IB/uverbs: Remove struct uverbs_root_spec and all supporting code

Everything now uses the uverbs_uapi data structure.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

6 files changed, 2 insertions, 742 deletions

diff --git a/drivers/infiniband/core/Makefile b/drivers/infiniband/core/Makefile
index d934cf617841..867cee5e27b2 100644
--- a/drivers/infiniband/core/Makefile
+++ b/drivers/infiniband/core/Makefile
@@ -35,7 +35,7 @@ ib_ucm-y :=			ucm.o
 
 ib_uverbs-y :=			uverbs_main.o uverbs_cmd.o uverbs_marshall.o \
 				rdma_core.o uverbs_std_types.o uverbs_ioctl.o \
-				uverbs_ioctl_merge.o uverbs_std_types_cq.o \
+				uverbs_std_types_cq.o \
 				uverbs_std_types_flow_action.o uverbs_std_types_dm.o \
 				uverbs_std_types_mr.o uverbs_std_types_counters.o \
 				uverbs_uapi.o
diff --git a/drivers/infiniband/core/rdma_core.c b/drivers/infiniband/core/rdma_core.c
index 2814228ead39..12e7c6c102c1 100644
--- a/drivers/infiniband/core/rdma_core.c
+++ b/drivers/infiniband/core/rdma_core.c
@@ -42,51 +42,6 @@
 #include "core_priv.h"
 #include "rdma_core.h"
 
-int uverbs_ns_idx(u16 *id, unsigned int ns_count)
-{
-	int ret = (*id & UVERBS_ID_NS_MASK) >> UVERBS_ID_NS_SHIFT;
-
-	if (ret >= ns_count)
-		return -EINVAL;
-
-	*id &= ~UVERBS_ID_NS_MASK;
-	return ret;
-}
-
-const struct uverbs_object_spec *uverbs_get_object(struct ib_uverbs_file *ufile,
-						   uint16_t object)
-{
-	const struct uverbs_root_spec *object_hash = ufile->device->specs_root;
-	const struct uverbs_object_spec_hash *objects;
-	int ret = uverbs_ns_idx(&object, object_hash->num_buckets);
-
-	if (ret < 0)
-		return NULL;
-
-	objects = object_hash->object_buckets[ret];
-
-	if (object >= objects->num_objects)
-		return NULL;
-
-	return objects->objects[object];
-}
-
-const struct uverbs_method_spec *uverbs_get_method(const struct uverbs_object_spec *object,
-						   uint16_t method)
-{
-	const struct uverbs_method_spec_hash *methods;
-	int ret = uverbs_ns_idx(&method, object->num_buckets);
-
-	if (ret < 0)
-		return NULL;
-
-	methods = object->method_buckets[ret];
-	if (method >= methods->num_methods)
-		return NULL;
-
-	return methods->methods[method];
-}
-
 void uverbs_uobject_get(struct ib_uobject *uobject)
 {
 	kref_get(&uobject->ref);
diff --git a/drivers/infiniband/core/rdma_core.h b/drivers/infiniband/core/rdma_core.h
index aca279bfef08..f962f2a593ba 100644
--- a/drivers/infiniband/core/rdma_core.h
+++ b/drivers/infiniband/core/rdma_core.h
@@ -45,12 +45,6 @@
 
 struct ib_uverbs_device;
 
-int uverbs_ns_idx(u16 *id, unsigned int ns_count);
-const struct uverbs_object_spec *uverbs_get_object(struct ib_uverbs_file *ufile,
-						   uint16_t object);
-const struct uverbs_method_spec *uverbs_get_method(const struct uverbs_object_spec *object,
-						   uint16_t method);
-
 void uverbs_destroy_ufile_hw(struct ib_uverbs_file *ufile,
 			     enum rdma_remove_reason reason);
 
diff --git a/drivers/infiniband/core/uverbs.h b/drivers/infiniband/core/uverbs.h
index 879be0d1fd99..5df8e548cc14 100644
--- a/drivers/infiniband/core/uverbs.h
+++ b/drivers/infiniband/core/uverbs.h
@@ -111,7 +111,6 @@ struct ib_uverbs_device {
 	struct mutex				lists_mutex; /* protect lists */
 	struct list_head			uverbs_file_list;
 	struct list_head			uverbs_events_file_list;
-	struct uverbs_root_spec			*specs_root;
 	struct uverbs_api			*uapi;
 };
 
diff --git a/drivers/infiniband/core/uverbs_ioctl_merge.c b/drivers/infiniband/core/uverbs_ioctl_merge.c
deleted file mode 100644
index 16b575929915..000000000000
--- a/drivers/infiniband/core/uverbs_ioctl_merge.c
+++ /dev/null
@@ -1,662 +0,0 @@
-/*
- * Copyright (c) 2017, Mellanox Technologies inc.  All rights reserved.
