Merge branch 'acpi-assorted'

* acpi-assorted: (21 commits)
  ACPI / thermal: do not always return THERMAL_TREND_RAISING for active trip points
  ACPI: video: correct acpi_video_bus_add error processing
  ACPI: Fix wrong parameter passed to memblock_reserve
  acpi: video: enhance the quirk detect logic of _BQC
  ACPI: update comments for acpi_event_status
  ACPI: remove "config ACPI_DEBUG_FUNC_TRACE"
  PCI / ACPI: Don't query OSC support with all possible controls
  ACPI / processor_thermal: avoid null pointer deference error
  ACPI / fan: avoid null pointer deference error
  ACPI / video: Fix applying indexed initial brightness value.
  ACPI / video: Make logic a little easier to understand.
  ACPI / video: Fix brightness control initialization for some laptops.
  ACPI: Use resource_size() in osl.c
  ACPI / acpi_pad: Used PTR_RET
  ACPI: suppress compiler warning in container.c
  ACPI: suppress compiler warning in battery.c
  ACPI: suppress compiler warnings in processor_throttling.c
  ACPI: suppress compiler warnings in button.c
  ACPI: replace kmalloc+memcpy with kmemdup
  ACPI: Remove acpi_pci_bind_root() definition
  ...

13 files changed, 243 insertions, 154 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 8fcae6df0a4..100bd724f64 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -298,14 +298,6 @@ config ACPI_DEBUG
 	  Documentation/kernel-parameters.txt to control the type and
 	  amount of debug output.
 
-config ACPI_DEBUG_FUNC_TRACE
-	bool "Additionally enable ACPI function tracing"
-	default n
-	depends on ACPI_DEBUG
-	help
-	  ACPI Debug Statements slow down ACPI processing. Function trace
-	  is about half of the penalty and is rarely useful.
-
 config ACPI_PCI_SLOT
 	bool "PCI slot detection driver"
 	depends on SYSFS
diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index 31de1043eea..27bb6a91de5 100644
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -236,7 +236,7 @@ static int create_power_saving_task(void)
 	ps_tsks[ps_tsk_num] = kthread_run(power_saving_thread,
 		(void *)(unsigned long)ps_tsk_num,
 		"acpi_pad/%d", ps_tsk_num);
-	rc = IS_ERR(ps_tsks[ps_tsk_num]) ? PTR_ERR(ps_tsks[ps_tsk_num]) : 0;
+	rc = PTR_RET(ps_tsks[ps_tsk_num]);
 	if (!rc)
 		ps_tsk_num++;
 	else
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index c5cd5b5513e..0cc384b7294 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -146,7 +146,7 @@ struct acpi_battery {
 
 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat)
 
-inline int acpi_battery_present(struct acpi_battery *battery)
+static inline int acpi_battery_present(struct acpi_battery *battery)
 {
 	return battery->device->status.battery_present;
 }
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 01708a16536..292de3cab9c 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -288,13 +288,12 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 	}
 out_success:
 	context->ret.length = out_obj->buffer.length;
-	context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
+	context->ret.pointer = kmemdup(out_obj->buffer.pointer,
+				       context->ret.length, GFP_KERNEL);
 	if (!context->ret.pointer) {
 		status =  AE_NO_MEMORY;
 		goto out_kfree;
 	}
-	memcpy(context->ret.pointer, out_obj->buffer.pointer,
-		context->ret.length);
 	status =  AE_OK;
 
 out_kfree:
diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 86c7d5445c3..92a659aa639 100644
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -33,6 +33,7 @@
 #include <linux/slab.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
+#include <acpi/button.h>
 
 #define PREFIX "ACPI: "
 
diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
index f9f8a08827f..e2315166765 100644
--- a/drivers/acpi/container.c
+++ b/drivers/acpi/container.c
@@ -30,6 +30,8 @@
 
 #include "internal.h"
 
+#include "internal.h"
+
 #define PREFIX "ACPI: "
 
