Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756291Ab2FJVkp (ORCPT ); Sun, 10 Jun 2012 17:40:45 -0400 Received: from smarthost02.digicable.hu ([94.21.128.7]:45954 "EHLO smarthost02.digicable.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752497Ab2FJVko (ORCPT ); Sun, 10 Jun 2012 17:40:44 -0400 Message-ID: <4FD5142B.2080809@freemail.hu> Date: Sun, 10 Jun 2012 23:39:55 +0200 From: =?UTF-8?B?TsOpbWV0aCBNw6FydG9u?= User-Agent: Mozilla/5.0 (X11; U; Linux i686; hu-HU; rv:1.8.1.21) Gecko/20090402 SeaMonkey/1.1.16 MIME-Version: 1.0 To: David Airlie , Daniel Vetter , Dave Airlie , dri-devel@lists.freedesktop.org CC: linux-kernel@vger.kernel.org Subject: [PATCH] drm via: initialize object_idr Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Original: 84.236.6.17 X-Original: 92.249.128.185 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2201 Lines: 51 From: Márton Németh The field obejct_idr of struct drm_via_private was introduced with the commit http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=77ee8f3825054f23b17e9c8f728f061defd86cdc . In that patch idr_init(&dev->object_name_idr) was called instead of idr_init(&dev_priv->object_idr) by mistake, leaving the dev_priv->object_idr uninitialized. To be more exact, the object_idr buffer is filled with zeros because of kzalloc(), but the dev_priv->object_idr.lock spinlock can cause system freeze at lib/idr.c:move_to_free_list() when spin_lock_irqsave() is called on this spinlock. The patch was tested on Clevo D4J, model D410J laptop, on the following hardware, without AGP kernel module loaded: # lspci -s 01:00.0 -n 01:00.0 0300: 1106:3108 (rev 01) # lspci -s 01:00.0 -v 01:00.0 VGA compatible controller: VIA Technologies, Inc. K8M800/K8N800/K8N800A [S3 UniChrome Pro] (rev 01) (prog-if 00 [VGA controller]) Subsystem: CLEVO/KAPOK Computer Device 4702 Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 16 Memory at f0000000 (32-bit, prefetchable) [size=64M] Memory at d1000000 (32-bit, non-prefetchable) [size=16M] Expansion ROM at [disabled] Capabilities: [60] Power Management version 2 Capabilities: [70] AGP version 3.0 Signed-off-by: Márton Németh --- diff --git a/drivers/gpu/drm/via/via_map.c b/drivers/gpu/drm/via/via_map.c index 1f18225..c126182 100644 --- a/drivers/gpu/drm/via/via_map.c +++ b/drivers/gpu/drm/via/via_map.c @@ -100,12 +100,11 @@ int via_driver_load(struct drm_device *dev, unsigned long chipset) if (dev_priv == NULL) return -ENOMEM; + idr_init(&dev_priv->object_idr); dev->dev_private = (void *)dev_priv; dev_priv->chipset = chipset; - idr_init(&dev->object_name_idr); - pci_set_master(dev->pdev); ret = drm_vblank_init(dev, 1); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/