!4262 [sync] PR-4255: drm/amdgpu: Fix potential fence use-after-free v2

Merge Pull Request from: @openeuler-sync-bot 
 

Origin pull request: 
https://gitee.com/openeuler/kernel/pulls/4255 
 
PR sync from: GUO Zihua <guozihua@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/VOH63IKM2FSSI5CULEGOZJNL75B7KN57/ 
 
https://gitee.com/src-openeuler/kernel/issues/I8YD58 
 
Link:https://gitee.com/openeuler/kernel/pulls/4262

 

Reviewed-by: Lu Jialin <lujialin4@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>