 #define _COMPONENT			ACPI_CONTAINER_COMPONENT
diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c
index f815da82c76..8d1c0105e11 100644
--- a/drivers/acpi/fan.c
+++ b/drivers/acpi/fan.c
@@ -174,9 +174,13 @@ static int acpi_fan_add(struct acpi_device *device)
 
 static int acpi_fan_remove(struct acpi_device *device)
 {
-	struct thermal_cooling_device *cdev = acpi_driver_data(device);
+	struct thermal_cooling_device *cdev;
+
+	if (!device)
+		return -EINVAL;
 
-	if (!device || !cdev)
+	cdev =  acpi_driver_data(device);
+	if (!cdev)
 		return -EINVAL;
 
 	sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 586e7e993d3..e72186340fe 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -641,7 +641,7 @@ void __init acpi_initrd_override(void *data, size_t size)
 	 * Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
 	 * works fine.
 	 */
-	memblock_reserve(acpi_tables_addr, acpi_tables_addr + all_tables_size);
+	memblock_reserve(acpi_tables_addr, all_tables_size);
 	arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
 
 	p = early_ioremap(acpi_tables_addr, all_tables_size);
@@ -1555,7 +1555,7 @@ int acpi_check_resource_conflict(const struct resource *res)
 	else
 		space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
 
-	length = res->end - res->start + 1;
+	length = resource_size(res);
 	if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
 		warn = 1;
 	clash = acpi_check_address_range(space_id, res->start, length, warn);
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 6ae5e440436..4241b8d844e 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -201,8 +201,8 @@ static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
 		*control &= OSC_PCI_CONTROL_MASKS;
 		capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set;
 	} else {
-		/* Run _OSC query for all possible controls. */
-		capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS;
+		/* Run _OSC query only with existing controls. */
+		capbuf[OSC_CONTROL_TYPE] = root->osc_control_set;
 	}
 
 	status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
diff --git a/drivers/acpi/processor_thermal.c b/drivers/acpi/processor_thermal.c
index 641b5450a0d..e8e652710e6 100644
--- a/drivers/acpi/processor_thermal.c
+++ b/drivers/acpi/processor_thermal.c
@@ -218,9 +218,13 @@ processor_get_max_state(struct thermal_cooling_device *cdev,
 			unsigned long *state)
 {
 	struct acpi_device *device = cdev->devdata;
-	struct acpi_processor *pr = acpi_driver_data(device);
+	struct acpi_processor *pr;
 
-	if (!device || !pr)
+	if (!device)
+		return -EINVAL;
+
+	pr = acpi_driver_data(device);
+	if (!pr)
 		return -EINVAL;
 
 	*state = acpi_processor_max_state(pr);
@@ -232,9 +236,13 @@ processor_get_cur_state(struct thermal_cooling_device *cdev,
 			unsigned long *cur_state)
 {
 	struct acpi_device *device = cdev->devdata;
-	struct acpi_processor *pr = acpi_driver_data(device);
+	struct acpi_processor *pr;
 
-	if (!device || !pr)
+	if (!device)
+		return -EINVAL;
+
+	pr = acpi_driver_data(device);
+	if (!pr)
 		return -EINVAL;
 
 	*cur_state = cpufreq_get_cur_state(pr->id);
@@ -248,11 +256,15 @@ processor_set_cur_state(struct thermal_cooling_device *cdev,
 			unsigned long state)
 {
 	struct acpi_device *device = cdev->devdata;
-	struct acpi_processor *pr = acpi_driver_data(device);
+	struct acpi_processor *pr;
 	int result = 0;
 	int max_pstate;
 
