From owner-svn-src-all@freebsd.org Thu Jan 2 22:42:18 2020 Return-Path: Delivered-To: svn-src-all@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id B83131DD66E; Thu, 2 Jan 2020 22:42:18 +0000 (UTC) (envelope-from erj@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 47pjhp4Xjlz44L5; Thu, 2 Jan 2020 22:42:18 +0000 (UTC) (envelope-from erj@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 95208229C8; Thu, 2 Jan 2020 22:42:18 +0000 (UTC) (envelope-from erj@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 002MgIat022259; Thu, 2 Jan 2020 22:42:18 GMT (envelope-from erj@FreeBSD.org) Received: (from erj@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 002MgIpL022258; Thu, 2 Jan 2020 22:42:18 GMT (envelope-from erj@FreeBSD.org) Message-Id: <202001022242.002MgIpL022258@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: erj set sender to erj@FreeBSD.org using -f From: Eric Joyner Date: Thu, 2 Jan 2020 22:42:18 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r356297 - stable/12/sys/net X-SVN-Group: stable-12 X-SVN-Commit-Author: erj X-SVN-Commit-Paths: stable/12/sys/net X-SVN-Commit-Revision: 356297 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 02 Jan 2020 22:42:18 -0000 Author: erj Date: Thu Jan 2 22:42:18 2020 New Revision: 356297 URL: https://svnweb.freebsd.org/changeset/base/356297 Log: MFC r353967: iflib: call ether_ifdetach and netmap_detach before stop This prevents a possible page fault resulting from a race condition. Sponsored by: Intel Corporation Modified: stable/12/sys/net/iflib.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/net/iflib.c ============================================================================== --- stable/12/sys/net/iflib.c Thu Jan 2 22:37:04 2020 (r356296) +++ stable/12/sys/net/iflib.c Thu Jan 2 22:42:18 2020 (r356297) @@ -708,6 +708,7 @@ static int iflib_altq_if_transmit(if_t ifp, struct mbu #endif static int iflib_register(if_ctx_t); static void iflib_deregister(if_ctx_t); +static void iflib_unregister_vlan_handlers(if_ctx_t ctx); static void iflib_init_locked(if_ctx_t ctx); static void iflib_add_device_sysctl_pre(if_ctx_t ctx); static void iflib_add_device_sysctl_post(if_ctx_t ctx); @@ -4951,6 +4952,9 @@ iflib_pseudo_deregister(if_ctx_t ctx) struct taskqgroup *tqg; iflib_fl_t fl; + /* Unregister VLAN event handlers early */ + iflib_unregister_vlan_handlers(ctx); + ether_ifdetach(ifp); /* XXX drain any dependent tasks */ tqg = qgroup_if_io_tqg; @@ -5024,12 +5028,16 @@ iflib_device_deregister(if_ctx_t ctx) ctx->ifc_flags |= IFC_IN_DETACH; STATE_UNLOCK(ctx); + /* Unregister VLAN handlers before calling iflib_stop() */ + iflib_unregister_vlan_handlers(ctx); + + iflib_netmap_detach(ifp); + ether_ifdetach(ifp); + CTX_LOCK(ctx); iflib_stop(ctx); CTX_UNLOCK(ctx); - iflib_netmap_detach(ifp); - ether_ifdetach(ifp); if (ctx->ifc_led_dev != NULL) led_destroy(ctx->ifc_led_dev); /* XXX drain any dependent tasks */ @@ -5316,13 +5324,8 @@ iflib_register(if_ctx_t ctx) } static void -iflib_deregister(if_ctx_t ctx) +iflib_unregister_vlan_handlers(if_ctx_t ctx) { - if_t ifp = ctx->ifc_ifp; - - /* Remove all media */ - ifmedia_removeall(&ctx->ifc_media); - /* Unregister VLAN events */ if (ctx->ifc_vlan_attach_event != NULL) { EVENTHANDLER_DEREGISTER(vlan_config, ctx->ifc_vlan_attach_event); @@ -5332,6 +5335,19 @@ iflib_deregister(if_ctx_t ctx) EVENTHANDLER_DEREGISTER(vlan_unconfig, ctx->ifc_vlan_detach_event); ctx->ifc_vlan_detach_event = NULL; } + +} + +static void +iflib_deregister(if_ctx_t ctx) +{ + if_t ifp = ctx->ifc_ifp; + + /* Remove all media */ + ifmedia_removeall(&ctx->ifc_media); + + /* Ensure that VLAN event handlers are unregistered */ + iflib_unregister_vlan_handlers(ctx); /* Release kobject reference */ kobj_delete((kobj_t) ctx, NULL);