Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6

[~andy/linux] / drivers / cpufreq / cpufreq.c

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 9528bd577365d3c5fb465fee4a7971393e5392fa..b730d670952957871f2eecf3f35989e673c70855 100644 (file)
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -828,11 +828,8 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
        memcpy(&new_policy, policy, sizeof(struct cpufreq_policy));
 
        /* prepare interface data */
-       policy->kobj.parent = &sys_dev->kobj;
-       policy->kobj.ktype = &ktype_cpufreq;
-       strlcpy(policy->kobj.name, "cpufreq", KOBJ_NAME_LEN);
-
-       ret = kobject_register(&policy->kobj);
+       ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq, &sys_dev->kobj,
+                                  "cpufreq");
        if (ret) {
                unlock_policy_rwsem_write(cpu);
                goto err_out_driver_exit;
@@ -841,19 +838,25 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
        drv_attr = cpufreq_driver->attr;
        while ((drv_attr) && (*drv_attr)) {
                ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr));
-               if (ret)
+               if (ret) {
+                       unlock_policy_rwsem_write(cpu);
                        goto err_out_driver_exit;
+               }
                drv_attr++;
        }
        if (cpufreq_driver->get){
                ret = sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr);
-               if (ret)
+               if (ret) {
+                       unlock_policy_rwsem_write(cpu);
                        goto err_out_driver_exit;
+               }
        }
        if (cpufreq_driver->target){
                ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr);
-               if (ret)
+               if (ret) {
+                       unlock_policy_rwsem_write(cpu);
                        goto err_out_driver_exit;
+               }
        }
 
        spin_lock_irqsave(&cpufreq_driver_lock, flags);
@@ -896,6 +899,7 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
                goto err_out_unregister;
        }
 
+       kobject_uevent(&policy->kobj, KOBJ_ADD);
        module_put(cpufreq_driver->owner);
        dprintk("initialization complete\n");
        cpufreq_debug_enable_ratelimit();
@@ -909,7 +913,7 @@ err_out_unregister:
                cpufreq_cpu_data[j] = NULL;
        spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
 
-       kobject_unregister(&policy->kobj);
+       kobject_put(&policy->kobj);
        wait_for_completion(&policy->kobj_unregister);
 
 err_out_driver_exit:
@@ -1026,8 +1030,6 @@ static int __cpufreq_remove_dev (struct sys_device * sys_dev)
 
        unlock_policy_rwsem_write(cpu);
 
-       kobject_unregister(&data->kobj);
-
        kobject_put(&data->kobj);
 
        /* we need to make sure that the underlying kobj is actually
@@ -1111,12 +1113,7 @@ unsigned int cpufreq_quick_get(unsigned int cpu)
        unsigned int ret_freq = 0;
 
        if (policy) {
-               if (unlikely(lock_policy_rwsem_read(cpu)))
-                       return ret_freq;
-
                ret_freq = policy->cur;
-
-               unlock_policy_rwsem_read(cpu);
                cpufreq_cpu_put(policy);
        }
 
@@ -1485,6 +1482,31 @@ static int __cpufreq_governor(struct cpufreq_policy *policy,
 {
        int ret;
 
+       /* Only must be defined when default governor is known to have latency
+          restrictions, like e.g. conservative or ondemand.
+          That this is the case is already ensured in Kconfig
+       */
+#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
+       struct cpufreq_governor *gov = &cpufreq_gov_performance;
+#else
+       struct cpufreq_governor *gov = NULL;
+#endif
+
+       if (policy->governor->max_transition_latency &&
+           policy->cpuinfo.transition_latency >
+           policy->governor->max_transition_latency) {
+               if (!gov)
+                       return -EINVAL;
+               else {
+                       printk(KERN_WARNING "%s governor failed, too long"
+                              " transition latency of HW, fallback"
+                              " to %s governor\n",
+                              policy->governor->name,
+                              gov->name);
+                       policy->governor = gov;
+               }
+       }
+
        if (!try_module_get(policy->governor->owner))
                return -EINVAL;
 
@@ -1582,7 +1604,7 @@ static int __cpufreq_set_policy(struct cpufreq_policy *data,
        memcpy(&policy->cpuinfo, &data->cpuinfo,
                                sizeof(struct cpufreq_cpuinfo));
 
-       if (policy->min > data->min && policy->min > policy->max) {
+       if (policy->min > data->max || policy->max < data->min) {
                ret = -EINVAL;
                goto error_out;
        }
@@ -1705,7 +1727,7 @@ int cpufreq_update_policy(unsigned int cpu)
 }
 EXPORT_SYMBOL(cpufreq_update_policy);
 
-static int cpufreq_cpu_callback(struct notifier_block *nfb,
+static int __cpuinit cpufreq_cpu_callback(struct notifier_block *nfb,
                                        unsigned long action, void *hcpu)
 {
        unsigned int cpu = (unsigned long)hcpu;