- *
- * This software is available to you under a choice of one of two
- * licenses.  You may choose to be licensed under the terms of the GNU
- * General Public License (GPL) Version 2, available from the file
- * COPYING in the main directory of this source tree, or the
- * OpenIB.org BSD license below:
- *
- *     Redistribution and use in source and binary forms, with or
- *     without modification, are permitted provided that the following
- *     conditions are met:
- *
- *      - Redistributions of source code must retain the above
- *        copyright notice, this list of conditions and the following
- *        disclaimer.
- *
- *      - Redistributions in binary form must reproduce the above
- *        copyright notice, this list of conditions and the following
- *        disclaimer in the documentation and/or other materials
- *        provided with the distribution.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-#include <rdma/uverbs_ioctl.h>
-#include <rdma/rdma_user_ioctl.h>
-#include <linux/bitops.h>
-#include "uverbs.h"
-
-#define UVERBS_NUM_NS (UVERBS_ID_NS_MASK >> UVERBS_ID_NS_SHIFT)
-#define GET_NS_ID(idx) (((idx) & UVERBS_ID_NS_MASK) >> UVERBS_ID_NS_SHIFT)
-#define GET_ID(idx) ((idx) & ~UVERBS_ID_NS_MASK)
-
-#define _for_each_element(elem, tmpi, tmpj, hashes, num_buckets_offset,	       \
-			  buckets_offset)				       \
-	for (tmpj = 0,							       \
-	     elem = (*(const void ***)((hashes)[tmpi] +			       \
-				       (buckets_offset)))[0];	               \
-	     tmpj < *(size_t *)((hashes)[tmpi] + (num_buckets_offset));        \
-	     tmpj++)						               \
-		if ((elem = ((*(const void ***)(hashes[tmpi] +		       \
-						(buckets_offset)))[tmpj])))
-
-/*
- * Iterate all elements of a few @hashes. The number of given hashes is
- * indicated by @num_hashes. The offset of the number of buckets in the hash is
- * represented by @num_buckets_offset, while the offset of the buckets array in
- * the hash structure is represented by @buckets_offset. tmpi and tmpj are two
- * short (or int) based indices that are given by the user. tmpi iterates over
- * the different hashes. @elem points the current element in the hashes[tmpi]
- * bucket we are looping on. To be honest, @hashes representation isn't exactly
- * a hash, but more a collection of elements. These elements' ids are treated
- * in a hash like manner, where the first upper bits are the bucket number.
- * These elements are later mapped into a perfect-hash.
