RDMA: Check umem pointer validity prior to release

Update ib_umem_release() to behave similarly to kfree() and allow
submitting NULL pointer as safe input to this function.

Fixes: a52c8e2469c3 ("RDMA: Clean destroy CQ in drivers do not return errors")
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

26 files changed, 73 insertions, 132 deletions

diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index 54628ef879f0..08da840ed7ee 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -361,6 +361,9 @@ static void __ib_umem_release_tail(struct ib_umem *umem)
  */
 void ib_umem_release(struct ib_umem *umem)
 {
+        if (!umem)
+                return;
+
         if (umem->is_odp) {
                 ib_umem_odp_release(to_ib_umem_odp(umem));
                 __ib_umem_release_tail(umem);
diff --git a/drivers/infiniband/hw/bnxt_re/ib_verbs.c b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
index 44cc5f19df3b..a91653aabf38 100644
--- a/drivers/infiniband/hw/bnxt_re/ib_verbs.c
+++ b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
@@ -805,10 +805,8 @@ int bnxt_re_destroy_qp(struct ib_qp *ib_qp, struct ib_udata *udata)
                 rdev->sqp_ah = NULL;
         }
 
-        if (!IS_ERR_OR_NULL(qp->rumem))
-                ib_umem_release(qp->rumem);
-        if (!IS_ERR_OR_NULL(qp->sumem))
-                ib_umem_release(qp->sumem);
+        ib_umem_release(qp->rumem);
+        ib_umem_release(qp->sumem);
 
         mutex_lock(&rdev->qp_lock);
         list_del(&qp->list);
@@ -1201,12 +1199,8 @@ struct ib_qp *bnxt_re_create_qp(struct ib_pd *ib_pd,
 qp_destroy:
         bnxt_qplib_destroy_qp(&rdev->qplib_res, &qp->qplib_qp);
 free_umem:
-        if (udata) {
-                if (qp->rumem)
-                        ib_umem_release(qp->rumem);
-                if (qp->sumem)
-                        ib_umem_release(qp->sumem);
-        }
+        ib_umem_release(qp->rumem);
+        ib_umem_release(qp->sumem);
 fail:
         kfree(qp);
         return ERR_PTR(rc);
@@ -1302,8 +1296,7 @@ void bnxt_re_destroy_srq(struct ib_srq *ib_srq, struct ib_udata *udata)
         if (qplib_srq->cq)
                 nq = qplib_srq->cq->nq;
         bnxt_qplib_destroy_srq(&rdev->qplib_res, qplib_srq);
-        if (srq->umem)
-                ib_umem_release(srq->umem);
+        ib_umem_release(srq->umem);
         atomic_dec(&rdev->srq_count);
         if (nq)
                 nq->budget--;
@@ -1412,8 +1405,7 @@ int bnxt_re_create_srq(struct ib_srq *ib_srq,
         return 0;
 
 fail:
-        if (srq->umem)
-                ib_umem_release(srq->umem);
+        ib_umem_release(srq->umem);
 exit:
         return rc;
 }
@@ -2528,8 +2520,7 @@ void bnxt_re_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
         nq = cq->qplib_cq.nq;
 
         bnxt_qplib_destroy_cq(&rdev->qplib_res, &cq->qplib_cq);
-        if (!cq->umem)
-                ib_umem_release(cq->umem);
+        ib_umem_release(cq->umem);
 
         atomic_dec(&rdev->cq_count);
         nq->budget--;
@@ -2632,8 +2623,7 @@ int bnxt_re_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
         return 0;
 
 c2fail:
-        if (udata)
-                ib_umem_release(cq->umem);
+        ib_umem_release(cq->umem);
 fail:
         kfree(cq->cql);
         return rc;
@@ -3340,8 +3330,7 @@ int bnxt_re_dereg_mr(struct ib_mr *ib_mr, struct ib_udata *udata)
                 mr->npages = 0;
                 mr->pages = NULL;
         }
-        if (!IS_ERR_OR_NULL(mr->ib_umem))
-                ib_umem_release(mr->ib_umem);
+        ib_umem_release(mr->ib_umem);
 
