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Commit 46b51eb9 authored by Anisse Astier's avatar Anisse Astier Committed by Len Brown
Browse files

msi-wmi: rework init 



There should be less code duplication with usage of gotos
Driver won't load if there's no hardware to control
Safer error handling at input driver allocation

Signed-off-by: default avatarAnisse Astier <anisse@astier.eu>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent addd65aa

drivers/platform/x86/msi-wmi.c

+35 −29
Original line number Diff line number Diff line
@@ -284,6 +284,8 @@ static int __init msi_wmi_input_setup(void) 
	int err;



	msi_wmi_input_dev = input_allocate_device();

	if (!msi_wmi_input_dev)

		return -ENOMEM;



	msi_wmi_input_dev->name = "MSI WMI hotkeys";

	msi_wmi_input_dev->phys = "wmi/input0";
@@ -314,40 +316,44 @@ static int __init msi_wmi_init(void) 
{

	int err;



	if (wmi_has_guid(MSIWMI_EVENT_GUID)) {

	if (!wmi_has_guid(MSIWMI_EVENT_GUID)) {

		printk(KERN_ERR

		       "This machine doesn't have MSI-hotkeys through WMI\n");

		return -ENODEV;

	}

	err = wmi_install_notify_handler(MSIWMI_EVENT_GUID,

			msi_wmi_notify, NULL);

	if (err)

		return -EINVAL;



	err = msi_wmi_input_setup();

		if (err) {

			wmi_remove_notify_handler(MSIWMI_EVENT_GUID);

			return -EINVAL;

		}

	if (err)

		goto err_uninstall_notifier;



	if (!acpi_video_backlight_support()) {

		backlight = backlight_device_register(DRV_NAME,

				NULL, NULL, &msi_backlight_ops);

			if (IS_ERR(backlight)) {

				wmi_remove_notify_handler(MSIWMI_EVENT_GUID);

				input_unregister_device(msi_wmi_input_dev);

				return -EINVAL;

			}

		if (IS_ERR(backlight))

			goto err_free_input;



		backlight->props.max_brightness = ARRAY_SIZE(backlight_map) - 1;

		err = bl_get(NULL);

			if (err < 0) {

				wmi_remove_notify_handler(MSIWMI_EVENT_GUID);

				input_unregister_device(msi_wmi_input_dev);

				backlight_device_unregister(backlight);

				return -EINVAL;

			}

		if (err < 0)

			goto err_free_backlight;



		backlight->props.brightness = err;

	}

	}

	printk(KERN_INFO DRV_PFX "Event handler installed\n");



	return 0;



err_free_backlight:

	backlight_device_unregister(backlight);

err_free_input:

	input_unregister_device(msi_wmi_input_dev);

err_uninstall_notifier:

	wmi_remove_notify_handler(MSIWMI_EVENT_GUID);

	return err;

}



static void __exit msi_wmi_exit(void)