- */
-#define for_each_element(elem, tmpi, tmpj, hashes, num_hashes,                 \
-			 num_buckets_offset, buckets_offset)		       \
-	for (tmpi = 0; tmpi < (num_hashes); tmpi++)		               \
-		_for_each_element(elem, tmpi, tmpj, hashes, num_buckets_offset,\
-				  buckets_offset)
-
-#define get_elements_iterators_entry_above(iters, num_elements, elements,     \
-					  num_objects_fld, objects_fld, bucket,\
-					  min_id)			       \
-	get_elements_above_id((const void **)iters, num_elements,       \
-				     (const void **)(elements),		       \
-				     offsetof(typeof(**elements),	       \
-					      num_objects_fld),		       \
-				     offsetof(typeof(**elements), objects_fld),\
-				     offsetof(typeof(***(*elements)->objects_fld), id),\
-				     bucket, min_id)
-
-#define get_objects_above_id(iters, num_trees, trees, bucket, min_id)	       \
-	get_elements_iterators_entry_above(iters, num_trees, trees,	       \
-					   num_objects, objects, bucket, min_id)
-
-#define get_methods_above_id(method_iters, num_iters, iters, bucket, min_id)\
-	get_elements_iterators_entry_above(method_iters, num_iters, iters,     \
-					   num_methods, methods, bucket, min_id)
-
-#define get_attrs_above_id(attrs_iters, num_iters, iters, bucket, min_id)\
-	get_elements_iterators_entry_above(attrs_iters, num_iters, iters,      \
-					   num_attrs, attrs, bucket, min_id)
-
-/*
- * get_elements_above_id get a few hashes represented by @elements and
- * @num_elements. The hashes fields are described by @num_offset, @data_offset
- * and @id_offset in the same way as required by for_each_element. The function
- * returns an array of @iters, represents an array of elements in the hashes
- * buckets, which their ids are the smallest ids in all hashes but are all
- * larger than the id given by min_id. Elements are only added to the iters
- * array if their id belongs to the bucket @bucket. The number of elements in
- * the returned array is returned by the function. @min_id is also updated to
- * reflect the new min_id of all elements in iters.
- */
-static size_t get_elements_above_id(const void **iters,
-				    unsigned int num_elements,
-				    const void **elements,
-				    size_t num_offset,
-				    size_t data_offset,
-				    size_t id_offset,
-				    u16 bucket,
-				    short *min_id)
-{
-	size_t num_iters = 0;
-	short min = SHRT_MAX;
-	const void *elem;
-	int i, j, last_stored = -1;
-	unsigned int equal_min = 0;
-
-	for_each_element(elem, i, j, elements, num_elements, num_offset,
-			 data_offset) {
-		u16 id = *(u16 *)(elem + id_offset);
-
-		if (GET_NS_ID(id) != bucket)
-			continue;
-
-		if (GET_ID(id) < *min_id ||
-		    (min != SHRT_MAX && GET_ID(id) > min))
-			continue;
-
-		/*
-		 * We first iterate all hashes represented by @elements. When
-		 * we do, we try to find an element @elem in the bucket @bucket
-		 * which its id is min. Since we can't ensure the user sorted
-		 * the elements in increasing order, we override this hash's
-		 * minimal id element we found, if a new element with a smaller
-		 * id was just found.
-		 */
-		iters[last_stored == i ? num_iters - 1 : num_iters++] = elem;
-		last_stored = i;
-		if (min == GET_ID(id))
-			equal_min++;
-		else
-			equal_min = 1;
-		min = GET_ID(id);
-	}
-
-	/*
-	 * We only insert to our iters array an element, if its id is smaller
-	 * than all previous ids. Therefore, the final iters array is sorted so
-	 * that smaller ids are in the end of the array.
-	 * Therefore, we need to clean the beginning of the array to make sure
-	 * all ids of final elements are equal to min.
