diff --git a/drivers/staging/hungtask/hungtask_user.c b/drivers/staging/hungtask/hungtask_user.c
index 39b0b1bd50351415d8c2d831c1477cab65b81032..4d4627132a37780a773fe416f160f853e4c61cad 100644
--- a/drivers/staging/hungtask/hungtask_user.c
+++ b/drivers/staging/hungtask/hungtask_user.c
@@ -38,13 +38,18 @@ static void htuser_show_task(int pid)
 {
 	struct task_struct *p = NULL;
 
+	rcu_read_lock();
 	p = pid_task(find_vpid(pid), PIDTYPE_PID);
-	if (p == NULL) {
+	if(p)
+	    get_task_struct(p);
+	rcu_read_unlock();
+	if (!p) {
 		pr_err("can not find pid %d\n", pid);
 		return;
 	}
 
 	if (p->flags & PF_FROZEN) {
+		put_task_struct(p);
 		pr_info("process %d is frozen\n", pid);
 		return;
 	}
@@ -53,6 +58,7 @@ static void htuser_show_task(int pid)
 		sched_show_task(p);
 		pr_err("UserList_KernelStack end\n");
 	}
+	put_task_struct(p);
 }
 
 static void htuser_list_insert(int pid, int count)
@@ -242,7 +248,7 @@ ssize_t htuser_list_store(struct kobject *kobj,
 	len = p ? (size_t)(p - buf) : count;
 	strncpy(tmp, buf, len);
 
-	if (strncmp(tmp, "on", CMD_MIN_LEN) == 0) {
+	if (strncmp(tmp, "on,", CMD_MIN_LEN) == 0) {
 		if (htuser_list_store_on(tmp, len, pid))
 			return -EINVAL;
 	} else if (unlikely(strncmp(tmp, "off", CMD_MIN_LEN) == 0)) {