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tc1100-wmi - add error handling for device registration

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Any of the platform API functions can fail; driver should be prepared
to handle such failures. Also:

 - changed to platform_driver_probe() since the device is created
   right there with the driver;
 - added __devexit annotation to remove method;
 - fixed memory leak on module unload - named platform_device_del() is not
   enough to free platform device, need platform_device_unregister().

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Dmitry Torokhov 2009-12-04 00:36:15 -08:00 committed by Len Brown
parent 0ad3dc3af8
commit 9634a627b3
1 changed files with 30 additions and 28 deletions
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58
drivers/platform/x86/tc1100-wmi.c
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@ -47,22 +47,6 @@ MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
MODULE_LICENSE("GPL");
MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
static int tc1100_probe(struct platform_device *device);
static int tc1100_remove(struct platform_device *device);
static int tc1100_suspend(struct platform_device *device, pm_message_t state);
static int tc1100_resume(struct platform_device *device);
static struct platform_driver tc1100_driver = {
.driver = {
.name = "tc1100-wmi",
.owner = THIS_MODULE,
},
.probe = tc1100_probe,
.remove = tc1100_remove,
.suspend = tc1100_suspend,
.resume = tc1100_resume,
};
static struct platform_device *tc1100_device;
struct tc1100_data {
@ -197,13 +181,13 @@ static struct attribute_group tc1100_attribute_group = {
Driver Model
-------------------------------------------------------------------------- */
static int tc1100_probe(struct platform_device *device)
static int __init tc1100_probe(struct platform_device *device)
{
return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
}
static int tc1100_remove(struct platform_device *device)
static int __devexit tc1100_remove(struct platform_device *device)
{
sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);
@ -240,31 +224,49 @@ static int tc1100_resume(struct platform_device *dev)
return ret;
}
static struct platform_driver tc1100_driver = {
.driver = {
.name = "tc1100-wmi",
.owner = THIS_MODULE,
},
.remove = __devexit_p(tc1100_remove),
.suspend = tc1100_suspend,
.resume = tc1100_resume,
};
static int __init tc1100_init(void)
{
int result = 0;
int error;
if (!wmi_has_guid(GUID))
return -ENODEV;
result = platform_driver_register(&tc1100_driver);
if (result)
return result;
tc1100_device = platform_device_alloc("tc1100-wmi", -1);
platform_device_add(tc1100_device);
if (!tc1100_device)
return -ENOMEM;
error = platform_device_add(tc1100_device);
if (error)
goto err_device_put;
error = platform_driver_probe(&tc1100_driver, tc1100_probe);
if (error)
goto err_device_del;
printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras loaded\n");
return 0;
return result;
err_device_del:
platform_device_del(tc1100_device);
err_device_put:
platform_device_put(tc1100_device);
return error;
}
static void __exit tc1100_exit(void)
{
platform_device_del(tc1100_device);
platform_device_unregister(tc1100_device);
platform_driver_unregister(&tc1100_driver);
printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras unloaded\n");
}
module_init(tc1100_init);