-	if (!device || !pr)
+	if (!device)
+		return -EINVAL;
+
+	pr = acpi_driver_data(device);
+	if (!pr)
 		return -EINVAL;
 
 	max_pstate = cpufreq_get_max_state(pr->id);
diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index 1d02b7b5ade..e7dd2c1fee7 100644
--- a/drivers/acpi/processor_throttling.c
+++ b/drivers/acpi/processor_throttling.c
@@ -211,9 +211,10 @@ err_ret:
  */
 void acpi_processor_throttling_init(void)
 {
-	if (acpi_processor_update_tsd_coord())
+	if (acpi_processor_update_tsd_coord()) {
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 			"Assume no T-state coordination\n"));
+	}
 
 	return;
 }
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 8470771e5ea..a33821ca389 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -723,9 +723,19 @@ static int thermal_get_trend(struct thermal_zone_device *thermal,
 		return -EINVAL;
 
 	if (type == THERMAL_TRIP_ACTIVE) {
-		/* aggressive active cooling */
-		*trend = THERMAL_TREND_RAISING;
-		return 0;
+		unsigned long trip_temp;
+		unsigned long temp = KELVIN_TO_MILLICELSIUS(tz->temperature,
+							tz->kelvin_offset);
+		if (thermal_get_trip_temp(thermal, trip, &trip_temp))
+			return -EINVAL;
+
+		if (temp > trip_temp) {
+			*trend = THERMAL_TREND_RAISING;
+			return 0;
+		} else {
+			/* Fall back on default trend */
+			return -EINVAL;
+		}
 	}
 
 	/*
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 313f959413d..c3932d0876e 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -167,7 +167,8 @@ struct acpi_video_device_flags {
 	u8 dvi:1;
 	u8 bios:1;
 	u8 unknown:1;
-	u8 reserved:2;
+	u8 notify:1;
+	u8 reserved:1;
 };
 
 struct acpi_video_device_cap {
@@ -222,7 +223,7 @@ static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 			int level);
 static int acpi_video_device_lcd_get_level_current(
 			struct acpi_video_device *device,
-			unsigned long long *level, int init);
+			unsigned long long *level, bool raw);
 static int acpi_video_get_next_level(struct acpi_video_device *device,
 				     u32 level_current, u32 event);
 static int acpi_video_switch_brightness(struct acpi_video_device *device,
@@ -236,7 +237,7 @@ static int acpi_video_get_brightness(struct backlight_device *bd)
 	struct acpi_video_device *vd =
 		(struct acpi_video_device *)bl_get_data(bd);
 
-	if (acpi_video_device_lcd_get_level_current(vd, &cur_level, 0))
+	if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
 		return -EINVAL;
 	for (i = 2; i < vd->brightness->count; i++) {
 		if (vd->brightness->levels[i] == cur_level)
@@ -281,7 +282,7 @@ static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsig
 	unsigned long long level;
 	int offset;
 
-	if (acpi_video_device_lcd_get_level_current(video, &level, 0))
+	if (acpi_video_device_lcd_get_level_current(video, &level, false))
 		return -EINVAL;
 	for (offset = 2; offset < video->brightness->count; offset++)
 		if (level == video->brightness->levels[offset]) {
@@ -447,12 +448,45 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
 		DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
 		},
 	},
+	{
+	 .callback = video_ignore_initial_backlight,
+	 .ident = "HP Pavilion dm4",
+	 .matches = {
+		DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
+		},
+	},
 	{}
 };
 
