6 files changed, 46 insertions, 21 deletions

diff --git a/drivers/acpi/acpica/exstorob.c b/drivers/acpi/acpica/exstorob.c
index 67340cc70142..257706e7734f 100644
--- a/drivers/acpi/acpica/exstorob.c
+++ b/drivers/acpi/acpica/exstorob.c
@@ -70,6 +70,12 @@ acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc,
 
         ACPI_FUNCTION_TRACE_PTR(ex_store_buffer_to_buffer, source_desc);
 
+        /* If Source and Target are the same, just return */
+
+        if (source_desc == target_desc) {
+                return_ACPI_STATUS(AE_OK);
+        }
+
         /* We know that source_desc is a buffer by now */
 
         buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer);
@@ -161,6 +167,12 @@ acpi_ex_store_string_to_string(union acpi_operand_object *source_desc,
 
         ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, source_desc);
 
+        /* If Source and Target are the same, just return */
+
+        if (source_desc == target_desc) {
+                return_ACPI_STATUS(AE_OK);
+        }
+
         /* We know that source_desc is a string by now */
 
         buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer);
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 84e0f3c07442..2cc4b3033872 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -1151,6 +1151,9 @@ static int __init acpi_processor_init(void)
 {
         int result = 0;
 
+        if (acpi_disabled)
+                return 0;
+
         memset(&errata, 0, sizeof(errata));
 
 #ifdef CONFIG_SMP
@@ -1197,6 +1200,9 @@ out_proc:
 
 static void __exit acpi_processor_exit(void)
 {
+        if (acpi_disabled)
+                return;
+
         acpi_processor_ppc_exit();
 
         acpi_thermal_cpufreq_exit();
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 0efa59e7e3af..66393d5c4c7c 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -162,8 +162,9 @@ static void lapic_timer_check_state(int state, struct acpi_processor *pr,
                 pr->power.timer_broadcast_on_state = state;
 }
 
-static void lapic_timer_propagate_broadcast(struct acpi_processor *pr)
+static void lapic_timer_propagate_broadcast(void *arg)
 {
+        struct acpi_processor *pr = (struct acpi_processor *) arg;
         unsigned long reason;
 
         reason = pr->power.timer_broadcast_on_state < INT_MAX ?
@@ -635,7 +636,8 @@ static int acpi_processor_power_verify(struct acpi_processor *pr)
                 working++;
         }
 
-        lapic_timer_propagate_broadcast(pr);
+        smp_call_function_single(pr->id, lapic_timer_propagate_broadcast,
+                                 pr, 1);
 
         return (working);
 }
diff --git a/drivers/acpi/processor_thermal.c b/drivers/acpi/processor_thermal.c
index 39838c666032..31adda1099e0 100644
--- a/drivers/acpi/processor_thermal.c
+++ b/drivers/acpi/processor_thermal.c
@@ -66,7 +66,7 @@ static int acpi_processor_apply_limit(struct acpi_processor *pr)
                 if (pr->limit.thermal.tx > tx)
                         tx = pr->limit.thermal.tx;
 
-                result = acpi_processor_set_throttling(pr, tx);
+                result = acpi_processor_set_throttling(pr, tx, false);
                 if (result)
                         goto end;
         }
@@ -421,12 +421,12 @@ processor_set_cur_state(struct thermal_cooling_device *cdev,
 
         if (state <= max_pstate) {
                 if (pr->flags.throttling && pr->throttling.state)
-                        result = acpi_processor_set_throttling(pr, 0);
+                        result = acpi_processor_set_throttling(pr, 0, false);
                 cpufreq_set_cur_state(pr->id, state);
         } else {
                 cpufreq_set_cur_state(pr->id, max_pstate);
                 result = acpi_processor_set_throttling(pr,
-                                state - max_pstate);
+                                state - max_pstate, false);
         }
         return result;
 }
diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index 227543789ba9..ae39797aab55 100644
--- a/drivers/acpi/processor_throttling.c
+++ b/drivers/acpi/processor_throttling.c
@@ -62,7 +62,8 @@ struct throttling_tstate {
 #define THROTTLING_POSTCHANGE      (2)
 
 static int acpi_processor_get_throttling(struct acpi_processor *pr);
-int acpi_processor_set_throttling(struct acpi_processor *pr, int state);
+int acpi_processor_set_throttling(struct acpi_processor *pr,
+                                                int state, bool force);
 
 static int acpi_processor_update_tsd_coord(void)
 {
@@ -361,7 +362,7 @@ int acpi_processor_tstate_has_changed(struct acpi_processor *pr)
                  */
                 target_state = throttling_limit;
         }
-        return acpi_processor_set_throttling(pr, target_state);
+        return acpi_processor_set_throttling(pr, target_state, false);
 }
 