-	 */
-	memmove(iters, iters + num_iters - equal_min, sizeof(*iters) * equal_min);
-
-	*min_id = min;
-	return equal_min;
-}
-
-#define find_max_element_entry_id(num_elements, elements, num_objects_fld, \
-				  objects_fld, bucket)			   \
-	find_max_element_id(num_elements, (const void **)(elements),	   \
-			    offsetof(typeof(**elements), num_objects_fld),    \
-			    offsetof(typeof(**elements), objects_fld),	      \
-			    offsetof(typeof(***(*elements)->objects_fld), id),\
-			    bucket)
-
-static short find_max_element_ns_id(unsigned int num_elements,
-				    const void **elements,
-				    size_t num_offset,
-				    size_t data_offset,
-				    size_t id_offset)
-{
-	short max_ns = SHRT_MIN;
-	const void *elem;
-	int i, j;
-
-	for_each_element(elem, i, j, elements, num_elements, num_offset,
-			 data_offset) {
-		u16 id = *(u16 *)(elem + id_offset);
-
-		if (GET_NS_ID(id) > max_ns)
-			max_ns = GET_NS_ID(id);
-	}
-
-	return max_ns;
-}
-
-static short find_max_element_id(unsigned int num_elements,
-				 const void **elements,
-				 size_t num_offset,
-				 size_t data_offset,
-				 size_t id_offset,
-				 u16 bucket)
-{
-	short max_id = SHRT_MIN;
-	const void *elem;
-	int i, j;
-
-	for_each_element(elem, i, j, elements, num_elements, num_offset,
-			 data_offset) {
-		u16 id = *(u16 *)(elem + id_offset);
-
-		if (GET_NS_ID(id) == bucket &&
-		    GET_ID(id) > max_id)
-			max_id = GET_ID(id);
-	}
-	return max_id;
-}
-
-#define find_max_element_entry_id(num_elements, elements, num_objects_fld,   \
-				  objects_fld, bucket)			      \
-	find_max_element_id(num_elements, (const void **)(elements),	      \
-			    offsetof(typeof(**elements), num_objects_fld),    \
-			    offsetof(typeof(**elements), objects_fld),	      \
-			    offsetof(typeof(***(*elements)->objects_fld), id),\
-			    bucket)
-
-#define find_max_element_ns_entry_id(num_elements, elements,		    \
-				     num_objects_fld, objects_fld)	    \
-	find_max_element_ns_id(num_elements, (const void **)(elements),	    \
-			      offsetof(typeof(**elements), num_objects_fld),\
-			      offsetof(typeof(**elements), objects_fld),    \
-			      offsetof(typeof(***(*elements)->objects_fld), id))
-
-/*
- * find_max_xxxx_ns_id gets a few elements. Each element is described by an id
- * which its upper bits represents a namespace. It finds the max namespace. This
- * could be used in order to know how many buckets do we need to allocate. If no
- * elements exist, SHRT_MIN is returned. Namespace represents here different
- * buckets. The common example is "common bucket" and "driver bucket".
- *
- * find_max_xxxx_id gets a few elements and a bucket. Each element is described
- * by an id which its upper bits represent a namespace. It returns the max id
- * which is contained in the same namespace defined in @bucket. This could be
- * used in order to know how many elements do we need to allocate in the bucket.
- * If no elements exist, SHRT_MIN is returned.
- */
-
-#define find_max_object_id(num_trees, trees, bucket)			\
-		find_max_element_entry_id(num_trees, trees, num_objects,\
-					  objects, bucket)
-#define find_max_object_ns_id(num_trees, trees)			\
-		find_max_element_ns_entry_id(num_trees, trees,		\
-					     num_objects, objects)
-
-#define find_max_method_id(num_iters, iters, bucket)			\
-		find_max_element_entry_id(num_iters, iters, num_methods,\
-					  methods, bucket)
-#define find_max_method_ns_id(num_iters, iters)			\
-		find_max_element_ns_entry_id(num_iters, iters,		\
-					     num_methods, methods)
-
-#define find_max_attr_id(num_iters, iters, bucket)			\
-		find_max_element_entry_id(num_iters, iters, num_attrs,  \
-					  attrs, bucket)
-#define find_max_attr_ns_id(num_iters, iters)				\
-		find_max_element_ns_entry_id(num_iters, iters,		\
-					     num_attrs, attrs)
-
-static void free_method(struct uverbs_method_spec *method)
-{
-	unsigned int i;
-
-	if (!method)
-		return;
-
-	for (i = 0; i < method->num_buckets; i++)
-		kfree(method->attr_buckets[i]);
-
-	kfree(method);
-}
-
-#define IS_ATTR_OBJECT(attr) ((attr)->type == UVERBS_ATTR_TYPE_IDR || \
-			      (attr)->type == UVERBS_ATTR_TYPE_FD)
-
-/*
- * This function gets array of size @num_method_defs which contains pointers to
- * method definitions @method_defs. The function allocates an
- * uverbs_method_spec structure and initializes its number of buckets and the
- * elements in buckets to the correct attributes. While doing that, it
- * validates that there aren't conflicts between attributes of different
- * method_defs.
