RDMA: Clean destroy CQ in drivers do not return errors

Like all other destroy commands, .destroy_cq() call is not supposed
to fail. In all flows, the attempt to return earlier caused to memory
leaks.

This patch converts .destroy_cq() to do not return any errors.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Acked-by: Gal Pressman <galpress@amazon.com>
Acked-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/core/cq.c

@@ -207,8 +207,6 @@ EXPORT_SYMBOL(__ib_alloc_cq_user);
  */
 void ib_free_cq_user(struct ib_cq *cq, struct ib_udata *udata)
 {
-	int ret;
-
 	if (WARN_ON_ONCE(atomic_read(&cq->usecnt)))
 		return;
 
@@ -228,7 +226,6 @@ void ib_free_cq_user(struct ib_cq *cq, struct ib_udata *udata)
 
 	kfree(cq->wc);
 	rdma_restrack_del(&cq->res);
-	ret = cq->device->ops.destroy_cq(cq, udata);
-	WARN_ON_ONCE(ret);
+	cq->device->ops.destroy_cq(cq, udata);
 }
 EXPORT_SYMBOL(ib_free_cq_user);

drivers/infiniband/core/verbs.c

@@ -1949,7 +1949,8 @@ int ib_destroy_cq_user(struct ib_cq *cq, struct ib_udata *udata)
 		return -EBUSY;
 
 	rdma_restrack_del(&cq->res);
-	return cq->device->ops.destroy_cq(cq, udata);
+	cq->device->ops.destroy_cq(cq, udata);
+	return 0;
 }
 EXPORT_SYMBOL(ib_destroy_cq_user);
 

drivers/infiniband/hw/bnxt_re/ib_verbs.c

@@ -2517,9 +2517,8 @@ int bnxt_re_post_recv(struct ib_qp *ib_qp, const struct ib_recv_wr *wr,
 }
 
 /* Completion Queues */
-int bnxt_re_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
+void bnxt_re_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
 {
-	int rc;
 	struct bnxt_re_cq *cq;
 	struct bnxt_qplib_nq *nq;
 	struct bnxt_re_dev *rdev;
@@ -2528,20 +2527,14 @@ int bnxt_re_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
 	rdev = cq->rdev;
 	nq = cq->qplib_cq.nq;
 
-	rc = bnxt_qplib_destroy_cq(&rdev->qplib_res, &cq->qplib_cq);
-	if (rc) {
-		dev_err(rdev_to_dev(rdev), "Failed to destroy HW CQ");
-		return rc;
-	}
-	if (!IS_ERR_OR_NULL(cq->umem))
+	bnxt_qplib_destroy_cq(&rdev->qplib_res, &cq->qplib_cq);
+	if (!cq->umem)
 		ib_umem_release(cq->umem);
 
 	atomic_dec(&rdev->cq_count);
 	nq->budget--;
 	kfree(cq->cql);
 	kfree(cq);
-
-	return 0;
 }
 
 struct ib_cq *bnxt_re_create_cq(struct ib_device *ibdev,

drivers/infiniband/hw/bnxt_re/ib_verbs.h

@@ -193,7 +193,7 @@ int bnxt_re_post_recv(struct ib_qp *qp, const struct ib_recv_wr *recv_wr,
 struct ib_cq *bnxt_re_create_cq(struct ib_device *ibdev,
 				const struct ib_cq_init_attr *attr,
 				struct ib_udata *udata);
-int bnxt_re_destroy_cq(struct ib_cq *cq, struct ib_udata *udata);
+void bnxt_re_destroy_cq(struct ib_cq *cq, struct ib_udata *udata);
 int bnxt_re_poll_cq(struct ib_cq *cq, int num_entries, struct ib_wc *wc);
 int bnxt_re_req_notify_cq(struct ib_cq *cq, enum ib_cq_notify_flags flags);
 struct ib_mr *bnxt_re_get_dma_mr(struct ib_pd *pd, int mr_access_flags);

drivers/infiniband/hw/cxgb3/cxio_hal.c

@@ -303,17 +303,15 @@ int cxio_create_qp(struct cxio_rdev *rdev_p, u32 kernel_domain,
 	return -ENOMEM;
 }
 