         kfree(mr);
         atomic_dec(&rdev->mr_count);
diff --git a/drivers/infiniband/hw/cxgb3/iwch_provider.c b/drivers/infiniband/hw/cxgb3/iwch_provider.c
index 810fa96af2e9..e775c1a1a450 100644
--- a/drivers/infiniband/hw/cxgb3/iwch_provider.c
+++ b/drivers/infiniband/hw/cxgb3/iwch_provider.c
@@ -346,8 +346,7 @@ static int iwch_dereg_mr(struct ib_mr *ib_mr, struct ib_udata *udata)
         xa_erase_irq(&rhp->mrs, mmid);
         if (mhp->kva)
                 kfree((void *) (unsigned long) mhp->kva);
-        if (mhp->umem)
-                ib_umem_release(mhp->umem);
+        ib_umem_release(mhp->umem);
         pr_debug("%s mmid 0x%x ptr %p\n", __func__, mmid, mhp);
         kfree(mhp);
         return 0;
diff --git a/drivers/infiniband/hw/cxgb4/mem.c b/drivers/infiniband/hw/cxgb4/mem.c
index fe3733c4026d..aa772ee0706f 100644
--- a/drivers/infiniband/hw/cxgb4/mem.c
+++ b/drivers/infiniband/hw/cxgb4/mem.c
@@ -808,8 +808,7 @@ int c4iw_dereg_mr(struct ib_mr *ib_mr, struct ib_udata *udata)
                                   mhp->attr.pbl_size << 3);
         if (mhp->kva)
                 kfree((void *) (unsigned long) mhp->kva);
-        if (mhp->umem)
-                ib_umem_release(mhp->umem);
+        ib_umem_release(mhp->umem);
         pr_debug("mmid 0x%x ptr %p\n", mmid, mhp);
         c4iw_put_wr_wait(mhp->wr_waitp);
         kfree(mhp);
diff --git a/drivers/infiniband/hw/efa/efa_verbs.c b/drivers/infiniband/hw/efa/efa_verbs.c
index a9372c9e4b30..5e6e5eb65cff 100644
--- a/drivers/infiniband/hw/efa/efa_verbs.c
+++ b/drivers/infiniband/hw/efa/efa_verbs.c
@@ -1513,8 +1513,8 @@ int efa_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
                 err = efa_com_dereg_mr(&dev->edev, &params);
                 if (err)
                         return err;
-                ib_umem_release(mr->umem);
         }
+        ib_umem_release(mr->umem);
 
         kfree(mr);
 
diff --git a/drivers/infiniband/hw/hns/hns_roce_cq.c b/drivers/infiniband/hw/hns/hns_roce_cq.c
index 7e198c9ffbfe..6b4d8e50aabe 100644
--- a/drivers/infiniband/hw/hns/hns_roce_cq.c
+++ b/drivers/infiniband/hw/hns/hns_roce_cq.c
@@ -423,9 +423,8 @@ err_dbmap:
 
 err_mtt:
         hns_roce_mtt_cleanup(hr_dev, &hr_cq->hr_buf.hr_mtt);
-        if (udata)
-                ib_umem_release(hr_cq->umem);
-        else
+        ib_umem_release(hr_cq->umem);
+        if (!udata)
                 hns_roce_ib_free_cq_buf(hr_dev, &hr_cq->hr_buf,
                                         hr_cq->ib_cq.cqe);
 
@@ -451,9 +450,8 @@ void hns_roce_ib_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
         hns_roce_free_cq(hr_dev, hr_cq);
         hns_roce_mtt_cleanup(hr_dev, &hr_cq->hr_buf.hr_mtt);
 
+        ib_umem_release(hr_cq->umem);
         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,
diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
index c899879da222..cb004190ccba 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
@@ -1163,8 +1163,7 @@ free_mr:
         hns_roce_bitmap_free(&hr_dev->mr_table.mtpt_bitmap,
                              key_to_hw_index(mr->key), 0);
 
-        if (mr->umem)
-                ib_umem_release(mr->umem);
+        ib_umem_release(mr->umem);
 
         kfree(mr);
 
@@ -3641,9 +3640,8 @@ int hns_roce_v1_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata)
 
         hns_roce_mtt_cleanup(hr_dev, &hr_qp->mtt);
 
-        if (udata)
-                ib_umem_release(hr_qp->umem);
-        else {
+        ib_umem_release(hr_qp->umem);
+        if (!udata) {
                 kfree(hr_qp->sq.wrid);
                 kfree(hr_qp->rq.wrid);
 