- */
-static struct uverbs_method_spec *build_method_with_attrs(const struct uverbs_method_def **method_defs,
-							  size_t num_method_defs)
-{
-	int bucket_idx;
-	int max_attr_buckets = 0;
-	size_t num_attr_buckets = 0;
-	int res = 0;
-	struct uverbs_method_spec *method = NULL;
-	const struct uverbs_attr_def **attr_defs;
-	unsigned int num_of_singularities = 0;
-
-	max_attr_buckets = find_max_attr_ns_id(num_method_defs, method_defs);
-	if (max_attr_buckets >= 0)
-		num_attr_buckets = max_attr_buckets + 1;
-
-	method = kzalloc(struct_size(method, attr_buckets, num_attr_buckets),
-			 GFP_KERNEL);
-	if (!method)
-		return ERR_PTR(-ENOMEM);
-
-	method->num_buckets = num_attr_buckets;
-	attr_defs = kcalloc(num_method_defs, sizeof(*attr_defs), GFP_KERNEL);
-	if (!attr_defs) {
-		res = -ENOMEM;
-		goto free_method;
-	}
-	for (bucket_idx = 0; bucket_idx < method->num_buckets; bucket_idx++) {
-		short min_id = SHRT_MIN;
-		int attr_max_bucket = 0;
-		struct uverbs_attr_spec_hash *hash = NULL;
-
-		attr_max_bucket = find_max_attr_id(num_method_defs, method_defs,
-						   bucket_idx);
-		if (attr_max_bucket < 0)
-			continue;
-
-		hash = kzalloc(sizeof(*hash) +
-			       ALIGN(sizeof(*hash->attrs) * (attr_max_bucket + 1),
-				     sizeof(long)) +
-			       BITS_TO_LONGS(attr_max_bucket + 1) * sizeof(long),
-			       GFP_KERNEL);
-		if (!hash) {
-			res = -ENOMEM;
-			goto free;
-		}
-		hash->num_attrs = attr_max_bucket + 1;
-		method->num_child_attrs += hash->num_attrs;
-		hash->mandatory_attrs_bitmask = (void *)(hash + 1) +
-						 ALIGN(sizeof(*hash->attrs) *
-						       (attr_max_bucket + 1),
-						       sizeof(long));
-
-		method->attr_buckets[bucket_idx] = hash;
-
-		do {
-			size_t			 num_attr_defs;
-			struct uverbs_attr_spec	*attr;
-			bool attr_obj_with_special_access;
-
-			num_attr_defs =
-				get_attrs_above_id(attr_defs,
-						   num_method_defs,
-						   method_defs,
-						   bucket_idx,
-						   &min_id);
-			/* Last attr in bucket */
-			if (!num_attr_defs)
-				break;
-
-			if (num_attr_defs > 1) {
-				/*
-				 * We don't allow two attribute definitions for
-				 * the same attribute. This is usually a
-				 * programmer error. If required, it's better to
-				 * just add a new attribute to capture the new
-				 * semantics.