+static unsigned long long
+acpi_video_bqc_value_to_level(struct acpi_video_device *device,
+			      unsigned long long bqc_value)
+{
+	unsigned long long level;
+
+	if (device->brightness->flags._BQC_use_index) {
+		/*
+		 * _BQC returns an index that doesn't account for
+		 * the first 2 items with special meaning, so we need
+		 * to compensate for that by offsetting ourselves
+		 */
+		if (device->brightness->flags._BCL_reversed)
+			bqc_value = device->brightness->count - 3 - bqc_value;
+
+		level = device->brightness->levels[bqc_value + 2];
+	} else {
+		level = bqc_value;
+	}
+
+	level += bqc_offset_aml_bug_workaround;
+
+	return level;
+}
+
 static int
 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
-					unsigned long long *level, int init)
+					unsigned long long *level, bool raw)
 {
 	acpi_status status = AE_OK;
 	int i;
@@ -463,29 +497,30 @@ acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 		status = acpi_evaluate_integer(device->dev->handle, buf,
 						NULL, level);
 		if (ACPI_SUCCESS(status)) {
-			if (device->brightness->flags._BQC_use_index) {
-				if (device->brightness->flags._BCL_reversed)
-					*level = device->brightness->count
-								 - 3 - (*level);
-				*level = device->brightness->levels[*level + 2];
-
+			if (raw) {
+				/*
+				 * Caller has indicated he wants the raw
+				 * value returned by _BQC, so don't furtherly
+				 * mess with the value.
+				 */
+				return 0;
 			}
-			*level += bqc_offset_aml_bug_workaround;
+
+			*level = acpi_video_bqc_value_to_level(device, *level);
+
 			for (i = 2; i < device->brightness->count; i++)
 				if (device->brightness->levels[i] == *level) {
 					device->brightness->curr = *level;
 					return 0;
 			}
-			if (!init) {
-				/*
-				 * BQC returned an invalid level.
-				 * Stop using it.
-				 */
-				ACPI_WARNING((AE_INFO,
-					      "%s returned an invalid level",
-					      buf));
-				device->cap._BQC = device->cap._BCQ = 0;
-			}
+			/*
+			 * BQC returned an invalid level.
+			 * Stop using it.
+			 */
+			ACPI_WARNING((AE_INFO,
+				      "%s returned an invalid level",
+				      buf));
+			device->cap._BQC = device->cap._BCQ = 0;
 		} else {
 			/* Fixme:
 			 * should we return an error or ignore this failure?
@@ -598,6 +633,56 @@ acpi_video_cmp_level(const void *a, const void *b)
 }
 
 /*
+ * Decides if _BQC/_BCQ for this system is usable
+ *
+ * We do this by changing the level first and then read out the current
+ * brightness level, if the value does not match, find out if it is using
+ * index. If not, clear the _BQC/_BCQ capability.
+ */
+static int acpi_video_bqc_quirk(struct acpi_video_device *device,
+				int max_level, int current_level)
+{
+	struct acpi_video_device_brightness *br = device->brightness;
+	int result;
+	unsigned long long level;
+	int test_level;
+
+	/* don't mess with existing known broken systems */
+	if (bqc_offset_aml_bug_workaround)
+		return 0;
+
+	/*
+	 * Some systems always report current brightness level as maximum
+	 * through _BQC, we need to test another value for them.
+	 */
+	test_level = current_level == max_level ? br->levels[2] : max_level;
+
+	result = acpi_video_device_lcd_set_level(device, test_level);
+	if (result)
+		return result;
+
+	result = acpi_video_device_lcd_get_level_current(device, &level, true);
+	if (result)
+		return result;
+
+	if (level != test_level) {
+		/* buggy _BQC found, need to find out if it uses index */
+		if (level < br->count) {
+			if (br->flags._BCL_reversed)
+				level = br->count - 3 - level;
+			if (br->levels[level + 2] == test_level)
+				br->flags._BQC_use_index = 1;
+		}
+
+		if (!br->flags._BQC_use_index)
+			device->cap._BQC = device->cap._BCQ = 0;
+	}
+
+	return 0;
+}
+
+
+/*
  *  Arg:	
  *  	device	: video output device (LCD, CRT, ..)
  *
@@ -703,42 +788,36 @@ acpi_video_init_brightness(struct acpi_video_device *device)
 	if (!device->cap._BQC)
 		goto set_level;
 
-	result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
-	if (result)
-		goto out_free_levels;
-
-	/*
-	 * Set the level to maximum and check if _BQC uses indexed value
-	 */
-	result = acpi_video_device_lcd_set_level(device, max_level);
+	result = acpi_video_device_lcd_get_level_current(device,
+							 &level_old, true);
 	if (result)
 		goto out_free_levels;
 
