IB: ucontext should be set properly for all cmd & ioctl paths

the Attempt to use the below commit to initialize the ucontext for the
uobject destroy path has shown that the below commit is incomplete.

Parts were reverted and the ucontext set up in the uverbs_attr_bundle was
moved to rdma_lookup_get_uobject which is called from the uobj_get_XXX
macros and rdma_alloc_begin_uobject which is called when uobject is
created.

Fixes: 3d9dfd060391 ("IB/uverbs: Add ib_ucontext to uverbs_attr_bundle sent from ioctl and cmd flows")
Signed-off-by: Shamir Rabinovitch <shamir.rabinovitch@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

1 files changed, 21 insertions, 49 deletions

diff --git a/drivers/infiniband/core/rdma_core.c b/drivers/infiniband/core/rdma_core.c
index 778375ff664e..0d18fb0e975d 100644
--- a/drivers/infiniband/core/rdma_core.c
+++ b/drivers/infiniband/core/rdma_core.c
@@ -224,14 +224,13 @@ out_unlock:
  * uverbs_put_destroy.
  */
 struct ib_uobject *__uobj_get_destroy(const struct uverbs_api_object *obj,
-				      u32 id,
-				      const struct uverbs_attr_bundle *attrs)
+				      u32 id, struct uverbs_attr_bundle *attrs)
 {
 	struct ib_uobject *uobj;
 	int ret;
 
 	uobj = rdma_lookup_get_uobject(obj, attrs->ufile, id,
-				       UVERBS_LOOKUP_DESTROY);
+				       UVERBS_LOOKUP_DESTROY, attrs);
 	if (IS_ERR(uobj))
 		return uobj;
 
@@ -249,7 +248,7 @@ struct ib_uobject *__uobj_get_destroy(const struct uverbs_api_object *obj,
  * (negative errno on failure). For use by callers that do not need the uobj.
  */
 int __uobj_perform_destroy(const struct uverbs_api_object *obj, u32 id,
-			   const struct uverbs_attr_bundle *attrs)
+			   struct uverbs_attr_bundle *attrs)
 {
 	struct ib_uobject *uobj;
 
@@ -393,7 +392,8 @@ lookup_get_fd_uobject(const struct uverbs_api_object *obj,
 
 struct ib_uobject *rdma_lookup_get_uobject(const struct uverbs_api_object *obj,
 					   struct ib_uverbs_file *ufile, s64 id,
-					   enum rdma_lookup_mode mode)
+					   enum rdma_lookup_mode mode,
+					   struct uverbs_attr_bundle *attrs)
 {
 	struct ib_uobject *uobj;
 	int ret;
@@ -431,6 +431,8 @@ struct ib_uobject *rdma_lookup_get_uobject(const struct uverbs_api_object *obj,
 	ret = uverbs_try_lock_object(uobj, mode);
 	if (ret)
 		goto free;
+	if (attrs)
+		attrs->context = uobj->context;
 
 	return uobj;
 free:
@@ -438,38 +440,6 @@ free:
 	uverbs_uobject_put(uobj);
 	return ERR_PTR(ret);
 }
-struct ib_uobject *_uobj_get_read(enum uverbs_default_objects type,
-				  u32 object_id,
-				  struct uverbs_attr_bundle *attrs)
-{
-	struct ib_uobject *uobj;
-
-	uobj = rdma_lookup_get_uobject(uobj_get_type(attrs, type), attrs->ufile,
-				       object_id, UVERBS_LOOKUP_READ);
-	if (IS_ERR(uobj))
-		return uobj;
-
-	attrs->context = uobj->context;
-
-	return uobj;
-}
-
-struct ib_uobject *_uobj_get_write(enum uverbs_default_objects type,
-				   u32 object_id,
-				   struct uverbs_attr_bundle *attrs)
-{
-	struct ib_uobject *uobj;
-
-	uobj = rdma_lookup_get_uobject(uobj_get_type(attrs, type), attrs->ufile,
-				       object_id, UVERBS_LOOKUP_WRITE);
-
-	if (IS_ERR(uobj))
-		return uobj;
-
-	attrs->context = uobj->context;
-
-	return uobj;
-}
 
 static struct ib_uobject *
 alloc_begin_idr_uobject(const struct uverbs_api_object *obj,
@@ -526,7 +496,8 @@ alloc_begin_fd_uobject(const struct uverbs_api_object *obj,
 }
 
 struct ib_uobject *rdma_alloc_begin_uobject(const struct uverbs_api_object *obj,
-					    struct ib_uverbs_file *ufile)
+					    struct ib_uverbs_file *ufile,
+					    struct uverbs_attr_bundle *attrs)
 {
 	struct ib_uobject *ret;
 
@@ -546,6 +517,8 @@ struct ib_uobject *rdma_alloc_begin_uobject(const struct uverbs_api_object *obj,
 		up_read(&ufile->hw_destroy_rwsem);
 		return ret;
 	}
+	if (attrs)
+		attrs->context = ret->context;
 	return ret;
 }
 
@@ -967,26 +940,25 @@ const struct uverbs_obj_type_class uverbs_fd_class = {
 EXPORT_SYMBOL(uverbs_fd_class);
 
 struct ib_uobject *
-uverbs_get_uobject_from_file(u16 object_id,
-			     struct ib_uverbs_file *ufile,
-			     enum uverbs_obj_access access, s64 id)
+uverbs_get_uobject_from_file(u16 object_id, enum uverbs_obj_access access,
+			     s64 id, struct uverbs_attr_bundle *attrs)
 {
 	const struct uverbs_api_object *obj =
-		uapi_get_object(ufile->device->uapi, object_id);
+		uapi_get_object(attrs->ufile->device->uapi, object_id);
 
 	switch (access) {
 	case UVERBS_ACCESS_READ:
-		return rdma_lookup_get_uobject(obj, ufile, id,
-					       UVERBS_LOOKUP_READ);
+		return rdma_lookup_get_uobject(obj, attrs->ufile, id,
+					       UVERBS_LOOKUP_READ, attrs);
 	case UVERBS_ACCESS_DESTROY:
 		/* Actual destruction is done inside uverbs_handle_method */
-		return rdma_lookup_get_uobject(obj, ufile, id,
-					       UVERBS_LOOKUP_DESTROY);
+		return rdma_lookup_get_uobject(obj, attrs->ufile, id,
+					       UVERBS_LOOKUP_DESTROY, attrs);
 	case UVERBS_ACCESS_WRITE:
-		return rdma_lookup_get_uobject(obj, ufile, id,
-					       UVERBS_LOOKUP_WRITE);
+		return rdma_lookup_get_uobject(obj, attrs->ufile, id,
+					       UVERBS_LOOKUP_WRITE, attrs);
 	case UVERBS_ACCESS_NEW:
-		return rdma_alloc_begin_uobject(obj, ufile);
+		return rdma_alloc_begin_uobject(obj, attrs->ufile, attrs);
 	default:
 		WARN_ON(true);
 		return ERR_PTR(-EOPNOTSUPP);