@@ -3694,9 +3692,8 @@ static void hns_roce_v1_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata)
 
         hns_roce_mtt_cleanup(hr_dev, &hr_cq->hr_buf.hr_mtt);
 
-        if (ibcq->uobject)
-                ib_umem_release(hr_cq->umem);
-        else {
+        ib_umem_release(hr_cq->umem);
+        if (!udata) {
                 /* Free the buff of stored cq */
                 cq_buf_size = (ibcq->cqe + 1) * hr_dev->caps.cq_entry_sz;
                 hns_roce_buf_free(hr_dev, cq_buf_size, &hr_cq->hr_buf.hr_buf);
diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index 5c8551b54444..edd62b4dc0a0 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -4582,7 +4582,6 @@ static int hns_roce_v2_destroy_qp_common(struct hns_roce_dev *hr_dev,
 
                 if (hr_qp->rq.wqe_cnt && (hr_qp->rdb_en == 1))
                         hns_roce_db_unmap_user(context, &hr_qp->rdb);
-                ib_umem_release(hr_qp->umem);
         } else {
                 kfree(hr_qp->sq.wrid);
                 kfree(hr_qp->rq.wrid);
@@ -4590,6 +4589,7 @@ static int hns_roce_v2_destroy_qp_common(struct hns_roce_dev *hr_dev,
                 if (hr_qp->rq.wqe_cnt)
                         hns_roce_free_db(hr_dev, &hr_qp->rdb);
         }
+        ib_umem_release(hr_qp->umem);
 
         if ((hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_RQ_INLINE) &&
              hr_qp->rq.wqe_cnt) {
diff --git a/drivers/infiniband/hw/hns/hns_roce_mr.c b/drivers/infiniband/hw/hns/hns_roce_mr.c
index 6db0dae18ab7..adf075183dfb 100644
--- a/drivers/infiniband/hw/hns/hns_roce_mr.c
+++ b/drivers/infiniband/hw/hns/hns_roce_mr.c
@@ -1298,9 +1298,7 @@ int hns_roce_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
         } else {
                 hns_roce_mr_free(hr_dev, mr);
 
-                if (mr->umem)
-                        ib_umem_release(mr->umem);
-
+                ib_umem_release(mr->umem);
                 kfree(mr);
         }
 
diff --git a/drivers/infiniband/hw/hns/hns_roce_qp.c b/drivers/infiniband/hw/hns/hns_roce_qp.c
index 99ec5d43b99b..7e9db8236072 100644
--- a/drivers/infiniband/hw/hns/hns_roce_qp.c
+++ b/drivers/infiniband/hw/hns/hns_roce_qp.c
@@ -938,10 +938,9 @@ err_get_bufs:
         hns_roce_free_buf_list(buf_list, hr_qp->region_cnt);
 
 err_alloc_list:
-        if (hr_qp->umem)
-                ib_umem_release(hr_qp->umem);
-        else
+        if (!hr_qp->umem)
                 hns_roce_buf_free(hr_dev, hr_qp->buff_size, &hr_qp->hr_buf);
+        ib_umem_release(hr_qp->umem);
 
 err_db:
         if (!udata && hns_roce_qp_has_rq(init_attr) &&
diff --git a/drivers/infiniband/hw/hns/hns_roce_srq.c b/drivers/infiniband/hw/hns/hns_roce_srq.c
index c222f243953a..de645be8aa48 100644
--- a/drivers/infiniband/hw/hns/hns_roce_srq.c
+++ b/drivers/infiniband/hw/hns/hns_roce_srq.c
@@ -380,8 +380,7 @@ err_idx_buf:
         hns_roce_mtt_cleanup(hr_dev, &srq->idx_que.mtt);
 
 err_idx_mtt:
-        if (udata)
-                ib_umem_release(srq->idx_que.umem);
+        ib_umem_release(srq->idx_que.umem);
 
 err_create_idx:
         hns_roce_buf_free(hr_dev, srq->idx_que.buf_size,
@@ -392,9 +391,8 @@ err_srq_mtt:
         hns_roce_mtt_cleanup(hr_dev, &srq->mtt);
 
 err_buf:
-        if (udata)
-                ib_umem_release(srq->umem);
-        else
+        ib_umem_release(srq->umem);
+        if (!udata)
                 hns_roce_buf_free(hr_dev, srq_buf_size, &srq->buf);
 
         return ret;
@@ -408,15 +406,15 @@ void hns_roce_destroy_srq(struct ib_srq *ibsrq, struct ib_udata *udata)
         hns_roce_srq_free(hr_dev, srq);
         hns_roce_mtt_cleanup(hr_dev, &srq->mtt);
 