-int cxio_destroy_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
+void cxio_destroy_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
 {
-	int err;
-	err = cxio_hal_clear_cq_ctx(rdev_p, cq->cqid);
+	cxio_hal_clear_cq_ctx(rdev_p, cq->cqid);
 	kfree(cq->sw_queue);
 	dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
 			  (1UL << (cq->size_log2))
 			  * sizeof(struct t3_cqe) + 1, cq->queue,
 			  dma_unmap_addr(cq, mapping));
 	cxio_hal_put_cqid(rdev_p->rscp, cq->cqid);
-	return err;
 }
 
 int cxio_destroy_qp(struct cxio_rdev *rdev_p, struct t3_wq *wq,

drivers/infiniband/hw/cxgb3/cxio_hal.h

@@ -158,7 +158,7 @@ void cxio_rdev_close(struct cxio_rdev *rdev);
 int cxio_hal_cq_op(struct cxio_rdev *rdev, struct t3_cq *cq,
 		   enum t3_cq_opcode op, u32 credit);
 int cxio_create_cq(struct cxio_rdev *rdev, struct t3_cq *cq, int kernel);
-int cxio_destroy_cq(struct cxio_rdev *rdev, struct t3_cq *cq);
+void cxio_destroy_cq(struct cxio_rdev *rdev, struct t3_cq *cq);
 void cxio_release_ucontext(struct cxio_rdev *rdev, struct cxio_ucontext *uctx);
 void cxio_init_ucontext(struct cxio_rdev *rdev, struct cxio_ucontext *uctx);
 int cxio_create_qp(struct cxio_rdev *rdev, u32 kernel_domain, struct t3_wq *wq,

drivers/infiniband/hw/cxgb3/iwch_provider.c

@@ -88,7 +88,7 @@ static int iwch_alloc_ucontext(struct ib_ucontext *ucontext,
 	return 0;
 }
 
-static int iwch_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
+static void iwch_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
 {
 	struct iwch_cq *chp;
 
@@ -101,7 +101,6 @@ static int iwch_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
 
 	cxio_destroy_cq(&chp->rhp->rdev, &chp->cq);
 	kfree(chp);
-	return 0;
 }
 
 static struct ib_cq *iwch_create_cq(struct ib_device *ibdev,

drivers/infiniband/hw/cxgb4/cq.c

@@ -34,14 +34,13 @@
 
 #include "iw_cxgb4.h"
 
-static int destroy_cq(struct c4iw_rdev *rdev, struct t4_cq *cq,
-		      struct c4iw_dev_ucontext *uctx, struct sk_buff *skb,
-		      struct c4iw_wr_wait *wr_waitp)
+static void destroy_cq(struct c4iw_rdev *rdev, struct t4_cq *cq,
+		       struct c4iw_dev_ucontext *uctx, struct sk_buff *skb,
+		       struct c4iw_wr_wait *wr_waitp)
 {
 	struct fw_ri_res_wr *res_wr;
 	struct fw_ri_res *res;
 	int wr_len;
-	int ret;
 
 	wr_len = sizeof(*res_wr) + sizeof(*res);
 	set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0);
@@ -59,14 +58,13 @@ static int destroy_cq(struct c4iw_rdev *rdev, struct t4_cq *cq,
 	res->u.cq.iqid = cpu_to_be32(cq->cqid);
 
 	c4iw_init_wr_wait(wr_waitp);
-	ret = c4iw_ref_send_wait(rdev, skb, wr_waitp, 0, 0, __func__);
+	c4iw_ref_send_wait(rdev, skb, wr_waitp, 0, 0, __func__);
 
 	kfree(cq->sw_queue);
 	dma_free_coherent(&(rdev->lldi.pdev->dev),
 			  cq->memsize, cq->queue,
 			  dma_unmap_addr(cq, mapping));
 	c4iw_put_cqid(rdev, cq->cqid, uctx);
-	return ret;
 }
 
 static int create_cq(struct c4iw_rdev *rdev, struct t4_cq *cq,
@@ -970,7 +968,7 @@ int c4iw_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
 	return !err || err == -ENODATA ? npolled : err;
 }
 
