linux-kernel - Re: [PATCH 1/9] eeepc-laptop: clean up coding style

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Date:	Wed, 17 Sep 2014 15:06:52 -0700
From:	Joe Perches <joe@...ches.com>
To:	Frans Klaver <fransklaver@...il.com>
Cc:	Darren Hart <dvhart@...radead.org>,
	Corentin Chary <corentin.chary@...il.com>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	acpi4asus-user@...ts.sourceforge.net,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/9] eeepc-laptop: clean up coding style

On Wed, 2014-09-17 at 23:47 +0200, Frans Klaver wrote:
> Correct indentation and brace usage to comply with
> Documentation/CodingStyle.
> 
> Signed-off-by: Frans Klaver <fransklaver@...il.com>
> ---
>  drivers/platform/x86/eeepc-laptop.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/platform/x86/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c
> index 3095d38..653999e 100644
> --- a/drivers/platform/x86/eeepc-laptop.c
> +++ b/drivers/platform/x86/eeepc-laptop.c
> @@ -544,7 +544,7 @@ static int eeepc_led_init(struct eeepc_laptop *eeepc)
>  	eeepc->tpd_led.name = "eeepc::touchpad";
>  	eeepc->tpd_led.brightness_set = tpd_led_set;
>  	if (get_acpi(eeepc, CM_ASL_TPD) >= 0) /* if method is available */
> -	  eeepc->tpd_led.brightness_get = tpd_led_get;
> +		eeepc->tpd_led.brightness_get = tpd_led_get;
>  	eeepc->tpd_led.max_brightness = 1;
>  
>  	rv = led_classdev_register(&eeepc->platform_device->dev,
> @@ -692,8 +692,9 @@ static int eeepc_register_rfkill_notifier(struct eeepc_laptop *eeepc,
>  		 * changed during setup.
>  		 */
>  		eeepc_rfkill_hotplug(eeepc, handle);
> -	} else
> +	} else {
>  		return -ENODEV;
> +	}
>  
>  	return 0;
>  }

This sort of code:

	if (foo) {
		[ do_something ]
	} else
		return -ERRVAL;

is generally better rewritten as:

	if (!foo)
		return -ERRVAL;

	[ do_something ]

This gives immediacy to the error handler and
as well reduces unnecessary indentation.

So instead of:

static int eeepc_register_rfkill_notifier(struct eeepc_laptop *eeepc,
					  char *node)
{
	acpi_status status;
	acpi_handle handle;

	status = acpi_get_handle(NULL, node, &handle);

	if (ACPI_SUCCESS(status)) {
		status = acpi_install_notify_handler(handle,
						     ACPI_SYSTEM_NOTIFY,
						     eeepc_rfkill_notify,
						     eeepc);
		if (ACPI_FAILURE(status))
			pr_warn("Failed to register notify on %s\n", node);

		/*
		 * Refresh pci hotplug in case the rfkill state was
		 * changed during setup.
		 */
		eeepc_rfkill_hotplug(eeepc, handle);
	} else
		return -ENODEV;

	return 0;
}

try something like:

static int eeepc_register_rfkill_notifier(struct eeepc_laptop *eeepc,
					  char *node)
{
	acpi_handle handle;
	acpi_status status = acpi_get_handle(NULL, node, &handle);

	if (!ACPI_SUCCESS(status))
		return -ENODEV;

	status = acpi_install_notify_handler(handle,
					     ACPI_SYSTEM_NOTIFY,
					     eeepc_rfkill_notify,
					     eeepc);
	if (ACPI_FAILURE(status))
		pr_warn("Failed to register notify on %s\n", node);

	/*
	 * Refresh pci hotplug in case the rfkill state was
	 * changed during setup.
	 */
	eeepc_rfkill_hotplug(eeepc, handle);

	return 0;
}


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