-        if (ibsrq->uobject) {
+        if (udata) {
                 hns_roce_mtt_cleanup(hr_dev, &srq->idx_que.mtt);
-                ib_umem_release(srq->idx_que.umem);
-                ib_umem_release(srq->umem);
         } else {
                 kvfree(srq->wrid);
                 hns_roce_buf_free(hr_dev, srq->max << srq->wqe_shift,
                                   &srq->buf);
         }
+        ib_umem_release(srq->idx_que.umem);
+        ib_umem_release(srq->umem);
 }
 
 int hns_roce_init_srq_table(struct hns_roce_dev *hr_dev)
diff --git a/drivers/infiniband/hw/i40iw/i40iw_verbs.c b/drivers/infiniband/hw/i40iw/i40iw_verbs.c
index 3100b0c31b0a..3c0c6aabc64e 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_verbs.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_verbs.c
@@ -2004,8 +2004,7 @@ static int i40iw_dereg_mr(struct ib_mr *ib_mr, struct ib_udata *udata)
         struct cqp_commands_info *cqp_info;
         u32 stag_idx;
 
-        if (iwmr->region)
-                ib_umem_release(iwmr->region);
+        ib_umem_release(iwmr->region);
 
         if (iwmr->type != IW_MEMREG_TYPE_MEM) {
                 /* region is released. only test for userness. */
diff --git a/drivers/infiniband/hw/mlx4/cq.c b/drivers/infiniband/hw/mlx4/cq.c
index 72f238ddafb5..a7d238d312f0 100644
--- a/drivers/infiniband/hw/mlx4/cq.c
+++ b/drivers/infiniband/hw/mlx4/cq.c
@@ -277,9 +277,8 @@ err_dbmap:
 err_mtt:
         mlx4_mtt_cleanup(dev->dev, &cq->buf.mtt);
 
-        if (udata)
-                ib_umem_release(cq->umem);
-        else
+        ib_umem_release(cq->umem);
+        if (!udata)
                 mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
 
 err_db:
@@ -468,11 +467,8 @@ err_buf:
         kfree(cq->resize_buf);
         cq->resize_buf = NULL;
 
-        if (cq->resize_umem) {
-                ib_umem_release(cq->resize_umem);
-                cq->resize_umem = NULL;
-        }
-
+        ib_umem_release(cq->resize_umem);
+        cq->resize_umem = NULL;
 out:
         mutex_unlock(&cq->resize_mutex);
 
@@ -494,11 +490,11 @@ void mlx4_ib_destroy_cq(struct ib_cq *cq, struct ib_udata *udata)
                                 struct mlx4_ib_ucontext,
                                 ibucontext),
                         &mcq->db);
-                ib_umem_release(mcq->umem);
         } else {
                 mlx4_ib_free_cq_buf(dev, &mcq->buf, cq->cqe);
                 mlx4_db_free(dev->dev, &mcq->db);
         }
+        ib_umem_release(mcq->umem);
 }
 
 static void dump_cqe(void *cqe)
diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index 520364defa28..82aff2f2fdc2 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -1207,10 +1207,9 @@ err_mtt:
         mlx4_mtt_cleanup(dev->dev, &qp->mtt);
 
 err_buf:
-        if (qp->umem)
-                ib_umem_release(qp->umem);
-        else
+        if (!qp->umem)
                 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf);
+        ib_umem_release(qp->umem);
 
 err_db:
         if (!udata && qp_has_rq(init_attr))
@@ -1421,7 +1420,6 @@ static void destroy_qp_common(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp,
 