-int c4iw_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
+void c4iw_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
 {
 	struct c4iw_cq *chp;
 	struct c4iw_ucontext *ucontext;
@@ -989,7 +987,6 @@ int c4iw_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
 		   chp->destroy_skb, chp->wr_waitp);
 	c4iw_put_wr_wait(chp->wr_waitp);
 	kfree(chp);
-	return 0;
 }
 
 struct ib_cq *c4iw_create_cq(struct ib_device *ibdev,

drivers/infiniband/hw/cxgb4/iw_cxgb4.h

@@ -992,7 +992,7 @@ struct ib_mr *c4iw_reg_user_mr(struct ib_pd *pd, u64 start,
 					   struct ib_udata *udata);
 struct ib_mr *c4iw_get_dma_mr(struct ib_pd *pd, int acc);
 int c4iw_dereg_mr(struct ib_mr *ib_mr, struct ib_udata *udata);
-int c4iw_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata);
+void c4iw_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata);
 struct ib_cq *c4iw_create_cq(struct ib_device *ibdev,
 			     const struct ib_cq_init_attr *attr,
 			     struct ib_udata *udata);

drivers/infiniband/hw/efa/efa.h

@@ -134,7 +134,7 @@ int efa_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata);
 struct ib_qp *efa_create_qp(struct ib_pd *ibpd,
 			    struct ib_qp_init_attr *init_attr,
 			    struct ib_udata *udata);
-int efa_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata);
+void efa_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata);
 struct ib_cq *efa_create_cq(struct ib_device *ibdev,
 			    const struct ib_cq_init_attr *attr,
 			    struct ib_udata *udata);

drivers/infiniband/hw/efa/efa_verbs.c

@@ -847,25 +847,20 @@ static int efa_destroy_cq_idx(struct efa_dev *dev, int cq_idx)
 	return efa_com_destroy_cq(&dev->edev, &params);
 }
 
-int efa_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata)
+void efa_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata)
 {
 	struct efa_dev *dev = to_edev(ibcq->device);
 	struct efa_cq *cq = to_ecq(ibcq);
-	int err;
 
 	ibdev_dbg(&dev->ibdev,
 		  "Destroy cq[%d] virt[0x%p] freed: size[%lu], dma[%pad]\n",
 		  cq->cq_idx, cq->cpu_addr, cq->size, &cq->dma_addr);
 
-	err = efa_destroy_cq_idx(dev, cq->cq_idx);
-	if (err)
-		return err;
-
+	efa_destroy_cq_idx(dev, cq->cq_idx);
 	dma_unmap_single(&dev->pdev->dev, cq->dma_addr, cq->size,
 			 DMA_FROM_DEVICE);
 
 	kfree(cq);
-	return 0;
 }
 
 static int cq_mmap_entries_setup(struct efa_dev *dev, struct efa_cq *cq,

drivers/infiniband/hw/hns/hns_roce_cq.c

@@ -443,40 +443,36 @@ struct ib_cq *hns_roce_ib_create_cq(struct ib_device *ib_dev,
 }
 EXPORT_SYMBOL_GPL(hns_roce_ib_create_cq);
 