-				 */
-				res = -EEXIST;
-				goto free;
-			}
-
-			attr = &hash->attrs[min_id];
-			memcpy(attr, &attr_defs[0]->attr, sizeof(*attr));
-
-			attr_obj_with_special_access = IS_ATTR_OBJECT(attr) &&
-				   (attr->u.obj.access == UVERBS_ACCESS_NEW ||
-				    attr->u.obj.access == UVERBS_ACCESS_DESTROY);
-			num_of_singularities +=  !!attr_obj_with_special_access;
-			if (WARN(num_of_singularities > 1,
-				 "ib_uverbs: Method contains more than one object attr (%d) with new/destroy access\n",
-				 min_id) ||
-			    WARN(attr_obj_with_special_access &&
-				 !attr->mandatory,
-				 "ib_uverbs: Tried to merge attr (%d) but it's an object with new/destroy access but isn't mandatory\n",
-				 min_id) ||
-			    WARN(IS_ATTR_OBJECT(attr) &&
-				 attr->zero_trailing,
-				 "ib_uverbs: Tried to merge attr (%d) but it's an object with min_sz flag\n",
-				 min_id)) {
-				res = -EINVAL;
-				goto free;
-			}
-
-			if (attr->mandatory)
-				set_bit(min_id, hash->mandatory_attrs_bitmask);
-			min_id++;
-
-		} while (1);
-	}
-	kfree(attr_defs);
-	return method;
-
-free:
-	kfree(attr_defs);
-free_method:
-	free_method(method);
-	return ERR_PTR(res);
-}
-
-static void free_object(struct uverbs_object_spec *object)
-{
-	unsigned int i, j;
-
-	if (!object)
-		return;
-
-	for (i = 0; i < object->num_buckets; i++) {
-		struct uverbs_method_spec_hash	*method_buckets =
-			object->method_buckets[i];
-
-		if (!method_buckets)
-			continue;
-
-		for (j = 0; j < method_buckets->num_methods; j++)
-			free_method(method_buckets->methods[j]);
-
-		kfree(method_buckets);
-	}
-
-	kfree(object);
-}
-
-/*
- * This function gets array of size @num_object_defs which contains pointers to
- * object definitions @object_defs. The function allocated an
- * uverbs_object_spec structure and initialize its number of buckets and the
- * elements in buckets to the correct methods. While doing that, it
- * sorts out the correct relationship between conflicts in the same method.
- */
-static struct uverbs_object_spec *build_object_with_methods(const struct uverbs_object_def **object_defs,
-							    size_t num_object_defs)
-{
-	u16 bucket_idx;
-	int max_method_buckets = 0;
-	u16 num_method_buckets = 0;
-	int res = 0;
-	struct uverbs_object_spec *object = NULL;
-	const struct uverbs_method_def **method_defs;
-
-	max_method_buckets = find_max_method_ns_id(num_object_defs, object_defs);
-	if (max_method_buckets >= 0)
-		num_method_buckets = max_method_buckets + 1;
-
-	object = kzalloc(struct_size(object, method_buckets,
-				     num_method_buckets),
-			 GFP_KERNEL);
-	if (!object)
-		return ERR_PTR(-ENOMEM);
-
-	object->num_buckets = num_method_buckets;
-	method_defs = kcalloc(num_object_defs, sizeof(*method_defs), GFP_KERNEL);
-	if (!method_defs) {
-		res = -ENOMEM;
-		goto free_object;
-	}
-
-	for (bucket_idx = 0; bucket_idx < object->num_buckets; bucket_idx++) {
-		short min_id = SHRT_MIN;
-		int methods_max_bucket = 0;
-		struct uverbs_method_spec_hash *hash = NULL;
-
-		methods_max_bucket = find_max_method_id(num_object_defs, object_defs,
-							bucket_idx);
-		if (methods_max_bucket < 0)
-			continue;
-
-		hash = kzalloc(struct_size(hash, methods,
-					   methods_max_bucket + 1),
-			       GFP_KERNEL);
-		if (!hash) {
-			res = -ENOMEM;
-			goto free;
-		}
-
-		hash->num_methods = methods_max_bucket + 1;
-		object->method_buckets[bucket_idx] = hash;
-
-		do {
-			size_t				num_method_defs;
-			struct uverbs_method_spec	*method;
-			int i;
-
-			num_method_defs =
-				get_methods_above_id(method_defs,
-						     num_object_defs,
-						     object_defs,
-						     bucket_idx,
-						     &min_id);
-			/* Last method in bucket */
-			if (!num_method_defs)
-				break;
-
-			method = build_method_with_attrs(method_defs,
-							 num_method_defs);
-			if (IS_ERR(method)) {
-				res = PTR_ERR(method);
-				goto free;
-			}
-
-			/*
-			 * The last tree which is given as an argument to the
-			 * merge overrides previous method handler.
