linux-kernel - [PATCH] move hp-wmi's probe function to .devinit.text

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Message-Id: <1247345591-22643-17-git-send-email-u.kleine-koenig@pengutronix.de>
Date:	Sat, 11 Jul 2009 22:52:45 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org
Cc:	Frans Pop <elendil@...net.nl>,
	Larry Finger <Larry.Finger@...inger.net>,
	Len Brown <lenb@...nel.org>, Helge Deller <deller@....de>,
	Matthew Garrett <mjg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] move hp-wmi's probe function to .devinit.text

A pointer to hp_wmi_bios_setup is passed to the core via
platform_driver_register and so the function must not disappear when the
.init sections are discarded.  Otherwise (if also having HOTPLUG=y)
unbinding and binding a device to the driver via sysfs will result in an
oops as does a device being registered late.

An alternative to this patch is using platform_driver_probe instead of
platform_driver_register plus removing the pointer to the probe function
from the struct platform_driver.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc: Frans Pop <elendil@...net.nl>
Cc: Larry Finger <Larry.Finger@...inger.net>
Cc: Len Brown <lenb@...nel.org>
Cc: Helge Deller <deller@....de>
Cc: Matthew Garrett <mjg@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 drivers/platform/x86/hp-wmi.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/hp-wmi.c b/drivers/platform/x86/hp-wmi.c
index ca50856..f1f7090 100644
--- a/drivers/platform/x86/hp-wmi.c
+++ b/drivers/platform/x86/hp-wmi.c
@@ -51,7 +51,7 @@ MODULE_ALIAS("wmi:5FB7F034-2C63-45e9-BE91-3D44E2C707E4");
 #define HPWMI_WIRELESS_QUERY 0x5
 #define HPWMI_HOTKEY_QUERY 0xc
 
-static int __init hp_wmi_bios_setup(struct platform_device *device);
+static int __devinit hp_wmi_bios_setup(struct platform_device *device);
 static int __exit hp_wmi_bios_remove(struct platform_device *device);
 static int hp_wmi_resume_handler(struct platform_device *device);
 
@@ -425,7 +425,7 @@ static void cleanup_sysfs(struct platform_device *device)
 	device_remove_file(&device->dev, &dev_attr_tablet);
 }
 
-static int __init hp_wmi_bios_setup(struct platform_device *device)
+static int __devinit hp_wmi_bios_setup(struct platform_device *device)
 {
 	int err;
 	int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
-- 
1.6.3.1

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