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asus-laptop: Fix rmmod of asus_laptop 

The asus laptop driver conditionnaly registers leds in asus_led_register()
depending on their availability, but unconditionnaly unregisters them all at
exit time or when the module fails to load. Unregistering not registered leds
result in the following Oops. So we should check before unregistering.

 [<c032d2f9>] do_page_fault+0x511/0x5e9
 [<c032bae2>] error_code+0x6a/0x70
 [<c026abf8>] device_unregister+0x26/0x32
 [<f8864218>] led_classdev_unregister+0x58/0x94 [led_class]
 [<f88a90f8>] asus_led_exit+0x17/0x41 [asus_laptop]
 [<f88a91c9>] asus_laptop_exit+0xd/0x3f [asus_laptop]
 [<c013cee1>] sys_delete_module+0x17b/0x1a2
 [<c0106eae>] sysenter_past_esp+0x6b/0xa1

EIP: [<c026a9a3>] device_del+0xb/0x23a SS:ESP 0068:f594ef0c

Signed-off-by: Guillaume Chazarain <guichaz@yahoo.fr>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Guillaume Chazarain 2007-08-16 18:18:53 +02:00 committed by Len Brown
parent b377fd3982
commit e1996a69e1
1 changed files with 2 additions and 1 deletions
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3
drivers/misc/asus-laptop.c
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@ -1072,7 +1072,8 @@ static void asus_backlight_exit(void)
}
#define ASUS_LED_UNREGISTER(object) \
led_classdev_unregister(&object##_led)
if (object##_led.dev) \
led_classdev_unregister(&object##_led)
static void asus_led_exit(void)
{