                         mlx4_ib_db_unmap_user(mcontext, &qp->db);
                 }
-                ib_umem_release(qp->umem);
         } else {
                 kvfree(qp->sq.wrid);
                 kvfree(qp->rq.wrid);
@@ -1432,6 +1430,7 @@ static void destroy_qp_common(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp,
                 if (qp->rq.wqe_cnt)
                         mlx4_db_free(dev->dev, &qp->db);
         }
+        ib_umem_release(qp->umem);
 
         del_gid_entries(qp);
 }
diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index c9f555e04c9f..848db7264cc9 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -204,10 +204,9 @@ err_mtt:
         mlx4_mtt_cleanup(dev->dev, &srq->mtt);
 
 err_buf:
-        if (srq->umem)
-                ib_umem_release(srq->umem);
-        else
+        if (!srq->umem)
                 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
+        ib_umem_release(srq->umem);
 
 err_db:
         if (!udata)
@@ -275,13 +274,13 @@ void mlx4_ib_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
                                 struct mlx4_ib_ucontext,
                                 ibucontext),
                         &msrq->db);
-                ib_umem_release(msrq->umem);
         } else {
                 kvfree(msrq->wrid);
                 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
                               &msrq->buf);
                 mlx4_db_free(dev->dev, &msrq->db);
         }
+        ib_umem_release(msrq->umem);
 }
 
 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
diff --git a/drivers/infiniband/hw/mlx5/cq.c b/drivers/infiniband/hw/mlx5/cq.c
index 07b73df0e1a3..22230fd7d741 100644
--- a/drivers/infiniband/hw/mlx5/cq.c
+++ b/drivers/infiniband/hw/mlx5/cq.c
@@ -1125,11 +1125,6 @@ static int resize_user(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq,
         return 0;
 }
 
-static void un_resize_user(struct mlx5_ib_cq *cq)
-{
-        ib_umem_release(cq->resize_umem);
-}
-
 static int resize_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq,
                          int entries, int cqe_size)
 {
@@ -1152,12 +1147,6 @@ ex:
         return err;
 }
 
-static void un_resize_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq)
-{
-        free_cq_buf(dev, cq->resize_buf);
-        cq->resize_buf = NULL;
-}
-
 static int copy_resize_cqes(struct mlx5_ib_cq *cq)
 {
         struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device);
@@ -1338,10 +1327,11 @@ ex_alloc:
         kvfree(in);
 
 ex_resize:
-        if (udata)
-                un_resize_user(cq);
-        else
-                un_resize_kernel(dev, cq);
+        ib_umem_release(cq->resize_umem);
+        if (!udata) {
+                free_cq_buf(dev, cq->resize_buf);
+                cq->resize_buf = NULL;
+        }
 ex:
         mutex_unlock(&cq->resize_mutex);
         return err;
diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index 4d033796dcfc..994abcebb057 100644
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -1507,10 +1507,9 @@ int mlx5_ib_rereg_user_mr(struct ib_mr *ib_mr, int flags, u64 start,
         return 0;
 
 err:
-        if (mr->umem) {
-                ib_umem_release(mr->umem);
-                mr->umem = NULL;
-        }
+        ib_umem_release(mr->umem);
+        mr->umem = NULL;
+
         clean_mr(dev, mr);
         return err;
 }
@@ -1630,10 +1629,10 @@ static void dereg_mr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr)
          * remove the DMA mapping.
          */
         mlx5_mr_cache_free(dev, mr);
-        if (umem) {
-                ib_umem_release(umem);
+        ib_umem_release(umem);
+        if (umem)
                 atomic_sub(npages, &dev->mdev->priv.reg_pages);
-        }
+
         if (!mr->allocated_from_cache)
                 kfree(mr);
 }
diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c
index ae847709b3d3..12ccbd584d2a 100644
--- a/drivers/infiniband/hw/mlx5/qp.c
+++ b/drivers/infiniband/hw/mlx5/qp.c
@@ -790,8 +790,7 @@ static void destroy_user_rq(struct mlx5_ib_dev *dev, struct ib_pd *pd,
                 atomic_dec(&dev->delay_drop.rqs_cnt);
 
         mlx5_ib_db_unmap_user(context, &rwq->db);
-        if (rwq->umem)
-                ib_umem_release(rwq->umem);
+        ib_umem_release(rwq->umem);
 }
 
