[CPUFREQ] handle sysfs errors
Jeff Garzik [Fri, 20 Oct 2006 21:31:00 +0000 (14:31 -0700)]
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Dave Jones <davej@redhat.com>

drivers/cpufreq/cpufreq_conservative.c
drivers/cpufreq/cpufreq_ondemand.c
drivers/cpufreq/cpufreq_userspace.c

index c4c578d..8fe13ec 100644 (file)
@@ -453,6 +453,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
        unsigned int cpu = policy->cpu;
        struct cpu_dbs_info_s *this_dbs_info;
        unsigned int j;
+       int rc;
 
        this_dbs_info = &per_cpu(cpu_dbs_info, cpu);
 
@@ -469,6 +470,13 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                        break;
                 
                mutex_lock(&dbs_mutex);
+
+               rc = sysfs_create_group(&policy->kobj, &dbs_attr_group);
+               if (rc) {
+                       mutex_unlock(&dbs_mutex);
+                       return rc;
+               }
+
                for_each_cpu_mask(j, policy->cpus) {
                        struct cpu_dbs_info_s *j_dbs_info;
                        j_dbs_info = &per_cpu(cpu_dbs_info, j);
@@ -481,7 +489,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                this_dbs_info->enable = 1;
                this_dbs_info->down_skip = 0;
                this_dbs_info->requested_freq = policy->cur;
-               sysfs_create_group(&policy->kobj, &dbs_attr_group);
+
                dbs_enable++;
                /*
                 * Start the timerschedule work, when this governor
index 291cfe9..cbde076 100644 (file)
@@ -473,6 +473,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
        unsigned int cpu = policy->cpu;
        struct cpu_dbs_info_s *this_dbs_info;
        unsigned int j;
+       int rc;
 
        this_dbs_info = &per_cpu(cpu_dbs_info, cpu);
 
@@ -501,6 +502,16 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                                return -ENOSPC;
                        }
                }
+
+               rc = sysfs_create_group(&policy->kobj, &dbs_attr_group);
+               if (rc) {
+                       if (dbs_enable == 1)
+                               destroy_workqueue(kondemand_wq);
+                       dbs_enable--;
+                       mutex_unlock(&dbs_mutex);
+                       return rc;
+               }
+
                for_each_cpu_mask(j, policy->cpus) {
                        struct cpu_dbs_info_s *j_dbs_info;
                        j_dbs_info = &per_cpu(cpu_dbs_info, j);
@@ -510,7 +521,6 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                        j_dbs_info->prev_cpu_wall = get_jiffies_64();
                }
                this_dbs_info->enable = 1;
-               sysfs_create_group(&policy->kobj, &dbs_attr_group);
                /*
                 * Start the timerschedule work, when this governor
                 * is used for first time
index a06c204..2a4eb0b 100644 (file)
@@ -131,19 +131,26 @@ static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
                                   unsigned int event)
 {
        unsigned int cpu = policy->cpu;
+       int rc = 0;
+
        switch (event) {
        case CPUFREQ_GOV_START:
                if (!cpu_online(cpu))
                        return -EINVAL;
                BUG_ON(!policy->cur);
                mutex_lock(&userspace_mutex);
+               rc = sysfs_create_file (&policy->kobj,
+                                       &freq_attr_scaling_setspeed.attr);
+               if (rc)
+                       goto start_out;
+
                cpu_is_managed[cpu] = 1;
                cpu_min_freq[cpu] = policy->min;
                cpu_max_freq[cpu] = policy->max;
                cpu_cur_freq[cpu] = policy->cur;
                cpu_set_freq[cpu] = policy->cur;
-               sysfs_create_file (&policy->kobj, &freq_attr_scaling_setspeed.attr);
                dprintk("managing cpu %u started (%u - %u kHz, currently %u kHz)\n", cpu, cpu_min_freq[cpu], cpu_max_freq[cpu], cpu_cur_freq[cpu]);
+start_out:
                mutex_unlock(&userspace_mutex);
                break;
        case CPUFREQ_GOV_STOP:
@@ -180,7 +187,7 @@ static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
                mutex_unlock(&userspace_mutex);
                break;
        }
-       return 0;
+       return rc;
 }