RDMA/odp: Provide ib_umem_odp_release() to undo the allocs

Now that there are allocator APIs that return the ib_umem_odp directly
it should be freed through a umem_odp free'er as well.

Link: https://lore.kernel.org/r/20190819111710.18440-8-leon@kernel.orgSigned-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/core/umem.c

@@ -326,15 +326,6 @@ struct ib_umem *ib_umem_get(struct ib_udata *udata, unsigned long addr,
 }
 EXPORT_SYMBOL(ib_umem_get);
 
-static void __ib_umem_release_tail(struct ib_umem *umem)
-{
-	mmdrop(umem->owning_mm);
-	if (umem->is_odp)
-		kfree(to_ib_umem_odp(umem));
-	else
-		kfree(umem);
-}
-
 /**
  * ib_umem_release - release memory pinned with ib_umem_get
  * @umem: umem struct to release
@@ -343,17 +334,14 @@ 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);
-		return;
-	}
+	if (umem->is_odp)
+		return ib_umem_odp_release(to_ib_umem_odp(umem));
 
 	__ib_umem_release(umem->context->device, umem, 1);
 
 	atomic64_sub(ib_umem_num_pages(umem), &umem->owning_mm->pinned_vm);
-	__ib_umem_release_tail(umem);
+	mmdrop(umem->owning_mm);
+	kfree(umem);
 }
 EXPORT_SYMBOL(ib_umem_release);
 

drivers/infiniband/core/umem_odp.c

@@ -523,7 +523,10 @@ void ib_umem_odp_release(struct ib_umem_odp *umem_odp)
 		vfree(umem_odp->page_list);
 	}
 	put_per_mm(umem_odp);
+	mmdrop(umem_odp->umem.owning_mm);
+	kfree(umem_odp);
 }
+EXPORT_SYMBOL(ib_umem_odp_release);
 
 /*
  * Map for DMA and insert a single page into the on-demand paging page tables.

drivers/infiniband/hw/mlx5/mr.c

@@ -1629,7 +1629,7 @@ static void dereg_mr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr)
 		 * so that there will not be any invalidations in
 		 * flight, looking at the *mr struct.
 		 */
-		ib_umem_release(umem);
+		ib_umem_odp_release(umem_odp);
 		atomic_sub(npages, &dev->mdev->priv.reg_pages);
 
 		/* Avoid double-freeing the umem. */

drivers/infiniband/hw/mlx5/odp.c

@@ -206,7 +206,7 @@ static void mr_leaf_free_action(struct work_struct *work)
 	mr->parent = NULL;
 	synchronize_srcu(&mr->dev->mr_srcu);
 
-	ib_umem_release(&odp->umem);
+	ib_umem_odp_release(odp);
 	if (imr->live)
 		mlx5_ib_update_xlt(imr, idx, 1, 0,
 				   MLX5_IB_UPD_XLT_INDIRECT |
@@ -472,7 +472,7 @@ static struct ib_umem_odp *implicit_mr_get_data(struct mlx5_ib_mr *mr,
 					mr->access_flags);
 		if (IS_ERR(mtt)) {
 			mutex_unlock(&odp_mr->umem_mutex);
-			ib_umem_release(&odp->umem);
+			ib_umem_odp_release(odp);
 			return ERR_CAST(mtt);
 		}
 
@@ -526,7 +526,7 @@ struct mlx5_ib_mr *mlx5_ib_alloc_implicit_mr(struct mlx5_ib_pd *pd,
 
 	imr = implicit_mr_alloc(&pd->ibpd, umem_odp, 1, access_flags);
 	if (IS_ERR(imr)) {
-		ib_umem_release(&umem_odp->umem);
+		ib_umem_odp_release(umem_odp);
 		return ERR_CAST(imr);
 	}