From owner-svn-src-stable-10@FreeBSD.ORG Sun Jan 25 08:16:52 2015 Return-Path: Delivered-To: svn-src-stable-10@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id E35E0243; Sun, 25 Jan 2015 08:16:52 +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 CE2C63B9; Sun, 25 Jan 2015 08:16:52 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.9/8.14.9) with ESMTP id t0P8GqwX018001; Sun, 25 Jan 2015 08:16:52 GMT (envelope-from cperciva@FreeBSD.org) Received: (from cperciva@localhost) by svn.freebsd.org (8.14.9/8.14.9/Submit) id t0P8GqsK018000; Sun, 25 Jan 2015 08:16:52 GMT (envelope-from cperciva@FreeBSD.org) Message-Id: <201501250816.t0P8GqsK018000@svn.freebsd.org> X-Authentication-Warning: svn.freebsd.org: cperciva set sender to cperciva@FreeBSD.org using -f From: Colin Percival Date: Sun, 25 Jan 2015 08:16:52 +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: r277692 - stable/10/sys/dev/acpica 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: Sun, 25 Jan 2015 08:16:53 -0000 Author: cperciva Date: Sun Jan 25 08:16:51 2015 New Revision: 277692 URL: https://svnweb.freebsd.org/changeset/base/277692 Log: MFC r277318: When disabling C3+ CPU states due to the CPU_QUIRK_NO_C3 quirk, don't accidentally enable non-existent states. This bug was triggered if ACPI advertises the presence of a C2 state which we fail to parse via acpi_PkgGas due to our lack of support for FFixedHW resources, and causes an immediate panic when an attempt is made to enter the (NULL) state. One affected platform is the EC2 c4.8xlarge VM instance type; there may be others. Modified: stable/10/sys/dev/acpica/acpi_cpu.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/dev/acpica/acpi_cpu.c ============================================================================== --- stable/10/sys/dev/acpica/acpi_cpu.c Sun Jan 25 06:05:55 2015 (r277691) +++ stable/10/sys/dev/acpica/acpi_cpu.c Sun Jan 25 08:16:51 2015 (r277692) @@ -872,7 +872,7 @@ acpi_cpu_startup(void *arg) for (i = 0; i < cpu_ndevices; i++) { sc = device_get_softc(cpu_devices[i]); if (cpu_quirks & CPU_QUIRK_NO_C3) { - sc->cpu_cx_count = sc->cpu_non_c3 + 1; + sc->cpu_cx_count = min(sc->cpu_cx_count, sc->cpu_non_c3 + 1); } AcpiInstallNotifyHandler(sc->cpu_handle, ACPI_DEVICE_NOTIFY, acpi_cpu_notify, sc);