1 files changed, 27 insertions, 11 deletions

diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index 28509fbba6f9..a56fc6c4394b 100644
--- a/drivers/acpi/processor_throttling.c
+++ b/drivers/acpi/processor_throttling.c
@@ -71,7 +71,7 @@ static int acpi_processor_update_tsd_coord(void)
          * coordination between all CPUs.
          */
         for_each_possible_cpu(i) {
-                pr = processors[i];
+                pr = per_cpu(processors, i);
                 if (!pr)
                         continue;
 
@@ -93,7 +93,7 @@ static int acpi_processor_update_tsd_coord(void)
 
         cpus_clear(covered_cpus);
         for_each_possible_cpu(i) {
-                pr = processors[i];
+                pr = per_cpu(processors, i);
                 if (!pr)
                         continue;
 
@@ -119,7 +119,7 @@ static int acpi_processor_update_tsd_coord(void)
                         if (i == j)
                                 continue;
 
-                        match_pr = processors[j];
+                        match_pr = per_cpu(processors, j);
                         if (!match_pr)
                                 continue;
 
@@ -152,7 +152,7 @@ static int acpi_processor_update_tsd_coord(void)
                         if (i == j)
                                 continue;
 
-                        match_pr = processors[j];
+                        match_pr = per_cpu(processors, j);
                         if (!match_pr)
                                 continue;
 
@@ -172,7 +172,7 @@ static int acpi_processor_update_tsd_coord(void)
 
 err_ret:
         for_each_possible_cpu(i) {
-                pr = processors[i];
+                pr = per_cpu(processors, i);
                 if (!pr)
                         continue;
 
@@ -214,7 +214,7 @@ static int acpi_processor_throttling_notifier(unsigned long event, void *data)
         struct acpi_processor_throttling *p_throttling;
 
         cpu = p_tstate->cpu;
-        pr = processors[cpu];
+        pr = per_cpu(processors, cpu);
         if (!pr) {
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid pr pointer\n"));
                 return 0;
@@ -1035,7 +1035,7 @@ int acpi_processor_set_throttling(struct acpi_processor *pr, int state)
                  * cpus.
                  */
                 for_each_cpu_mask_nr(i, online_throttling_cpus) {
-                        match_pr = processors[i];
+                        match_pr = per_cpu(processors, i);
                         /*
                          * If the pointer is invalid, we will report the
                          * error message and continue.
@@ -1232,7 +1232,10 @@ static ssize_t acpi_processor_write_throttling(struct file *file,
         int result = 0;
         struct seq_file *m = file->private_data;
         struct acpi_processor *pr = m->private;
-        char state_string[12] = { '\0' };
+        char state_string[5] = "";
+        char *charp = NULL;
+        size_t state_val = 0;
+        char tmpbuf[5] = "";
 
         if (!pr || (count > sizeof(state_string) - 1))
                 return -EINVAL;
@@ -1241,10 +1244,23 @@ static ssize_t acpi_processor_write_throttling(struct file *file,
                 return -EFAULT;
 
         state_string[count] = '\0';
+        if ((count > 0) && (state_string[count-1] == '\n'))
+                state_string[count-1] = '\0';
 
-        result = acpi_processor_set_throttling(pr,
-                                               simple_strtoul(state_string,
-                                                              NULL, 0));
+        charp = state_string;
+        if ((state_string[0] == 't') || (state_string[0] == 'T'))
+                charp++;
+
+        state_val = simple_strtoul(charp, NULL, 0);
+        if (state_val >= pr->throttling.state_count)
+                return -EINVAL;
+
+        snprintf(tmpbuf, 5, "%zu", state_val);
+
+        if (strcmp(tmpbuf, charp) != 0)
+                return -EINVAL;
+
+        result = acpi_processor_set_throttling(pr, state_val);
         if (result)
                 return result;