From owner-svn-src-stable-10@FreeBSD.ORG Mon Dec 29 00:30:39 2014 Return-Path: Delivered-To: svn-src-stable-10@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 44F845DA; Mon, 29 Dec 2014 00:30:39 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::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 164176449F; Mon, 29 Dec 2014 00:30:39 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.9/8.14.9) with ESMTP id sBT0UcHo073316; Mon, 29 Dec 2014 00:30:38 GMT (envelope-from kib@FreeBSD.org) Received: (from kib@localhost) by svn.freebsd.org (8.14.9/8.14.9/Submit) id sBT0Uc07073315; Mon, 29 Dec 2014 00:30:38 GMT (envelope-from kib@FreeBSD.org) Message-Id: <201412290030.sBT0Uc07073315@svn.freebsd.org> X-Authentication-Warning: svn.freebsd.org: kib set sender to kib@FreeBSD.org using -f From: Konstantin Belousov Date: Mon, 29 Dec 2014 00:30:38 +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: r276353 - stable/10/sys/kern X-SVN-Group: stable-10 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-10@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: SVN commit messages for only the 10-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Dec 2014 00:30:39 -0000 Author: kib Date: Mon Dec 29 00:30:38 2014 New Revision: 276353 URL: https://svnweb.freebsd.org/changeset/base/276353 Log: MFC r275260: Remove lock recursion for the pipe pair mutex, and disable the recursion on mutex initialization. Modified: stable/10/sys/kern/sys_pipe.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/kern/sys_pipe.c ============================================================================== --- stable/10/sys/kern/sys_pipe.c Mon Dec 29 00:10:43 2014 (r276352) +++ stable/10/sys/kern/sys_pipe.c Mon Dec 29 00:30:38 2014 (r276353) @@ -315,7 +315,7 @@ pipe_zone_init(void *mem, int size, int pp = (struct pipepair *)mem; - mtx_init(&pp->pp_mtx, "pipe mutex", NULL, MTX_DEF | MTX_RECURSE); + mtx_init(&pp->pp_mtx, "pipe mutex", NULL, MTX_DEF); return (0); } @@ -1770,7 +1770,7 @@ filt_piperead(struct knote *kn, long hin struct pipe *wpipe = rpipe->pipe_peer; int ret; - PIPE_LOCK(rpipe); + PIPE_LOCK_ASSERT(rpipe, MA_OWNED); kn->kn_data = rpipe->pipe_buffer.cnt; if ((kn->kn_data == 0) && (rpipe->pipe_state & PIPE_DIRECTW)) kn->kn_data = rpipe->pipe_map.cnt; @@ -1779,11 +1779,9 @@ filt_piperead(struct knote *kn, long hin wpipe->pipe_present != PIPE_ACTIVE || (wpipe->pipe_state & PIPE_EOF)) { kn->kn_flags |= EV_EOF; - PIPE_UNLOCK(rpipe); return (1); } ret = kn->kn_data > 0; - PIPE_UNLOCK(rpipe); return ret; } @@ -1794,12 +1792,11 @@ filt_pipewrite(struct knote *kn, long hi struct pipe *wpipe; wpipe = kn->kn_hook; - PIPE_LOCK(wpipe); + PIPE_LOCK_ASSERT(wpipe, MA_OWNED); if (wpipe->pipe_present != PIPE_ACTIVE || (wpipe->pipe_state & PIPE_EOF)) { kn->kn_data = 0; kn->kn_flags |= EV_EOF; - PIPE_UNLOCK(wpipe); return (1); } kn->kn_data = (wpipe->pipe_buffer.size > 0) ? @@ -1807,7 +1804,6 @@ filt_pipewrite(struct knote *kn, long hi if (wpipe->pipe_state & PIPE_DIRECTW) kn->kn_data = 0; - PIPE_UNLOCK(wpipe); return (kn->kn_data >= PIPE_BUF); }