From patchwork Sun Aug 7 14:30:41 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Aring X-Patchwork-Id: 9266393 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 04FDE60754 for ; Sun, 7 Aug 2016 14:33:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EBBE126C2F for ; Sun, 7 Aug 2016 14:33:27 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E090127E5A; Sun, 7 Aug 2016 14:33:27 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A0E3226C2F for ; Sun, 7 Aug 2016 14:33:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751986AbcHGOd1 (ORCPT ); Sun, 7 Aug 2016 10:33:27 -0400 Received: from metis.ext.4.pengutronix.de ([92.198.50.35]:53496 "EHLO metis.ext.4.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751985AbcHGOdD (ORCPT ); Sun, 7 Aug 2016 10:33:03 -0400 Received: from gallifrey.ext.pengutronix.de ([2001:67c:670:201:5054:ff:fe8d:eefb] helo=omega.localdomain) by metis.ext.pengutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1bWP8P-0001Um-CK; Sun, 07 Aug 2016 16:33:01 +0200 From: Alexander Aring To: linux-wpan@vger.kernel.org Cc: kernel@pengutronix.de, linux-bluetooth@vger.kernel.org, Alexander Aring Subject: [RFCv2 bluetooth-next 04/19] 6lowpan: hold netdev while unregister Date: Sun, 7 Aug 2016 16:30:41 +0200 Message-Id: <20160807143056.3116-5-aar@pengutronix.de> X-Mailer: git-send-email 2.9.2 In-Reply-To: <20160807143056.3116-1-aar@pengutronix.de> References: <20160807143056.3116-1-aar@pengutronix.de> X-SA-Exim-Connect-IP: 2001:67c:670:201:5054:ff:fe8d:eefb X-SA-Exim-Mail-From: aar@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-wpan@vger.kernel.org Sender: linux-wpan-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wpan@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP I saw that unregister_netdevice will also free the netdev by running dev_put. This may clash run debugfs exist, because it use netdevice private data room. Signed-off-by: Alexander Aring --- net/6lowpan/core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/6lowpan/core.c b/net/6lowpan/core.c index 5945f7e..00ffab3 100644 --- a/net/6lowpan/core.c +++ b/net/6lowpan/core.c @@ -62,8 +62,10 @@ EXPORT_SYMBOL(lowpan_register_netdev); void lowpan_unregister_netdevice(struct net_device *dev) { + dev_hold(dev); unregister_netdevice(dev); lowpan_dev_debugfs_exit(dev); + dev_put(dev); } EXPORT_SYMBOL(lowpan_unregister_netdevice);