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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2013-02-20 00:44:34 -0800
committerMatthew Garrett <matthew.garrett@nebula.com>2013-02-27 08:30:43 -0500
commitc165b80cfecc5f253e93ebd133f7c53cf81d82d5 (patch)
treef2b116203238dce30af1226574b6451f38905d6f /drivers/platform/x86
parent34cf1df34aba1a6274deeef92ad6d02d5f52dab0 (diff)
downloadlinux-linaro-stable-c165b80cfecc5f253e93ebd133f7c53cf81d82d5.tar.gz
hp-wmi: fix handling of platform device
The driver will not quite work if someone unbinds the platform device from the platform driver via sysfs (moreover it will bomb is the driver built into the kernel as hp_wmi_bios_remove is marked as __exit and will not be present in the kernel). To fix it let's use platform_driver_probe() instead of platform_driver_register(), which disables binding/unbinding via sysfs. This also allows us to mark hp_wmi_bios_setup as __init and discard it once module is initialized. Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
Diffstat (limited to 'drivers/platform/x86')
-rw-r--r--drivers/platform/x86/hp-wmi.c69
1 files changed, 30 insertions, 39 deletions
diff --git a/drivers/platform/x86/hp-wmi.c b/drivers/platform/x86/hp-wmi.c
index be9227dd82be..45cacf79f3a7 100644
--- a/drivers/platform/x86/hp-wmi.c
+++ b/drivers/platform/x86/hp-wmi.c
@@ -73,10 +73,6 @@ enum hp_wmi_event_ids {
HPWMI_LOCK_SWITCH = 7,
};
-static int 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 device *device);
-
struct bios_args {
u32 signature;
u32 command;
@@ -160,21 +156,6 @@ struct rfkill2_device {
static int rfkill2_count;
static struct rfkill2_device rfkill2[HPWMI_MAX_RFKILL2_DEVICES];
-static const struct dev_pm_ops hp_wmi_pm_ops = {
- .resume = hp_wmi_resume_handler,
- .restore = hp_wmi_resume_handler,
-};
-
-static struct platform_driver hp_wmi_driver = {
- .driver = {
- .name = "hp-wmi",
- .owner = THIS_MODULE,
- .pm = &hp_wmi_pm_ops,
- },
- .probe = hp_wmi_bios_setup,
- .remove = hp_wmi_bios_remove,
-};
-
/*
* hp_wmi_perform_query
*
@@ -812,7 +793,7 @@ fail:
return err;
}
-static int hp_wmi_bios_setup(struct platform_device *device)
+static int __init hp_wmi_bios_setup(struct platform_device *device)
{
int err;
@@ -917,12 +898,29 @@ static int hp_wmi_resume_handler(struct device *device)
return 0;
}
+static const struct dev_pm_ops hp_wmi_pm_ops = {
+ .resume = hp_wmi_resume_handler,
+ .restore = hp_wmi_resume_handler,
+};
+
+static struct platform_driver hp_wmi_driver = {
+ .driver = {
+ .name = "hp-wmi",
+ .owner = THIS_MODULE,
+ .pm = &hp_wmi_pm_ops,
+ },
+ .remove = __exit_p(hp_wmi_bios_remove),
+};
+
static int __init hp_wmi_init(void)
{
int err;
int event_capable = wmi_has_guid(HPWMI_EVENT_GUID);
int bios_capable = wmi_has_guid(HPWMI_BIOS_GUID);
+ if (!bios_capable && !event_capable)
+ return -ENODEV;
+
if (event_capable) {
err = hp_wmi_input_setup();
if (err)
@@ -933,34 +931,29 @@ static int __init hp_wmi_init(void)
}
if (bios_capable) {
- err = platform_driver_register(&hp_wmi_driver);
- if (err)
- goto err_driver_reg;
- hp_wmi_platform_dev = platform_device_alloc("hp-wmi", -1);
- if (!hp_wmi_platform_dev) {
- err = -ENOMEM;
- goto err_device_alloc;
+ hp_wmi_platform_dev =
+ platform_device_register_simple("hp-wmi", -1, NULL, 0);
+ if (IS_ERR(hp_wmi_platform_dev)) {
+ err = PTR_ERR(hp_wmi_platform_dev);
+ goto err_destroy_input;
}
- err = platform_device_add(hp_wmi_platform_dev);
+
+ err = platform_driver_probe(&hp_wmi_driver, hp_wmi_bios_setup);
if (err)
- goto err_device_add;
+ goto err_unregister_device;
}
- if (!bios_capable && !event_capable)
- return -ENODEV;
-
return 0;
-err_device_add:
- platform_device_put(hp_wmi_platform_dev);
-err_device_alloc:
- platform_driver_unregister(&hp_wmi_driver);
-err_driver_reg:
+err_unregister_device:
+ platform_device_unregister(hp_wmi_platform_dev);
+err_destroy_input:
if (event_capable)
hp_wmi_input_destroy();
return err;
}
+module_init(hp_wmi_init);
static void __exit hp_wmi_exit(void)
{
@@ -972,6 +965,4 @@ static void __exit hp_wmi_exit(void)
platform_driver_unregister(&hp_wmi_driver);
}
}
-
-module_init(hp_wmi_init);
module_exit(hp_wmi_exit);