4 files changed, 24 insertions, 7 deletions

diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index ea512f47b789..e0a899f25e37 100644
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -20,6 +20,9 @@ if CPU_FREQ
 config CPU_FREQ_TABLE
         tristate
 
+config CPU_FREQ_GOV_COMMON
+        bool
+
 config CPU_FREQ_STAT
         tristate "CPU frequency translation statistics"
         select CPU_FREQ_TABLE
@@ -141,6 +144,7 @@ config CPU_FREQ_GOV_USERSPACE
 config CPU_FREQ_GOV_ONDEMAND
         tristate "'ondemand' cpufreq policy governor"
         select CPU_FREQ_TABLE
+        select CPU_FREQ_GOV_COMMON
         help
           'ondemand' - This driver adds a dynamic cpufreq policy governor.
           The governor does a periodic polling and 
@@ -159,6 +163,7 @@ config CPU_FREQ_GOV_ONDEMAND
 config CPU_FREQ_GOV_CONSERVATIVE
         tristate "'conservative' cpufreq governor"
         depends on CPU_FREQ
+        select CPU_FREQ_GOV_COMMON
         help
           'conservative' - this driver is rather similar to the 'ondemand'
           governor both in its source code and its purpose, the difference is
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index 1f254ec087c1..fadc4d496e2f 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -7,8 +7,9 @@ obj-$(CONFIG_CPU_FREQ_STAT)             += cpufreq_stats.o
 obj-$(CONFIG_CPU_FREQ_GOV_PERFORMANCE)  += cpufreq_performance.o
 obj-$(CONFIG_CPU_FREQ_GOV_POWERSAVE)    += cpufreq_powersave.o
 obj-$(CONFIG_CPU_FREQ_GOV_USERSPACE)    += cpufreq_userspace.o
-obj-$(CONFIG_CPU_FREQ_GOV_ONDEMAND)     += cpufreq_ondemand.o cpufreq_governor.o
-obj-$(CONFIG_CPU_FREQ_GOV_CONSERVATIVE) += cpufreq_conservative.o cpufreq_governor.o
+obj-$(CONFIG_CPU_FREQ_GOV_ONDEMAND)     += cpufreq_ondemand.o
+obj-$(CONFIG_CPU_FREQ_GOV_CONSERVATIVE) += cpufreq_conservative.o
+obj-$(CONFIG_CPU_FREQ_GOV_COMMON)               += cpufreq_governor.o
 
 # CPUfreq cross-arch helpers
 obj-$(CONFIG_CPU_FREQ_TABLE)            += freq_table.o
diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index e40e50809644..9d7732b81044 100644
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -364,18 +364,21 @@ static int __init cpufreq_stats_init(void)
         if (ret)
                 return ret;
 
+        register_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
+        for_each_online_cpu(cpu)
+                cpufreq_update_policy(cpu);
+
         ret = cpufreq_register_notifier(&notifier_trans_block,
                                 CPUFREQ_TRANSITION_NOTIFIER);
         if (ret) {
                 cpufreq_unregister_notifier(&notifier_policy_block,
                                 CPUFREQ_POLICY_NOTIFIER);
+                unregister_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
+                for_each_online_cpu(cpu)
+                        cpufreq_stats_free_table(cpu);
                 return ret;
         }
 
-        register_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
-        for_each_online_cpu(cpu) {
-                cpufreq_update_policy(cpu);
-        }
         return 0;
 }
 static void __exit cpufreq_stats_exit(void)
diff --git a/drivers/cpufreq/longhaul.c b/drivers/cpufreq/longhaul.c
index f1fa500ac105..1180d536d1eb 100644
--- a/drivers/cpufreq/longhaul.c
+++ b/drivers/cpufreq/longhaul.c
@@ -77,7 +77,7 @@ static unsigned int longhaul_index;
 static int scale_voltage;
 static int disable_acpi_c3;
 static int revid_errata;
-
+static int enable;
 
 /* Clock ratios multiplied by 10 */
 static int mults[32];
@@ -965,6 +965,10 @@ static int __init longhaul_init(void)
         if (!x86_match_cpu(longhaul_id))
                 return -ENODEV;
 
+        if (!enable) {
+                printk(KERN_ERR PFX "Option \"enable\" not set. Aborting.\n");
+                return -ENODEV;
+        }
 #ifdef CONFIG_SMP
         if (num_online_cpus() > 1) {
                 printk(KERN_ERR PFX "More than 1 CPU detected, "
@@ -1021,6 +1025,10 @@ MODULE_PARM_DESC(scale_voltage, "Scale voltage of processor");
  * such. */
 module_param(revid_errata, int, 0644);
 MODULE_PARM_DESC(revid_errata, "Ignore CPU Revision ID");
+/* By default driver is disabled to prevent incompatible
+ * system freeze. */
+module_param(enable, int, 0644);
+MODULE_PARM_DESC(enable, "Enable driver");
 
 MODULE_AUTHOR("Dave Jones <davej@redhat.com>");
 MODULE_DESCRIPTION("Longhaul driver for VIA Cyrix processors.");