-	result = acpi_video_device_lcd_get_level_current(device, &level, 0);
+	result = acpi_video_bqc_quirk(device, max_level, level_old);
 	if (result)
 		goto out_free_levels;
+	/*
+	 * cap._BQC may get cleared due to _BQC is found to be broken
+	 * in acpi_video_bqc_quirk, so check again here.
+	 */
+	if (!device->cap._BQC)
+		goto set_level;
 
-	br->flags._BQC_use_index = (level == max_level ? 0 : 1);
-
-	if (!br->flags._BQC_use_index) {
+	if (use_bios_initial_backlight) {
+		level = acpi_video_bqc_value_to_level(device, level_old);
 		/*
-		 * Set the backlight to the initial state.
-		 * On some buggy laptops, _BQC returns an uninitialized value
-		 * when invoked for the first time, i.e. level_old is invalid.
-		 * set the backlight to max_level in this case
+		 * On some buggy laptops, _BQC returns an uninitialized
+		 * value when invoked for the first time, i.e.
+		 * level_old is invalid (no matter whether it's a level
+		 * or an index). Set the backlight to max_level in this case.
 		 */
-		if (use_bios_initial_backlight) {
-			for (i = 2; i < br->count; i++)
-				if (level_old == br->levels[i])
-					level = level_old;
-		}
-		goto set_level;
+		for (i = 2; i < br->count; i++)
+			if (level_old == br->levels[i])
+				break;
+		if (i == br->count)
+			level = max_level;
 	}
 
-	if (br->flags._BCL_reversed)
-		level_old = (br->count - 1) - level_old;
-	level = br->levels[level_old];
-
 set_level:
 	result = acpi_video_device_lcd_set_level(device, level);
 	if (result)
@@ -996,53 +1075,51 @@ acpi_video_bus_get_one_device(struct acpi_device *device,
 	struct acpi_video_device *data;
 	struct acpi_video_device_attrib* attribute;
 
-	if (!device || !video)
-		return -EINVAL;
-
 	status =
 	    acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
-	if (ACPI_SUCCESS(status)) {
-
-		data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
-		if (!data)
-			return -ENOMEM;
-
-		strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
-		strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
-		device->driver_data = data;
-
-		data->device_id = device_id;
-		data->video = video;
-		data->dev = device;
+	/* Some device omits _ADR, we skip them instead of fail */
+	if (ACPI_FAILURE(status))
+		return 0;
 
-		attribute = acpi_video_get_device_attr(video, device_id);
+	data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
 
-		if((attribute != NULL) && attribute->device_id_scheme) {
-			switch (attribute->display_type) {
-			case ACPI_VIDEO_DISPLAY_CRT:
-				data->flags.crt = 1;
-				break;
-			case ACPI_VIDEO_DISPLAY_TV:
-				data->flags.tvout = 1;
-				break;
-			case ACPI_VIDEO_DISPLAY_DVI:
-				data->flags.dvi = 1;
-				break;
-			case ACPI_VIDEO_DISPLAY_LCD:
-				data->flags.lcd = 1;
-				break;
-			default:
-				data->flags.unknown = 1;
-				break;
-			}
-			if(attribute->bios_can_detect)
-				data->flags.bios = 1;
-		} else {
-			/* Check for legacy IDs */
-			device_type = acpi_video_get_device_type(video,
-								 device_id);
-			/* Ignore bits 16 and 18-20 */
-			switch (device_type & 0xffe2ffff) {
+	strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
+	strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
+	device->driver_data = data;
+
+	data->device_id = device_id;
+	data->video = video;
+	data->dev = device;
+
+	attribute = acpi_video_get_device_attr(video, device_id);
+
+	if((attribute != NULL) && attribute->device_id_scheme) {
+		switch (attribute->display_type) {
+		case ACPI_VIDEO_DISPLAY_CRT:
+			data->flags.crt = 1;
+			break;
+		case ACPI_VIDEO_DISPLAY_TV:
+			data->flags.tvout = 1;
+			break;
+		case ACPI_VIDEO_DISPLAY_DVI:
+			data->flags.dvi = 1;
+			break;
+		case ACPI_VIDEO_DISPLAY_LCD:
+			data->flags.lcd = 1;
+			break;
+		default:
+			data->flags.unknown = 1;
+			break;
+		}
+		if(attribute->bios_can_detect)
+			data->flags.bios = 1;
+	} else {
+		/* Check for legacy IDs */
+		device_type = acpi_video_get_device_type(video, device_id);
+		/* Ignore bits 16 and 18-20 */
+		switch (device_type & 0xffe2ffff) {
 			case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
 				data->flags.crt = 1;
 				break;
@@ -1054,34 +1131,24 @@ acpi_video_bus_get_one_device(struct acpi_device *device,
 				break;
 			default:
 				data->flags.unknown = 1;
-			}
 		}
+	}
 
