mainline inclusion
from mainline-5.1-rc1
commit 1602a7b7
category: bugfix
bugzilla: 51818
CVE: NA

-------------------------------------------------
Use READ_ONCE() to tell the compiler to not optimse away the read of
xprt->xpt_flags in svc_xprt_release_slot().
Signed-off-by: NTrond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>
Signed-off-by: NZhang Changzhong <zhangchangzhong@huawei.com>
Reviewed-by: NYue Haibing <yuehaibing@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>