-			 * Therefore, we iterate backwards and search for the
-			 * first handler which != NULL. This also defines the
-			 * set of flags used for this handler.
-			 */
-			for (i = num_method_defs - 1;
-			     i >= 0 && !method_defs[i]->handler; i--)
-				;
-			hash->methods[min_id++] = method;
-			/* NULL handler isn't allowed */
-			if (WARN(i < 0,
-				 "ib_uverbs: tried to merge function id %d, but all handlers are NULL\n",
-				 min_id)) {
-				res = -EINVAL;
-				goto free;
-			}
-			method->handler = method_defs[i]->handler;
-			method->flags = method_defs[i]->flags;
-
-		} while (1);
-	}
-	kfree(method_defs);
-	return object;
-
-free:
-	kfree(method_defs);
-free_object:
-	free_object(object);
-	return ERR_PTR(res);
-}
-
-void uverbs_free_spec_tree(struct uverbs_root_spec *root)
-{
-	unsigned int i, j;
-
-	if (!root)
-		return;
-
-	for (i = 0; i < root->num_buckets; i++) {
-		struct uverbs_object_spec_hash *object_hash =
-			root->object_buckets[i];
-
-		if (!object_hash)
-			continue;
-
-		for (j = 0; j < object_hash->num_objects; j++)
-			free_object(object_hash->objects[j]);
-
-		kfree(object_hash);
-	}
-
-	kfree(root);
-}
-
-struct uverbs_root_spec *uverbs_alloc_spec_tree(unsigned int num_trees,
-						const struct uverbs_object_tree_def **trees)
-{
-	u16 bucket_idx;
-	short max_object_buckets = 0;
-	size_t num_objects_buckets = 0;
-	struct uverbs_root_spec *root_spec = NULL;
-	const struct uverbs_object_def **object_defs;
-	int i;
-	int res = 0;
-
-	max_object_buckets = find_max_object_ns_id(num_trees, trees);
-	/*
-	 * Devices which don't want to support ib_uverbs, should just allocate
-	 * an empty parsing tree. Every user-space command won't hit any valid
-	 * entry in the parsing tree and thus will fail.
