From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753545AbaJMKSz (ORCPT ); Mon, 13 Oct 2014 06:18:55 -0400 Received: from mga01.intel.com ([192.55.52.88]:26282 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753080AbaJMKSy (ORCPT ); Mon, 13 Oct 2014 06:18:54 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.04,709,1406617200"; d="scan'208";a="613554421" Date: Mon, 13 Oct 2014 13:18:50 +0300 From: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= To: Fengguang Wu Cc: LKML , lkp@01.org, Intel Graphics Development Subject: Re: [drm/i915] 5ba60fc3d71: dmesg.WARNING:at_drivers/gpu/drm/i915/intel_pm.c:sandybridge_pcode_write_i915() Message-ID: <20141013101850.GA4284@intel.com> References: <20141011052935.GE21803@wfg-t540p.sh.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20141011052935.GE21803@wfg-t540p.sh.intel.com> User-Agent: Mutt/1.5.22 (2013-10-16) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Oct 11, 2014 at 01:29:35PM +0800, Fengguang Wu wrote: > FYI, we noticed the below changes on > > git://gitorious.org/vsyrjala/linux cdclk_3 > commit 5ba60fc3d719988a404d35a3e46f109bea643fef ("drm/i915: BDW cdclk change support") > > > [ 13.959092] WARNING: CPU: 0 PID: 75 at drivers/gpu/drm/i915/intel_pm.c:6231 sandybridge_pcode_write+0x171/0x190 [i915]() > [ 13.959112] Modules linked in: snd_hda_intel i915 snd_hda_controller snd_hda_codec snd_hwdep snd_pcm drm_kms_helper snd_timer snd winbond_cir drm soundcore ahci libahci rc_core pcspkr i2c_i801 libata parport_pc parport i2c_hid sdhci_acpi sdhci mmc_core video dw_dmac dw_dmac_core acpi_pad > [ 13.959115] CPU: 0 PID: 75 Comm: kworker/u16:1 Not tainted 3.17.0-rc7-g5ba60fc #1 > [ 13.959116] Hardware name: Intel Corporation Broadwell Client platform/WhiteTip Mountain 1, BIOS BDW-E1R1.86C.0079.R00.1406020127 06/02/2014 > [ 13.959122] Workqueue: events_unbound async_run_entry_fn > [ 13.959126] 0000000000000009 ffff880092cbb850 ffffffff818570a6 0000000000000000 > [ 13.959129] ffff880092cbb888 ffffffff8106ef1d ffff88014d380000 0000000000000000 > [ 13.959131] 0000000000000018 ffff88014dc862f0 ffff88014d380000 ffff880092cbb898 > [ 13.959132] Call Trace: > [ 13.959137] [] dump_stack+0x4d/0x66 > [ 13.959142] [] warn_slowpath_common+0x7d/0xa0 > [ 13.959145] [] warn_slowpath_null+0x1a/0x20 > [ 13.959173] [] sandybridge_pcode_write+0x171/0x190 [i915] > [ 13.959212] [] haswell_modeset_global_resources+0x196/0x4a0 [i915] Thanks for the report. Seems I forgot to grab the relevant lock here. Fixed patches pushed to cdclk_4 branch. -- Ville Syrjälä Intel OTC