1 files changed, 15 insertions, 5 deletions

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 2316f50b07a4..506edcc500c4 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -41,6 +41,8 @@
 #define NMI_WATCHDOG_ENABLED      (1 << NMI_WATCHDOG_ENABLED_BIT)
 #define SOFT_WATCHDOG_ENABLED     (1 << SOFT_WATCHDOG_ENABLED_BIT)
 
+static DEFINE_MUTEX(watchdog_proc_mutex);
+
 #ifdef CONFIG_HARDLOCKUP_DETECTOR
 static unsigned long __read_mostly watchdog_enabled = SOFT_WATCHDOG_ENABLED|NMI_WATCHDOG_ENABLED;
 #else
@@ -608,26 +610,36 @@ void watchdog_nmi_enable_all(void)
 {
         int cpu;
 
-        if (!watchdog_user_enabled)
-                return;
+        mutex_lock(&watchdog_proc_mutex);
+
+        if (!(watchdog_enabled & NMI_WATCHDOG_ENABLED))
+                goto unlock;
 
         get_online_cpus();
         for_each_online_cpu(cpu)
                 watchdog_nmi_enable(cpu);
         put_online_cpus();
+
+unlock:
+        mutex_lock(&watchdog_proc_mutex);
 }
 
 void watchdog_nmi_disable_all(void)
 {
         int cpu;
 
+        mutex_lock(&watchdog_proc_mutex);
+
         if (!watchdog_running)
-                return;
+                goto unlock;
 
         get_online_cpus();
         for_each_online_cpu(cpu)
                 watchdog_nmi_disable(cpu);
         put_online_cpus();
+
+unlock:
+        mutex_unlock(&watchdog_proc_mutex);
 }
 #else
 static int watchdog_nmi_enable(unsigned int cpu) { return 0; }
@@ -744,8 +756,6 @@ static int proc_watchdog_update(void)
 
 }
 
-static DEFINE_MUTEX(watchdog_proc_mutex);
-
 /*
  * common function for watchdog, nmi_watchdog and soft_watchdog parameter
  *