-	 */
-	if (max_object_buckets >= 0)
-		num_objects_buckets = max_object_buckets + 1;
-
-	root_spec = kzalloc(struct_size(root_spec, object_buckets,
-					num_objects_buckets),
-			    GFP_KERNEL);
-	if (!root_spec)
-		return ERR_PTR(-ENOMEM);
-	root_spec->num_buckets = num_objects_buckets;
-
-	object_defs = kcalloc(num_trees, sizeof(*object_defs),
-			      GFP_KERNEL);
-	if (!object_defs) {
-		res = -ENOMEM;
-		goto free_root;
-	}
-
-	for (bucket_idx = 0; bucket_idx < root_spec->num_buckets; bucket_idx++) {
-		short min_id = SHRT_MIN;
-		short objects_max_bucket;
-		struct uverbs_object_spec_hash *hash = NULL;
-
-		objects_max_bucket = find_max_object_id(num_trees, trees,
-							bucket_idx);
-		if (objects_max_bucket < 0)
-			continue;
-
-		hash = kzalloc(struct_size(hash, objects,
-					   objects_max_bucket + 1),
-			       GFP_KERNEL);
-		if (!hash) {
-			res = -ENOMEM;
-			goto free;
-		}
-		hash->num_objects = objects_max_bucket + 1;
-		root_spec->object_buckets[bucket_idx] = hash;
-
-		do {
-			size_t				num_object_defs;
-			struct uverbs_object_spec	*object;
-
-			num_object_defs = get_objects_above_id(object_defs,
-							       num_trees,
-							       trees,
-							       bucket_idx,
-							       &min_id);
-			/* Last object in bucket */
-			if (!num_object_defs)
-				break;
-
-			object = build_object_with_methods(object_defs,
-							   num_object_defs);
-			if (IS_ERR(object)) {
-				res = PTR_ERR(object);
-				goto free;
-			}
-
-			/*
-			 * The last tree which is given as an argument to the
-			 * merge overrides previous object's type_attrs.
-			 * Therefore, we iterate backwards and search for the
-			 * first type_attrs which != NULL.
-			 */
-			for (i = num_object_defs - 1;
-			     i >= 0 && !object_defs[i]->type_attrs; i--)
-				;
-			/*
-			 * NULL is a valid type_attrs. It means an object we
-			 * can't instantiate (like DEVICE).
-			 */
-			object->type_attrs = i < 0 ? NULL :
-				object_defs[i]->type_attrs;
-
-			hash->objects[min_id++] = object;
-		} while (1);
-	}
-
-	kfree(object_defs);
-	return root_spec;
-
-free:
-	kfree(object_defs);
-free_root:
-	uverbs_free_spec_tree(root_spec);
-	return ERR_PTR(res);
-}
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index 0fab083cafef..823beca448e1 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -176,7 +176,6 @@ static void ib_uverbs_release_dev(struct kobject *kobj)
 
 	uverbs_destroy_api(dev->uapi);
 	cleanup_srcu_struct(&dev->disassociate_srcu);
-	uverbs_free_spec_tree(dev->specs_root);
 	kfree(dev);
 }
 
@@ -998,37 +997,12 @@ static CLASS_ATTR_STRING(abi_version, S_IRUGO,
 static int ib_uverbs_create_uapi(struct ib_device *device,
 				 struct ib_uverbs_device *uverbs_dev)
 {
-	const struct uverbs_object_tree_def **specs;
-	struct uverbs_root_spec *specs_root;
-	unsigned int num_specs = 1;
 	struct uverbs_api *uapi;
-	unsigned int i;
-
-	if (device->driver_specs)
-		for (i = 0; device->driver_specs[i]; i++)
-			num_specs++;
-
-	specs = kmalloc_array(num_specs, sizeof(*specs), GFP_KERNEL);
-	if (!specs)
-		return -ENOMEM;
-
-	specs[0] = uverbs_default_get_objects();
-	if (device->driver_specs)
-		for (i = 0; device->driver_specs[i]; i++)
-			specs[i+1] = device->driver_specs[i];
-
-	specs_root = uverbs_alloc_spec_tree(num_specs, specs);
-	kfree(specs);
-	if (IS_ERR(specs_root))
-		return PTR_ERR(specs_root);
 
 	uapi = uverbs_alloc_api(device->driver_specs, device->driver_id);
-	if (IS_ERR(uapi)) {
-		uverbs_free_spec_tree(specs_root);
+	if (IS_ERR(uapi))
 		return PTR_ERR(uapi);
-	}
 
-	uverbs_dev->specs_root = specs_root;
 	uverbs_dev->uapi = uapi;
 	return 0;
 }