arm64: uacce: remove clear q after uacce_fops_fasync

driver inclusion
category: bugfix
bugzilla: 13683
CVE: NA

-------------------------------------------------

uacce: remove clear q after uacce_fops_fasync

Feature or Bugfix:Bugfix
Signed-off-by: NZhou Wang <wangzhou1@hisilicon.com>
Reviewed-by: Nxuzaibo <xuzaibo@huawei.com>
Signed-off-by: NMingqiang Ling <lingmingqiang@huawei.com>
Reviewed-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/uacce/uacce.c

@@ -635,7 +635,6 @@ static int uacce_fops_flush(struct file *filep, fl_owner_t id)
 {
 	struct uacce_queue *q = filep->private_data;
 	struct uacce *uacce = q->uacce;
-	filep->private_data = NULL;
 
 	/*
 	 * It is different between CI and kernel-dev here, so delete list
@@ -648,6 +647,9 @@ static int uacce_fops_flush(struct file *filep, fl_owner_t id)
 	list_del(&q->q_dev);
 	mutex_unlock(&uacce->q_lock);
 
+	/* filep->private_date is still used by above uacce_fops_fasync */
+	filep->private_data = NULL;
+
 	return uacce_queue_drain(q);
 }