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hp_accel: do not call ACPI from invalid context 

The LED on HP notebooks is connected through ACPI.  That unfortunately
means that it needs to be delayed by using schedule_work() to avoid
calling the ACPI interpreter from an invalid context.

[akpm@linux-foundation.org: use flush_work() rather than sort-of reimplementing it]
Signed-off-by: Pavel Machek <pavel@suse.cz>
Cc: Éric Piel <eric.piel@tremplin-utc.net>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Pavel Machek 2009-01-15 13:51:24 -08:00 committed by Linus Torvalds
parent 219beb291b
commit 9e1c9d8655
1 changed files with 49 additions and 19 deletions
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68
drivers/hwmon/hp_accel.c
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@ -3,7 +3,7 @@
*
* Copyright (C) 2007-2008 Yan Burman
* Copyright (C) 2008 Eric Piel
* Copyright (C) 2008 Pavel Machek
* Copyright (C) 2008-2009 Pavel Machek
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -44,6 +44,36 @@
#define DRIVER_NAME "lis3lv02d"
#define ACPI_MDPS_CLASS "accelerometer"
/* Delayed LEDs infrastructure ------------------------------------ */
/* Special LED class that can defer work */
struct delayed_led_classdev {
struct led_classdev led_classdev;
struct work_struct work;
enum led_brightness new_brightness;
unsigned int led; /* For driver */
void (*set_brightness)(struct delayed_led_classdev *data, enum led_brightness value);
};
static inline void delayed_set_status_worker(struct work_struct *work)
{
struct delayed_led_classdev *data =
container_of(work, struct delayed_led_classdev, work);
data->set_brightness(data, data->new_brightness);
}
static inline void delayed_sysfs_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
struct delayed_led_classdev *data = container_of(led_cdev,
struct delayed_led_classdev, led_classdev);
data->new_brightness = brightness;
schedule_work(&data->work);
}
/* HP-specific accelerometer driver ------------------------------------ */
/* For automatic insertion of the module */
static struct acpi_device_id lis3lv02d_device_ids[] = {
@ -155,28 +185,27 @@ static struct dmi_system_id lis3lv02d_dmi_ids[] = {
*/
};
static acpi_status hpled_acpi_write(acpi_handle handle, int reg)
static void hpled_set(struct delayed_led_classdev *led_cdev, enum led_brightness value)
{
acpi_handle handle = adev.device->handle;
unsigned long long ret; /* Not used when writing */
union acpi_object in_obj[1];
struct acpi_object_list args = { 1, in_obj };
in_obj[0].type = ACPI_TYPE_INTEGER;
in_obj[0].integer.value = reg;
in_obj[0].integer.value = !!value;
return acpi_evaluate_integer(handle, "ALED", &args, &ret);
acpi_evaluate_integer(handle, "ALED", &args, &ret);
}
static void hpled_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
hpled_acpi_write(adev.device->handle, !!value);
}
static struct led_classdev hpled_led = {
.name = "hp:red:hddprotection",
.default_trigger = "none",
.brightness_set = hpled_set,
static struct delayed_led_classdev hpled_led = {
.led_classdev = {
.name = "hp::hddprotect",
.default_trigger = "none",
.brightness_set = delayed_sysfs_set,
.flags = LED_CORE_SUSPENDRESUME,
},
.set_brightness = hpled_set,
};
static int lis3lv02d_add(struct acpi_device *device)
@ -208,13 +237,15 @@ static int lis3lv02d_add(struct acpi_device *device)
adev.ac = lis3lv02d_axis_normal;
}
ret = led_classdev_register(NULL, &hpled_led);
INIT_WORK(&hpled_led.work, delayed_set_status_worker);
ret = led_classdev_register(NULL, &hpled_led.led_classdev);
if (ret)
return ret;
ret = lis3lv02d_init_device(&adev);
if (ret) {
led_classdev_unregister(&hpled_led);
flush_work(&hpled_led.work);
led_classdev_unregister(&hpled_led.led_classdev);
return ret;
}
@ -229,7 +260,8 @@ static int lis3lv02d_remove(struct acpi_device *device, int type)
lis3lv02d_joystick_disable();
lis3lv02d_poweroff(device->handle);
led_classdev_unregister(&hpled_led);
flush_work(&hpled_led.work);
led_classdev_unregister(&hpled_led.led_classdev);
return lis3lv02d_remove_fs();
}
@ -240,7 +272,6 @@ static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state)
{
/* make sure the device is off when we suspend */
lis3lv02d_poweroff(device->handle);
led_classdev_suspend(&hpled_led);
return 0;
}
@ -253,7 +284,6 @@ static int lis3lv02d_resume(struct acpi_device *device)
else
lis3lv02d_poweroff(device->handle);
mutex_unlock(&adev.lock);
led_classdev_resume(&hpled_led);
return 0;
}
#else