[IB] Add idr_destroy() calls on module unload

Add idr_destroy() calls to the module_exit() functions of the four IB
driver modules that use idrs, so we don't leak idr_layer_cache objects
when these modules are unloaded.
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/core/cm.c

@@ -3323,6 +3323,7 @@ static void __exit ib_cm_cleanup(void)
 	flush_workqueue(cm.wq);
 	destroy_workqueue(cm.wq);
 	ib_unregister_client(&cm_client);
+	idr_destroy(&cm.local_id_table);
 }
 
 module_init(ib_cm_init);

drivers/infiniband/core/sa_query.c

@@ -975,6 +975,7 @@ static int __init ib_sa_init(void)
 static void __exit ib_sa_cleanup(void)
 {
 	ib_unregister_client(&sa_client);
+	idr_destroy(&query_idr);
 }
 
 module_init(ib_sa_init);

drivers/infiniband/core/ucm.c

@@ -1320,6 +1320,7 @@ static void __exit ib_ucm_cleanup(void)
 	class_destroy(ib_ucm_class);
 	cdev_del(&ib_ucm_cdev);
 	unregister_chrdev_region(IB_UCM_DEV, 1);
+	idr_destroy(&ctx_id_table);
 }
 
 module_init(ib_ucm_init);

drivers/infiniband/core/uverbs_main.c

@@ -762,6 +762,13 @@ static void __exit ib_uverbs_cleanup(void)
 	unregister_filesystem(&uverbs_event_fs);
 	class_unregister(&uverbs_class);
 	unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
+	idr_destroy(&ib_uverbs_pd_idr);
+	idr_destroy(&ib_uverbs_mr_idr);
+	idr_destroy(&ib_uverbs_mw_idr);
+	idr_destroy(&ib_uverbs_ah_idr);
+	idr_destroy(&ib_uverbs_cq_idr);
+	idr_destroy(&ib_uverbs_qp_idr);
+	idr_destroy(&ib_uverbs_srq_idr);
 }
 
 module_init(ib_uverbs_init);