From owner-svn-src-all@freebsd.org Wed Sep 20 21:19:55 2017 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 89057E24138; Wed, 20 Sep 2017 21:19:55 +0000 (UTC) (envelope-from imp@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 5913680235; Wed, 20 Sep 2017 21:19:55 +0000 (UTC) (envelope-from imp@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v8KLJsFw053794; Wed, 20 Sep 2017 21:19:54 GMT (envelope-from imp@FreeBSD.org) Received: (from imp@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id v8KLJsBR053793; Wed, 20 Sep 2017 21:19:54 GMT (envelope-from imp@FreeBSD.org) Message-Id: <201709202119.v8KLJsBR053793@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: imp set sender to imp@FreeBSD.org using -f From: Warner Losh Date: Wed, 20 Sep 2017 21:19:53 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r323829 - head/sys/cam X-SVN-Group: head X-SVN-Commit-Author: imp X-SVN-Commit-Paths: head/sys/cam X-SVN-Commit-Revision: 323829 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: 2.1.23 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, 20 Sep 2017 21:19:55 -0000 Author: imp Date: Wed Sep 20 21:19:53 2017 New Revision: 323829 URL: https://svnweb.freebsd.org/changeset/base/323829 Log: cam iosched: Add a handler for the quanta sysctl to enforce valid values Invalid values can result in devision-by-zero panics or other undefined behaviour so lets not allow them. PR: 221957 Obtained from: ElectroBSD Submitted by: Fabian Keil Differential Revision: https://reviews.freebsd.org/D12351 Modified: head/sys/cam/cam_iosched.c Modified: head/sys/cam/cam_iosched.c ============================================================================== --- head/sys/cam/cam_iosched.c Wed Sep 20 21:13:20 2017 (r323828) +++ head/sys/cam/cam_iosched.c Wed Sep 20 21:19:53 2017 (r323829) @@ -883,6 +883,27 @@ cam_iosched_sysctl_latencies(SYSCTL_HANDLER_ARGS) return (error); } +static int +cam_iosched_quanta_sysctl(SYSCTL_HANDLER_ARGS) +{ + int *quanta; + int error, value; + + quanta = (unsigned *)arg1; + value = *quanta; + + error = sysctl_handle_int(oidp, (int *)&value, 0, req); + if ((error != 0) || (req->newptr == NULL)) + return (error); + + if (value < 1 || value > hz) + return (EINVAL); + + *quanta = value; + + return (0); +} + static void cam_iosched_iop_stats_sysctl_init(struct cam_iosched_softc *isc, struct iop_stats *ios, char *name) { @@ -1104,9 +1125,9 @@ void cam_iosched_sysctl_init(struct cam_iosched_softc &isc->read_bias, 100, "How biased towards read should we be independent of limits"); - SYSCTL_ADD_INT(ctx, n, - OID_AUTO, "quanta", CTLFLAG_RW, - &isc->quanta, 200, + SYSCTL_ADD_PROC(ctx, n, + OID_AUTO, "quanta", CTLTYPE_UINT | CTLFLAG_RW, + &isc->quanta, 0, cam_iosched_quanta_sysctl, "I", "How many quanta per second do we slice the I/O up into"); SYSCTL_ADD_INT(ctx, n,