), 14 deletions(-)
> 
> diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
> index f98dd00..35c8f2b 100644
> --- a/drivers/acpi/processor_idle.c
> +++ b/drivers/acpi/processor_idle.c
> @@ -272,9 +272,6 @@ static void tsc_check_state(int state) { return; }
>  static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
>  {
>  
> -	if (!pr)
> -		return -EINVAL;
> -
>  	if (!pr->pblk)
>  		return -ENODEV;
>  
> @@ -1076,12 +1073,8 @@ int acpi_processor_hotplug(struct acpi_processor *pr)
>  	if (disabled_by_idle_boot_param())
>  		return 0;
>  
> -	if (!pr)
> -		return -EINVAL;
> -
> -	if (nocst) {
> +	if (nocst)
>  		return -ENODEV;
> -	}
>  
>  	if (!pr->flags.power_setup_done)
>  		return -ENODEV;
> @@ -1108,9 +1101,6 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr)
>  	if (disabled_by_idle_boot_param())
>  		return 0;
>  
> -	if (!pr)
> -		return -EINVAL;
> -
>  	if (nocst)
>  		return -ENODEV;
>  
> @@ -1183,9 +1173,6 @@ int acpi_processor_power_init(struct acpi_processor *pr)
>  		first_run++;
>  	}
>  
> -	if (!pr)
> -		return -EINVAL;
> -
>  	if (acpi_gbl_FADT.cst_control && !nocst) {
>  		status =
>  		    acpi_os_write_port(acpi_gbl_FADT.smi_command, acpi_gbl_FADT.cst_control, 8);
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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