-int hns_roce_ib_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
+void hns_roce_ib_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
 {
 	struct hns_roce_dev *hr_dev = to_hr_dev(ib_cq->device);
 	struct hns_roce_cq *hr_cq = to_hr_cq(ib_cq);
-	int ret = 0;
 
 	if (hr_dev->hw->destroy_cq) {
-		ret = hr_dev->hw->destroy_cq(ib_cq, udata);
-	} else {
-		hns_roce_free_cq(hr_dev, hr_cq);
-		hns_roce_mtt_cleanup(hr_dev, &hr_cq->hr_buf.hr_mtt);
-
-		if (udata) {
-			ib_umem_release(hr_cq->umem);
-
-			if (hr_cq->db_en == 1)
-				hns_roce_db_unmap_user(
-					rdma_udata_to_drv_context(
-						udata,
-						struct hns_roce_ucontext,
-						ibucontext),
-					&hr_cq->db);
-		} else {
-			/* Free the buff of stored cq */
-			hns_roce_ib_free_cq_buf(hr_dev, &hr_cq->hr_buf,
-						ib_cq->cqe);
-			if (hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_RECORD_DB)
-				hns_roce_free_db(hr_dev, &hr_cq->db);
-		}
+		hr_dev->hw->destroy_cq(ib_cq, udata);
+		return;
+	}
+
+	hns_roce_free_cq(hr_dev, hr_cq);
+	hns_roce_mtt_cleanup(hr_dev, &hr_cq->hr_buf.hr_mtt);
 
-		kfree(hr_cq);
+	if (udata) {
+		ib_umem_release(hr_cq->umem);
+
+		if (hr_cq->db_en == 1)
+			hns_roce_db_unmap_user(rdma_udata_to_drv_context(
+						       udata,
+						       struct hns_roce_ucontext,
+						       ibucontext),
+					       &hr_cq->db);
+	} else {
+		/* Free the buff of stored cq */
+		hns_roce_ib_free_cq_buf(hr_dev, &hr_cq->hr_buf, ib_cq->cqe);
+		if (hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_RECORD_DB)
+			hns_roce_free_db(hr_dev, &hr_cq->db);
 	}
 
-	return ret;
+	kfree(hr_cq);
 }
 EXPORT_SYMBOL_GPL(hns_roce_ib_destroy_cq);
 

drivers/infiniband/hw/hns/hns_roce_device.h

@@ -938,7 +938,7 @@ struct hns_roce_hw {
 	int (*poll_cq)(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc);
 	int (*dereg_mr)(struct hns_roce_dev *hr_dev, struct hns_roce_mr *mr,
 			struct ib_udata *udata);
-	int (*destroy_cq)(struct ib_cq *ibcq, struct ib_udata *udata);
+	void (*destroy_cq)(struct ib_cq *ibcq, struct ib_udata *udata);
 	int (*modify_cq)(struct ib_cq *cq, u16 cq_count, u16 cq_period);
 	int (*init_eq)(struct hns_roce_dev *hr_dev);
 	void (*cleanup_eq)(struct hns_roce_dev *hr_dev);
@@ -1209,7 +1209,7 @@ struct ib_cq *hns_roce_ib_create_cq(struct ib_device *ib_dev,
 				    const struct ib_cq_init_attr *attr,
 				    struct ib_udata *udata);
 
-int hns_roce_ib_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata);
+void hns_roce_ib_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata);
 void hns_roce_free_cq(struct hns_roce_dev *hr_dev, struct hns_roce_cq *hr_cq);
 
 int hns_roce_db_map_user(struct hns_roce_ucontext *context,

drivers/infiniband/hw/hns/hns_roce_hw_v1.c

@@ -865,8 +865,7 @@ static int hns_roce_v1_rsv_lp_qp(struct hns_roce_dev *hr_dev)
 	kfree(pd);
 
 alloc_mem_failed:
-	if (hns_roce_ib_destroy_cq(cq, NULL))
-		dev_err(dev, "Destroy cq for create_lp_qp failed!\n");
+	hns_roce_ib_destroy_cq(cq, NULL);
 
 	return ret;
 }
@@ -894,10 +893,7 @@ static void hns_roce_v1_release_lp_qp(struct hns_roce_dev *hr_dev)
 				i, ret);
 	}
 