 static int create_user_rq(struct mlx5_ib_dev *dev, struct ib_pd *pd,
@@ -977,8 +976,7 @@ err_free:
         kvfree(*in);
 
 err_umem:
-        if (ubuffer->umem)
-                ib_umem_release(ubuffer->umem);
+        ib_umem_release(ubuffer->umem);
 
 err_bfreg:
         if (bfregn != MLX5_IB_INVALID_BFREG)
@@ -997,8 +995,7 @@ static void destroy_qp_user(struct mlx5_ib_dev *dev, struct ib_pd *pd,
                         ibucontext);
 
         mlx5_ib_db_unmap_user(context, &qp->db);
-        if (base->ubuffer.umem)
-                ib_umem_release(base->ubuffer.umem);
+        ib_umem_release(base->ubuffer.umem);
 
         /*
          * Free only the BFREGs which are handled by the kernel.
diff --git a/drivers/infiniband/hw/mthca/mthca_provider.c b/drivers/infiniband/hw/mthca/mthca_provider.c
index d97124bee703..23554d8bf241 100644
--- a/drivers/infiniband/hw/mthca/mthca_provider.c
+++ b/drivers/infiniband/hw/mthca/mthca_provider.c
@@ -953,8 +953,7 @@ static int mthca_dereg_mr(struct ib_mr *mr, struct ib_udata *udata)
         struct mthca_mr *mmr = to_mmr(mr);
 
         mthca_free_mr(to_mdev(mr->device), mmr);
-        if (mmr->umem)
-                ib_umem_release(mmr->umem);
+        ib_umem_release(mmr->umem);
         kfree(mmr);
 
         return 0;
diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
index 10b35edb286b..bccc11378109 100644
--- a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
+++ b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
@@ -925,8 +925,7 @@ int ocrdma_dereg_mr(struct ib_mr *ib_mr, struct ib_udata *udata)
         ocrdma_free_mr_pbl_tbl(dev, &mr->hwmr);
 
         /* it could be user registered memory. */
-        if (mr->umem)
-                ib_umem_release(mr->umem);
+        ib_umem_release(mr->umem);
         kfree(mr);
 
         /* Don't stop cleanup, in case FW is unresponsive */
diff --git a/drivers/infiniband/hw/qedr/verbs.c b/drivers/infiniband/hw/qedr/verbs.c
index 3fc7a4e901c3..27d90a84ea01 100644
--- a/drivers/infiniband/hw/qedr/verbs.c
+++ b/drivers/infiniband/hw/qedr/verbs.c
@@ -1572,12 +1572,10 @@ qedr_iwarp_populate_user_qp(struct qedr_dev *dev,
 
 static void qedr_cleanup_user(struct qedr_dev *dev, struct qedr_qp *qp)
 {
-        if (qp->usq.umem)
-                ib_umem_release(qp->usq.umem);
+        ib_umem_release(qp->usq.umem);
         qp->usq.umem = NULL;
 
-        if (qp->urq.umem)
-                ib_umem_release(qp->urq.umem);
+        ib_umem_release(qp->urq.umem);
         qp->urq.umem = NULL;
 }
 
@@ -2680,8 +2678,7 @@ int qedr_dereg_mr(struct ib_mr *ib_mr, struct ib_udata *udata)
                 qedr_free_pbl(dev, &mr->info.pbl_info, mr->info.pbl_table);
 
         /* it could be user registered memory. */
-        if (mr->umem)
-                ib_umem_release(mr->umem);
+        ib_umem_release(mr->umem);
 
         kfree(mr);
 
diff --git a/drivers/infiniband/hw/vmw_pvrdma/pvrdma_cq.c b/drivers/infiniband/hw/vmw_pvrdma/pvrdma_cq.c
index 38573fc0a9bf..7800e6930502 100644
--- a/drivers/infiniband/hw/vmw_pvrdma/pvrdma_cq.c
+++ b/drivers/infiniband/hw/vmw_pvrdma/pvrdma_cq.c
@@ -213,8 +213,7 @@ int pvrdma_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
 err_page_dir:
         pvrdma_page_dir_cleanup(dev, &cq->pdir);
 err_umem:
-        if (!cq->is_kernel)
-                ib_umem_release(cq->umem);
+        ib_umem_release(cq->umem);
 err_cq:
         atomic_dec(&dev->num_cqs);
         return ret;
@@ -226,8 +225,7 @@ static void pvrdma_free_cq(struct pvrdma_dev *dev, struct pvrdma_cq *cq)
                 complete(&cq->free);
         wait_for_completion(&cq->free);
 
