diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index aa2e394745c27f4157403e6d0274c1aa2760de74..72a8c70094aba3cb3e09def04ad844da5a52377b 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -1091,6 +1091,9 @@ int unregister_sysrq_key(int key, struct sysrq_key_op *op_p)
 EXPORT_SYMBOL(unregister_sysrq_key);
 
 #ifdef CONFIG_PROC_FS
+
+static DEFINE_MUTEX(sysrq_mutex);
+
 /*
  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
  */
@@ -1102,7 +1105,10 @@ static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 
 		if (get_user(c, buf))
 			return -EFAULT;
+
+		mutex_lock(&sysrq_mutex);
 		__handle_sysrq(c, false);
+		mutex_unlock(&sysrq_mutex);
 	}
 
 	return count;