Commit d07dbb66 authored by Weili Qian's avatar Weili Qian Committed by JiangShui
Browse files

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: default avatarWeili Qian <qianweili@huawei.com>
Signed-off-by: default avatarJiangShui Yang <yangjiangshui@h-partners.com>
parent f29efbf3

drivers/crypto/hisilicon/qm.c

+2 −0
Original line number Diff line number Diff line
@@ -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 */