From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 37DE2C4360C for ; Mon, 30 Sep 2019 09:38:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 04DD921920 for ; Mon, 30 Sep 2019 09:38:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=samba.org header.i=@samba.org header.b="jiksKiJd" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730551AbfI3JiH (ORCPT ); Mon, 30 Sep 2019 05:38:07 -0400 Received: from hr2.samba.org ([144.76.82.148]:16630 "EHLO hr2.samba.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729590AbfI3JiG (ORCPT ); Mon, 30 Sep 2019 05:38:06 -0400 X-Greylist: delayed 1973 seconds by postgrey-1.27 at vger.kernel.org; Mon, 30 Sep 2019 05:38:05 EDT DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=samba.org; s=42627210; h=Message-Id:Date:Cc:To:From; bh=zqgK4TKq5AjyZis1KXUpbTQ/RkluYjIwx9cMHd/BAek=; b=jiksKiJdxzgeoA76iCn21wcCHW 7CgfCUSfzb37o8tczI9mfjuVutjMngDB2fgb4/Me7is6d/UCNTksPjzjR/WCKKMznguQHnwC4fxlH VEiQbaQUETSf/96BLkK2Je65pfrFH+O5TT30DdV2DM9T3ZF0wlSosDKRkJ0psLIVjXds=; Received: from [127.0.0.2] (localhost [127.0.0.1]) by hr2.samba.org with esmtpsa (TLS1.3:ECDHE_RSA_CHACHA20_POLY1305:256) (Exim) id 1iErcE-0003BT-CH; Mon, 30 Sep 2019 09:05:10 +0000 From: Stefan Metzmacher To: linux-rdma@vger.kernel.org Cc: Stefan Metzmacher Subject: [PATCH] rdma/core: add __module_get()/module_put() to cma_[de]ref_dev() Date: Mon, 30 Sep 2019 11:04:55 +0200 Message-Id: <20190930090455.10772-1-metze@samba.org> X-Mailer: git-send-email 2.17.1 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org Currently there seems to be a problem when an RDMA listener or connection is active on an ib_device. 'rmmod rdma_rxe' (the same for 'siw' and most likely all others) just hangs like this until shutdown the listeners and connections: [<0>] remove_client_context+0x97/0xe0 [ib_core] [<0>] disable_device+0x90/0x120 [ib_core] [<0>] __ib_unregister_device+0x41/0xa0 [ib_core] [<0>] ib_unregister_driver+0xbb/0x100 [ib_core] [<0>] rxe_module_exit+0x1a/0x8aa [rdma_rxe] [<0>] __x64_sys_delete_module+0x147/0x290 [<0>] do_syscall_64+0x5a/0x130 [<0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 The following would be expected: rmmod: ERROR: Module rdma_rxe is in use And this change provides that. Once all add listeners and connections are gone the module can be removed again. Signed-off-by: Stefan Metzmacher Cc: stable@vger.kernel.org --- drivers/infiniband/core/cma.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c index a68d0ccf67a4..d10f3d01fa02 100644 --- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -276,6 +276,7 @@ enum { void cma_ref_dev(struct cma_device *cma_dev) { atomic_inc(&cma_dev->refcount); + __module_get(cma_dev->device->ops.owner); } struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter filter, @@ -512,6 +513,7 @@ static void cma_attach_to_dev(struct rdma_id_private *id_priv, void cma_deref_dev(struct cma_device *cma_dev) { + module_put(cma_dev->device->ops.owner); if (atomic_dec_and_test(&cma_dev->refcount)) complete(&cma_dev->comp); } -- 2.17.1