 /*
@@ -839,10 +840,10 @@ static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
         if (ret >= 0) {
                 state = acpi_get_throttling_state(pr, value);
                 if (state == -1) {
-                        ACPI_WARNING((AE_INFO,
-                                "Invalid throttling state, reset"));
+                        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                "Invalid throttling state, reset\n"));
                         state = 0;
-                        ret = acpi_processor_set_throttling(pr, state);
+                        ret = acpi_processor_set_throttling(pr, state, true);
                         if (ret)
                                 return ret;
                 }
@@ -915,7 +916,7 @@ static int acpi_processor_get_fadt_info(struct acpi_processor *pr)
 }
 
 static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
-                                              int state)
+                                              int state, bool force)
 {
         u32 value = 0;
         u32 duty_mask = 0;
@@ -930,7 +931,7 @@ static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
         if (!pr->flags.throttling)
                 return -ENODEV;
 
-        if (state == pr->throttling.state)
+        if (!force && (state == pr->throttling.state))
                 return 0;
 
         if (state < pr->throttling_platform_limit)
@@ -988,7 +989,7 @@ static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
 }
 
 static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
-                                             int state)
+                                             int state, bool force)
 {
         int ret;
         acpi_integer value;
@@ -1002,7 +1003,7 @@ static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
         if (!pr->flags.throttling)
                 return -ENODEV;
 
-        if (state == pr->throttling.state)
+        if (!force && (state == pr->throttling.state))
                 return 0;
 
         if (state < pr->throttling_platform_limit)
@@ -1018,7 +1019,8 @@ static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
         return 0;
 }
 
-int acpi_processor_set_throttling(struct acpi_processor *pr, int state)
+int acpi_processor_set_throttling(struct acpi_processor *pr,
+                                                int state, bool force)
 {
         cpumask_var_t saved_mask;
         int ret = 0;
@@ -1070,7 +1072,7 @@ int acpi_processor_set_throttling(struct acpi_processor *pr, int state)
                 /* FIXME: use work_on_cpu() */
                 set_cpus_allowed_ptr(current, cpumask_of(pr->id));
                 ret = p_throttling->acpi_processor_set_throttling(pr,
-                                                t_state.target_state);
+                                                t_state.target_state, force);
         } else {
                 /*
                  * When the T-state coordination is SW_ALL or HW_ALL,
@@ -1103,7 +1105,7 @@ int acpi_processor_set_throttling(struct acpi_processor *pr, int state)
                         set_cpus_allowed_ptr(current, cpumask_of(i));
                         ret = match_pr->throttling.
                                 acpi_processor_set_throttling(
-                                match_pr, t_state.target_state);
+                                match_pr, t_state.target_state, force);
                 }
         }
         /*
@@ -1201,7 +1203,7 @@ int acpi_processor_get_throttling_info(struct acpi_processor *pr)
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                   "Disabling throttling (was T%d)\n",
                                   pr->throttling.state));
-                result = acpi_processor_set_throttling(pr, 0);
+                result = acpi_processor_set_throttling(pr, 0, false);
                 if (result)
                         goto end;
         }
@@ -1307,7 +1309,7 @@ static ssize_t acpi_processor_write_throttling(struct file *file,
         if (strcmp(tmpbuf, charp) != 0)
                 return -EINVAL;
 
-        result = acpi_processor_set_throttling(pr, state_val);
+        result = acpi_processor_set_throttling(pr, state_val, false);
         if (result)
                 return result;
 
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 8851315ce858..60ea984c84a0 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -2004,8 +2004,11 @@ static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
         status = acpi_remove_notify_handler(device->dev->handle,
                                             ACPI_DEVICE_NOTIFY,
                                             acpi_video_device_notify);
-        sysfs_remove_link(&device->backlight->dev.kobj, "device");
-        backlight_device_unregister(device->backlight);
+        if (device->backlight) {
+                sysfs_remove_link(&device->backlight->dev.kobj, "device");
+                backlight_device_unregister(device->backlight);
+                device->backlight = NULL;
+        }
         if (device->cdev) {
                 sysfs_remove_link(&device->dev->dev.kobj,
                                   "thermal_cooling");