6 files changed, 50 insertions, 26 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index a858bc528ec3..b83389145f28 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -117,6 +117,7 @@ config ACPI_BUTTON
 config ACPI_VIDEO
         tristate "Video"
         depends on X86 && BACKLIGHT_CLASS_DEVICE && VIDEO_OUTPUT_CONTROL
+        depends on INPUT
         help
           This driver implement the ACPI Extensions For Display Adapters
           for integrated graphics devices on motherboard, as specified in
diff --git a/drivers/acpi/hardware/hwsleep.c b/drivers/acpi/hardware/hwsleep.c
index cf69c0040a39..8181afbd1d4d 100644
--- a/drivers/acpi/hardware/hwsleep.c
+++ b/drivers/acpi/hardware/hwsleep.c
@@ -234,15 +234,11 @@ acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
                                 "While executing method _SST"));
         }
 
-        /*
-         * 1) Disable/Clear all GPEs
-         */
+        /* Disable/Clear all GPEs */
+
         status = acpi_hw_disable_all_gpes();
-        if (ACPI_FAILURE(status)) {
-                return_ACPI_STATUS(status);
-        }
 
-        return_ACPI_STATUS(AE_OK);
+        return_ACPI_STATUS(status);
 }
 
 ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_prep)
diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c
index 2cbb9aabd00e..caf8721ae6fb 100644
--- a/drivers/acpi/sleep/main.c
+++ b/drivers/acpi/sleep/main.c
@@ -256,6 +256,11 @@ static int acpi_hibernation_enter(void)
 
 static void acpi_hibernation_finish(void)
 {
+        /*
+         * If ACPI is not enabled by the BIOS and the boot kernel, we need to
+         * enable it here.
+         */
+        acpi_enable();
         acpi_leave_sleep_state(ACPI_STATE_S4);
         acpi_disable_wakeup_device(ACPI_STATE_S4);
 
diff --git a/drivers/acpi/tables/tbutils.c b/drivers/acpi/tables/tbutils.c
index 8cc9492ffbf2..5f1d85f2ffe4 100644
--- a/drivers/acpi/tables/tbutils.c
+++ b/drivers/acpi/tables/tbutils.c
@@ -400,7 +400,7 @@ acpi_tb_parse_root_table(acpi_physical_address rsdp_address, u8 flags)
         u32 table_count;
         struct acpi_table_header *table;
         acpi_physical_address address;
-        acpi_physical_address rsdt_address;
+        acpi_physical_address uninitialized_var(rsdt_address);
         u32 length;
         u8 *table_entry;
         acpi_status status;
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index bc6d5866ef98..69ec73b0239d 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -195,6 +195,7 @@ struct acpi_thermal {
         struct acpi_thermal_trips trips;
         struct acpi_handle_list devices;
         struct timer_list timer;
+        struct mutex lock;
 };
 
 static const struct file_operations acpi_thermal_state_fops = {
@@ -711,6 +712,7 @@ static void acpi_thermal_check(void *data)
         int result = 0;
         struct acpi_thermal *tz = data;
         unsigned long sleep_time = 0;
+        unsigned long timeout_jiffies = 0;
         int i = 0;
         struct acpi_thermal_state state;
 
@@ -720,11 +722,15 @@ static void acpi_thermal_check(void *data)
                 return;
         }
 
+        /* Check if someone else is already running */
+        if (!mutex_trylock(&tz->lock))
+                return;
+
         state = tz->state;
 
         result = acpi_thermal_get_temperature(tz);
         if (result)
-                return;
+                goto unlock;
 
         memset(&tz->state, 0, sizeof(tz->state));
 
@@ -787,10 +793,13 @@ static void acpi_thermal_check(void *data)
          * a thermal event occurs).  Note that _TSP and _TZD values are
          * given in 1/10th seconds (we must covert to milliseconds).
          */
-        if (tz->state.passive)
+        if (tz->state.passive) {
                 sleep_time = tz->trips.passive.tsp * 100;
-        else if (tz->polling_frequency > 0)
+                timeout_jiffies =  jiffies + (HZ * sleep_time) / 1000;
+        } else if (tz->polling_frequency > 0) {
                 sleep_time = tz->polling_frequency * 100;
+                timeout_jiffies =  round_jiffies(jiffies + (HZ * sleep_time) / 1000);
+        }
 
         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
                           tz->name, tz->temperature, sleep_time));
@@ -804,17 +813,16 @@ static void acpi_thermal_check(void *data)
                         del_timer(&(tz->timer));
         } else {
                 if (timer_pending(&(tz->timer)))
-                        mod_timer(&(tz->timer),
-                                        jiffies + (HZ * sleep_time) / 1000);
+                        mod_timer(&(tz->timer), timeout_jiffies);
                 else {
                         tz->timer.data = (unsigned long)tz;
                         tz->timer.function = acpi_thermal_run;
-                        tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
+                        tz->timer.expires = timeout_jiffies;
                         add_timer(&(tz->timer));
                 }
         }
-
-        return;
+      unlock:
+        mutex_unlock(&tz->lock);
 }
 
 /* --------------------------------------------------------------------------
@@ -1251,7 +1259,7 @@ static int acpi_thermal_add(struct acpi_device *device)
         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
         acpi_driver_data(device) = tz;
-
+        mutex_init(&tz->lock);
         result = acpi_thermal_get_info(tz);
         if (result)
                 goto end;
@@ -1321,7 +1329,7 @@ static int acpi_thermal_remove(struct acpi_device *device, int type)
         }
 
         acpi_thermal_remove_fs(device);
-
+        mutex_destroy(&tz->lock);
         kfree(tz);
         return 0;
 }
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index d05891f16282..f31e3c8749e0 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -409,14 +409,17 @@ acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 static int
 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 {
-        int status;
+        int status = AE_OK;
         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
         struct acpi_object_list args = { 1, &arg0 };
 
 
         arg0.integer.value = level;
-        status = acpi_evaluate_object(device->dev->handle, "_BCM", &args, NULL);
 
+        if (device->cap._BCM)
+                status = acpi_evaluate_object(device->dev->handle, "_BCM",
+                                              &args, NULL);
+        device->brightness->curr = level;
         return status;
 }
 
@@ -424,11 +427,11 @@ static int
 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
                                         unsigned long *level)
 {
-        int status;
-
-        status = acpi_evaluate_integer(device->dev->handle, "_BQC", NULL, level);
-
-        return status;
+        if (device->cap._BQC)
+                return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
+                                             level);
+        *level = device->brightness->curr;
+        return AE_OK;
 }
 
 static int
@@ -1633,9 +1636,20 @@ static int
 acpi_video_get_next_level(struct acpi_video_device *device,
                           u32 level_current, u32 event)
 {
-        int min, max, min_above, max_below, i, l;
+        int min, max, min_above, max_below, i, l, delta = 255;
         max = max_below = 0;
         min = min_above = 255;
+        /* Find closest level to level_current */
+        for (i = 0; i < device->brightness->count; i++) {
+                l = device->brightness->levels[i];
+                if (abs(l - level_current) < abs(delta)) {
+                        delta = l - level_current;
+                        if (!delta)
+                                break;
+                }
+        }
+        /* Ajust level_current to closest available level */
+        level_current += delta;
         for (i = 0; i < device->brightness->count; i++) {
                 l = device->brightness->levels[i];
                 if (l < min)