+int crypto_unregister_instance(struct crypto_alg *alg)
+{
+ int err;
+ struct crypto_instance *inst = (void *)alg;
+ struct crypto_template *tmpl = inst->tmpl;
+ LIST_HEAD(users);
+
+ if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
+ return -EINVAL;
+
+ BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
+
+ down_write(&crypto_alg_sem);
+
+ hlist_del_init(&inst->list);
+ err = crypto_remove_alg(alg, &users);
+
+ up_write(&crypto_alg_sem);
+
+ if (err)
+ return err;
+
+ tmpl->free(inst);
+ crypto_remove_final(&users);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_instance);
+