-		acpi_video_device_bind(video, data);
-		acpi_video_device_find_cap(data);
-
-		status = acpi_install_notify_handler(device->handle,
-						     ACPI_DEVICE_NOTIFY,
-						     acpi_video_device_notify,
-						     data);
-		if (ACPI_FAILURE(status)) {
-			printk(KERN_ERR PREFIX
-					  "Error installing notify handler\n");
-			if(data->brightness)
-				kfree(data->brightness->levels);
-			kfree(data->brightness);
-			kfree(data);
-			return -ENODEV;
-		}
+	acpi_video_device_bind(video, data);
+	acpi_video_device_find_cap(data);
 
-		mutex_lock(&video->device_list_lock);
-		list_add_tail(&data->entry, &video->video_device_list);
-		mutex_unlock(&video->device_list_lock);
+	status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
+					     acpi_video_device_notify, data);
+	if (ACPI_FAILURE(status))
+		dev_err(&device->dev, "Error installing notify handler\n");
+	else
+		data->flags.notify = 1;
 
-		return 0;
-	}
+	mutex_lock(&video->device_list_lock);
+	list_add_tail(&data->entry, &video->video_device_list);
+	mutex_unlock(&video->device_list_lock);
 
-	return -ENOENT;
+	return status;
 }
 
 /*
@@ -1268,7 +1335,8 @@ acpi_video_switch_brightness(struct acpi_video_device *device, int event)
 		goto out;
 
 	result = acpi_video_device_lcd_get_level_current(device,
-							 &level_current, 0);
+							 &level_current,
+							 false);
 	if (result)
 		goto out;
 
@@ -1373,9 +1441,8 @@ acpi_video_bus_get_devices(struct acpi_video_bus *video,
 
 		status = acpi_video_bus_get_one_device(dev, video);
 		if (status) {
-			printk(KERN_WARNING PREFIX
-					"Can't attach device\n");
-			continue;
+			dev_err(&dev->dev, "Can't attach device\n");
+			break;
 		}
 	}
 	return status;
@@ -1388,13 +1455,14 @@ static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
 	if (!device || !device->video)
 		return -ENOENT;
 
-	status = acpi_remove_notify_handler(device->dev->handle,
-					    ACPI_DEVICE_NOTIFY,
-					    acpi_video_device_notify);
-	if (ACPI_FAILURE(status)) {
-		printk(KERN_WARNING PREFIX
-		       "Can't remove video notify handler\n");
+	if (device->flags.notify) {
+		status = acpi_remove_notify_handler(device->dev->handle,
+				ACPI_DEVICE_NOTIFY, acpi_video_device_notify);
+		if (ACPI_FAILURE(status))
+			dev_err(&device->dev->dev,
+					"Can't remove video notify handler\n");
 	}
+
 	if (device->backlight) {
 		backlight_device_unregister(device->backlight);
 		device->backlight = NULL;
@@ -1676,7 +1744,7 @@ static int acpi_video_bus_add(struct acpi_device *device)
 
 	error = acpi_video_bus_get_devices(video, device);
 	if (error)
-		goto err_free_video;
+		goto err_put_video;
 
 	video->input = input = input_allocate_device();
 	if (!input) {