-        if (!cq->is_kernel)
-                ib_umem_release(cq->umem);
+        ib_umem_release(cq->umem);
 
         pvrdma_page_dir_cleanup(dev, &cq->pdir);
 }
diff --git a/drivers/infiniband/hw/vmw_pvrdma/pvrdma_mr.c b/drivers/infiniband/hw/vmw_pvrdma/pvrdma_mr.c
index 65dc47ffb8f3..f3a3d22ee8d7 100644
--- a/drivers/infiniband/hw/vmw_pvrdma/pvrdma_mr.c
+++ b/drivers/infiniband/hw/vmw_pvrdma/pvrdma_mr.c
@@ -290,8 +290,7 @@ int pvrdma_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
                          "could not deregister mem region, error: %d\n", ret);
 
         pvrdma_page_dir_cleanup(dev, &mr->pdir);
-        if (mr->umem)
-                ib_umem_release(mr->umem);
+        ib_umem_release(mr->umem);
 
         kfree(mr->pages);
         kfree(mr);
diff --git a/drivers/infiniband/hw/vmw_pvrdma/pvrdma_qp.c b/drivers/infiniband/hw/vmw_pvrdma/pvrdma_qp.c
index 0eaaead5baec..bca6a58a442e 100644
--- a/drivers/infiniband/hw/vmw_pvrdma/pvrdma_qp.c
+++ b/drivers/infiniband/hw/vmw_pvrdma/pvrdma_qp.c
@@ -391,12 +391,8 @@ struct ib_qp *pvrdma_create_qp(struct ib_pd *pd,
 err_pdir:
         pvrdma_page_dir_cleanup(dev, &qp->pdir);
 err_umem:
-        if (!qp->is_kernel) {
-                if (qp->rumem)
-                        ib_umem_release(qp->rumem);
-                if (qp->sumem)
-                        ib_umem_release(qp->sumem);
-        }
+        ib_umem_release(qp->rumem);
+        ib_umem_release(qp->sumem);
 err_qp:
         kfree(qp);
         atomic_dec(&dev->num_qps);
@@ -429,12 +425,8 @@ static void pvrdma_free_qp(struct pvrdma_qp *qp)
                 complete(&qp->free);
         wait_for_completion(&qp->free);
 
-        if (!qp->is_kernel) {
-                if (qp->rumem)
-                        ib_umem_release(qp->rumem);
-                if (qp->sumem)
-                        ib_umem_release(qp->sumem);
-        }
+        ib_umem_release(qp->rumem);
+        ib_umem_release(qp->sumem);
 
         pvrdma_page_dir_cleanup(dev, &qp->pdir);
 
diff --git a/drivers/infiniband/sw/rdmavt/mr.c b/drivers/infiniband/sw/rdmavt/mr.c
index 54f3f9c27552..db800eb2b1f5 100644
--- a/drivers/infiniband/sw/rdmavt/mr.c
+++ b/drivers/infiniband/sw/rdmavt/mr.c
@@ -560,8 +560,7 @@ int rvt_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
         if (ret)
                 goto out;
         rvt_deinit_mregion(&mr->mr);
-        if (mr->umem)
-                ib_umem_release(mr->umem);
+        ib_umem_release(mr->umem);
         kfree(mr);
 out:
         return ret;
diff --git a/drivers/infiniband/sw/rxe/rxe_mr.c b/drivers/infiniband/sw/rxe/rxe_mr.c
index f501f72489d8..ea6a819b7167 100644
--- a/drivers/infiniband/sw/rxe/rxe_mr.c
+++ b/drivers/infiniband/sw/rxe/rxe_mr.c
@@ -96,8 +96,7 @@ void rxe_mem_cleanup(struct rxe_pool_entry *arg)
         struct rxe_mem *mem = container_of(arg, typeof(*mem), pelem);
         int i;
 
-        if (mem->umem)
-                ib_umem_release(mem->umem);
+        ib_umem_release(mem->umem);
 
         if (mem->map) {
                 for (i = 0; i < mem->num_map; i++)