3 files changed, 20 insertions, 17 deletions

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..841be4ee2109 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);
 }
 
 /*
@@ -842,7 +843,7 @@ static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
                         ACPI_WARNING((AE_INFO,
                                 "Invalid throttling state, reset"));
                         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/include/acpi/processor.h b/include/acpi/processor.h
index baf1e0a9a7ee..740ac3ad8fd0 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -174,7 +174,7 @@ struct acpi_processor_throttling {
         cpumask_var_t shared_cpu_map;
         int (*acpi_processor_get_throttling) (struct acpi_processor * pr);
         int (*acpi_processor_set_throttling) (struct acpi_processor * pr,
-                                              int state);
+                                              int state, bool force);
 
         u32 address;
         u8 duty_offset;
@@ -321,7 +321,8 @@ static inline int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
 /* in processor_throttling.c */
 int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
 int acpi_processor_get_throttling_info(struct acpi_processor *pr);
-extern int acpi_processor_set_throttling(struct acpi_processor *pr, int state);
+extern int acpi_processor_set_throttling(struct acpi_processor *pr,
+                                         int state, bool force);
 extern const struct file_operations acpi_processor_throttling_fops;
 extern void acpi_processor_throttling_init(void);
 /* in processor_idle.c */