crypto: hisilicon/qm - prevent soft lockup in qm_poll_req_cb()'s loop

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7AUVE
CVE: NA

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

The function qm_poll_req_cb() may take a while due to complex req_cb,
so soft lockup may occur in kernel with preemption disabled.
Add a cond_resched() to prevent that.
Signed-off-by: NWeili Qian <qianweili@huawei.com>
Signed-off-by: NJiangShui Yang <yangjiangshui@h-partners.com>
(cherry picked from commit d07dbb66)

drivers/crypto/hisilicon/qm.c

@@ -869,6 +869,8 @@ static void qm_poll_req_cb(struct hisi_qp *qp)
 		qm_db(qm, qp->qp_id, QM_DOORBELL_CMD_CQ,
 		      qp->qp_status.cq_head, 0);
 		atomic_dec(&qp->qp_status.used);
+
+		cond_resched();
 	}
 
 	/* set c_flag */