RDMA/hns: Remove unnecessary flush operation for workqueue

As a flush operation is implemented inside destroy_workqueue(), there is
no need to do flush operation before.

Fixes: bfcc681b ("IB/hns: Fix the bug when free mr")
Fixes: 0425e3e6 ("RDMA/hns: Support flush cqe for hip08 in kernel space")
Link: https://lore.kernel.org/r/1618305087-30799-1-git-send-email-liweihang@huawei.comSigned-off-by: Yixian Liu <liuyixian@huawei.com>
Signed-off-by: Weihang Li <liweihang@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/hns/hns_roce_hw_v1.c

@@ -1382,7 +1382,6 @@ static int hns_roce_free_mr_init(struct hns_roce_dev *hr_dev)
 	ret = hns_roce_v1_rsv_lp_qp(hr_dev);
 	if (ret) {
 		dev_err(dev, "Reserved loop qp failed(%d)!\n", ret);
-		flush_workqueue(free_mr->free_mr_wq);
 		destroy_workqueue(free_mr->free_mr_wq);
 	}
 
@@ -1394,7 +1393,6 @@ static void hns_roce_free_mr_free(struct hns_roce_dev *hr_dev)
 	struct hns_roce_v1_priv *priv = hr_dev->priv;
 	struct hns_roce_free_mr *free_mr = &priv->free_mr;
 
-	flush_workqueue(free_mr->free_mr_wq);
 	destroy_workqueue(free_mr->free_mr_wq);
 
 	hns_roce_v1_release_lp_qp(hr_dev);

drivers/infiniband/hw/hns/hns_roce_hw_v2.c

@@ -6404,7 +6404,6 @@ static void hns_roce_v2_cleanup_eq_table(struct hns_roce_dev *hr_dev)
 	hns_roce_v2_int_mask_enable(hr_dev, eq_num, EQ_DISABLE);
 
 	__hns_roce_free_irq(hr_dev);
-	flush_workqueue(hr_dev->irq_workq);
 	destroy_workqueue(hr_dev->irq_workq);
 
 	for (i = 0; i < eq_num; i++) {