-	ret = hns_roce_ib_destroy_cq(&free_mr->mr_free_cq->ib_cq, NULL);
-	if (ret)
-		dev_err(dev, "Destroy cq for mr_free failed(%d)!\n", ret);
-
+	hns_roce_ib_destroy_cq(&free_mr->mr_free_cq->ib_cq, NULL);
 	hns_roce_dealloc_pd(&free_mr->mr_free_pd->ibpd, NULL);
 }
 
@@ -3654,7 +3650,7 @@ int hns_roce_v1_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata)
 	return 0;
 }
 
-static int hns_roce_v1_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata)
+static void hns_roce_v1_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata)
 {
 	struct hns_roce_dev *hr_dev = to_hr_dev(ibcq->device);
 	struct hns_roce_cq *hr_cq = to_hr_cq(ibcq);
@@ -3663,7 +3659,6 @@ static int hns_roce_v1_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata)
 	u32 cqe_cnt_cur;
 	u32 cq_buf_size;
 	int wait_time = 0;
-	int ret = 0;
 
 	hns_roce_free_cq(hr_dev, hr_cq);
 
@@ -3685,7 +3680,6 @@ static int hns_roce_v1_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata)
 		if (wait_time > HNS_ROCE_MAX_FREE_CQ_WAIT_CNT) {
 			dev_warn(dev, "Destroy cq 0x%lx timeout!\n",
 				hr_cq->cqn);
-			ret = -ETIMEDOUT;
 			break;
 		}
 		wait_time++;
@@ -3702,8 +3696,6 @@ static int hns_roce_v1_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata)
 	}
 
 	kfree(hr_cq);
-
-	return ret;
 }
 
 static void set_eq_cons_index_v1(struct hns_roce_eq *eq, int req_not)

drivers/infiniband/hw/i40iw/i40iw_verbs.c

@@ -1064,7 +1064,7 @@ void i40iw_cq_wq_destroy(struct i40iw_device *iwdev, struct i40iw_sc_cq *cq)
  * @ib_cq: cq pointer
  * @udata: user data or NULL for kernel object
  */
-static int i40iw_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
+static void i40iw_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
 {
 	struct i40iw_cq *iwcq;
 	struct i40iw_device *iwdev;
@@ -1077,7 +1077,6 @@ static int i40iw_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
 	cq_free_resources(iwdev, iwcq);
 	kfree(iwcq);
 	i40iw_rem_devusecount(iwdev);
-	return 0;
 }
 
 /**

drivers/infiniband/hw/mlx4/cq.c

@@ -486,7 +486,7 @@ int mlx4_ib_resize_cq(struct ib_cq *ibcq, int entries, struct ib_udata *udata)
 	return err;
 }
 
-int mlx4_ib_destroy_cq(struct ib_cq *cq, struct ib_udata *udata)
+void mlx4_ib_destroy_cq(struct ib_cq *cq, struct ib_udata *udata)
 {
 	struct mlx4_ib_dev *dev = to_mdev(cq->device);
 	struct mlx4_ib_cq *mcq = to_mcq(cq);
@@ -508,8 +508,6 @@ int mlx4_ib_destroy_cq(struct ib_cq *cq, struct ib_udata *udata)
 	}
 
 	kfree(mcq);
-
-	return 0;
 }
 
 static void dump_cqe(void *cqe)

drivers/infiniband/hw/mlx4/mlx4_ib.h

@@ -746,7 +746,7 @@ int mlx4_ib_resize_cq(struct ib_cq *ibcq, int entries, struct ib_udata *udata);
 struct ib_cq *mlx4_ib_create_cq(struct ib_device *ibdev,
 				const struct ib_cq_init_attr *attr,
 				struct ib_udata *udata);
-int mlx4_ib_destroy_cq(struct ib_cq *cq, struct ib_udata *udata);
+void mlx4_ib_destroy_cq(struct ib_cq *cq, struct ib_udata *udata);
 int mlx4_ib_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc);
 int mlx4_ib_arm_cq(struct ib_cq *cq, enum ib_cq_notify_flags flags);
 void __mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq);