Pull acpi_bus_register_driver into release branch

[pandora-kernel.git] / drivers / acpi / processor_thermal.c

diff --git a/drivers/acpi/processor_thermal.c b/drivers/acpi/processor_thermal.c
index 37528c3..f99ad05 100644 (file)
--- a/drivers/acpi/processor_thermal.c
+++ b/drivers/acpi/processor_thermal.c
@@ -101,11 +101,9 @@ static unsigned int acpi_thermal_cpufreq_is_init = 0;
 static int cpu_has_cpufreq(unsigned int cpu)
 {
        struct cpufreq_policy policy;
-       if (!acpi_thermal_cpufreq_is_init)
-               return -ENODEV;
-       if (!cpufreq_get_policy(&policy, cpu))
-               return -ENODEV;
-       return 0;
+       if (!acpi_thermal_cpufreq_is_init || cpufreq_get_policy(&policy, cpu))
+               return 0;
+       return 1;
 }
 
 static int acpi_thermal_cpufreq_increase(unsigned int cpu)
@@ -127,13 +125,13 @@ static int acpi_thermal_cpufreq_decrease(unsigned int cpu)
        if (!cpu_has_cpufreq(cpu))
                return -ENODEV;
 
-       if (cpufreq_thermal_reduction_pctg[cpu] >= 20) {
+       if (cpufreq_thermal_reduction_pctg[cpu] > 20)
                cpufreq_thermal_reduction_pctg[cpu] -= 20;
-               cpufreq_update_policy(cpu);
-               return 0;
-       }
-
-       return -ERANGE;
+       else
+               cpufreq_thermal_reduction_pctg[cpu] = 0;
+       cpufreq_update_policy(cpu);
+       /* We reached max freq again and can leave passive mode */
+       return !cpufreq_thermal_reduction_pctg[cpu];
 }
 
 static int acpi_thermal_cpufreq_notifier(struct notifier_block *nb,
@@ -200,7 +198,7 @@ int acpi_processor_set_thermal_limit(acpi_handle handle, int type)
        int result = 0;
        struct acpi_processor *pr = NULL;
        struct acpi_device *device = NULL;
-       int tx = 0;
+       int tx = 0, max_tx_px = 0;
 
        ACPI_FUNCTION_TRACE("acpi_processor_set_thermal_limit");
 
@@ -259,19 +257,27 @@ int acpi_processor_set_thermal_limit(acpi_handle handle, int type)
                /* if going down: T-states first, P-states later */
 
                if (pr->flags.throttling) {
-                       if (tx == 0)
+                       if (tx == 0) {
+                               max_tx_px = 1;
                                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                                  "At minimum throttling state\n"));
-                       else {
+                       } else {
                                tx--;
                                goto end;
                        }
                }
 
                result = acpi_thermal_cpufreq_decrease(pr->id);
-               if (result == -ERANGE)
+               if (result) {
+                       /*
+                        * We only could get -ERANGE, 1 or 0.
+                        * In the first two cases we reached max freq again.
+                        */
                        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                          "At minimum performance state\n"));
+                       max_tx_px = 1;
+               } else
+                       max_tx_px = 0;
 
                break;
        }
@@ -290,8 +296,10 @@ int acpi_processor_set_thermal_limit(acpi_handle handle, int type)
                                  pr->limit.thermal.px, pr->limit.thermal.tx));
        } else
                result = 0;
-
-       return_VALUE(result);
+       if (max_tx_px)
+               return_VALUE(1);
+       else
+               return_VALUE(result);
 }
 
 int acpi_processor_get_limit_info(struct acpi_processor *pr)
@@ -340,9 +348,9 @@ static int acpi_processor_limit_open_fs(struct inode *inode, struct file *file)
                           PDE(inode)->data);
 }
 
-ssize_t acpi_processor_write_limit(struct file * file,
-                                  const char __user * buffer,
-                                  size_t count, loff_t * data)
+static ssize_t acpi_processor_write_limit(struct file * file,
+                                         const char __user * buffer,
+                                         size_t count, loff_t * data)
 {
        int result = 0;
        struct seq_file *m = (struct seq_file *)file->private_data;
@@ -386,6 +394,7 @@ ssize_t acpi_processor_write_limit(struct file * file,
 struct file_operations acpi_processor_limit_fops = {
        .open = acpi_processor_limit_open_fs,
        .read = seq_read,
+       .write = acpi_processor_write_limit,
        .llseek = seq_lseek,
        .release = single_release,
 };