From owner-svn-src-all@freebsd.org Wed Dec 2 10:23:55 2015 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 88890A3D2D6; Wed, 2 Dec 2015 10:23:55 +0000 (UTC) (envelope-from royger@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 mx1.freebsd.org (Postfix) with ESMTPS id 538CB1B46; Wed, 2 Dec 2015 10:23:55 +0000 (UTC) (envelope-from royger@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id tB2ANsKj032635; Wed, 2 Dec 2015 10:23:54 GMT (envelope-from royger@FreeBSD.org) Received: (from royger@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id tB2ANstv032634; Wed, 2 Dec 2015 10:23:54 GMT (envelope-from royger@FreeBSD.org) Message-Id: <201512021023.tB2ANstv032634@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: royger set sender to royger@FreeBSD.org using -f From: =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= Date: Wed, 2 Dec 2015 10:23:54 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r291644 - stable/10/sys/x86/x86 X-SVN-Group: stable-10 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: 2.1.20 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: Wed, 02 Dec 2015 10:23:55 -0000 Author: royger Date: Wed Dec 2 10:23:54 2015 New Revision: 291644 URL: https://svnweb.freebsd.org/changeset/base/291644 Log: MFC r291022: x86/intr: allow mutex recursion in intr_remove_handler Sponsored by: Citrix Systems R&D Modified: stable/10/sys/x86/x86/intr_machdep.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/x86/x86/intr_machdep.c ============================================================================== --- stable/10/sys/x86/x86/intr_machdep.c Wed Dec 2 08:17:31 2015 (r291643) +++ stable/10/sys/x86/x86/intr_machdep.c Wed Dec 2 10:23:54 2015 (r291644) @@ -197,19 +197,28 @@ int intr_remove_handler(void *cookie) { struct intsrc *isrc; - int error; + int error, mtx_owned; isrc = intr_handler_source(cookie); error = intr_event_remove_handler(cookie); if (error == 0) { - mtx_lock(&intr_table_lock); + /* + * Recursion is needed here so PICs can remove interrupts + * while resuming. It was previously not possible due to + * intr_resume holding the intr_table_lock and + * intr_remove_handler recursing on it. + */ + mtx_owned = mtx_owned(&intr_table_lock); + if (mtx_owned == 0) + mtx_lock(&intr_table_lock); isrc->is_handlers--; if (isrc->is_handlers == 0) { isrc->is_pic->pic_disable_source(isrc, PIC_NO_EOI); isrc->is_pic->pic_disable_intr(isrc); } intrcnt_updatename(isrc); - mtx_unlock(&intr_table_lock); + if (mtx_owned == 0) + mtx_unlock(&intr_table_lock); } return (error); }