Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760148AbZJIBSI (ORCPT ); Thu, 8 Oct 2009 21:18:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757814AbZJIBSG (ORCPT ); Thu, 8 Oct 2009 21:18:06 -0400 Received: from mx1.redhat.com ([209.132.183.28]:8158 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755814AbZJIBSF (ORCPT ); Thu, 8 Oct 2009 21:18:05 -0400 Message-ID: <4ACE8EF5.5050707@redhat.com> Date: Fri, 09 Oct 2009 09:16:37 +0800 From: Danny Feng User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.1) Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Thunderbird/3.0b3 MIME-Version: 1.0 To: Alex Chiang CC: lenb@kernel.org, bjorn.helgaas@hp.com, andrew.patterson@hp.com, jbarnes@virtuousgeek.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] acpi: pci_root: fix NULL pointer deref after resume from suspend References: <1254119480-9730-1-git-send-email-dfeng@redhat.com> <20090928173819.GA2441@ldl.fc.hp.com> <4AC16682.50207@redhat.com> <20091001200522.GF31915@ldl.fc.hp.com> In-Reply-To: <20091001200522.GF31915@ldl.fc.hp.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4143 Lines: 110 On 10/02/2009 04:05 AM, Alex Chiang wrote: > Hi Danny, > > * Danny Feng: > >> Call Trace: >> [] acpi_get_pci_dev+0x106/0x167 >> [] acpi_pci_bind+0x1c/0x86 >> [] ? sysfs_create_file+0x2a/0x2c >> [] acpi_add_single_object+0x964/0xa0c >> [] acpi_bus_check_add+0xe0/0x138 >> [] acpi_bus_scan+0x68/0xa0 >> [] acpi_bus_add+0x2a/0x2e >> [] hotplug_dock_devices+0x114/0x13e >> [] acpi_dock_deferred_cb+0xbf/0x192 >> [] acpi_os_execute_deferred+0x29/0x36 >> [] worker_thread+0x251/0x347 >> [] ? worker_thread+0x1fc/0x347 >> [] ? acpi_os_execute_deferred+0x0/0x36 >> [] ? autoremove_wake_function+0x0/0x39 >> [] ? worker_thread+0x0/0x347 >> [] kthread+0x7f/0x87 >> [] child_rip+0xa/0x20 >> [] ? restore_args+0x0/0x30 >> [] ? kthread+0x0/0x87 >> [] ? child_rip+0x0/0x20 >> Code: ff 49 89 fc 41 89 f5 a9 00 ff ff 07 74 11 be 87 00 00 00 48 c7 c7 >> 45 6d 5a 81 e8 f6 2b e3 ff 48 c7 c7 30 ab 68 81 e8 29 77 20 00<49> 8b >> 5c 24 28 49 83 c4 28 eb 09 44 39 6b 38 74 10 48 89 c3 48 >> RIP [] pci_get_slot+0x4c/0x8c >> RSP >> CR2: 0000000000000028 >> ---[ end trace b5a7793bd9db2a4d ]--- >> > Can you please reproduce with this debug patch? I'm guessing that > we're dying because we have a NULL parent device, but I'm curious > as to what causes this situation to occur. > > Thanks. > /ac > --- > diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c > index 7338b6a..4c1b128 100644 > --- a/drivers/acpi/dock.c > +++ b/drivers/acpi/dock.c > @@ -126,6 +126,7 @@ add_dock_dependent_device(struct dock_station *ds, > { > spin_lock(&ds->dd_lock); > list_add_tail(&dd->list,&ds->dependent_devices); > + printk("%s adding handle %p\n", __func__, dd->handle); > spin_unlock(&ds->dd_lock); > } > > @@ -142,6 +143,8 @@ dock_add_hotplug_device(struct dock_station *ds, > { > mutex_lock(&ds->hp_lock); > list_add_tail(&dd->hotplug_list,&ds->hotplug_devices); > + dump_stack(); > + printk("%s adding handle %p\n", __func__, dd->handle); > mutex_unlock(&ds->hp_lock); > } > > @@ -325,14 +328,17 @@ static struct acpi_device * dock_create_acpi_device(acpi_handle handle) > acpi_handle parent; > int ret; > > + printk("%s handle %p\n", __func__, handle); > if (acpi_bus_get_device(handle,&device)) { > /* > * no device created for this object, > * so we should create one. > */ > acpi_get_parent(handle,&parent); > - if (acpi_bus_get_device(parent,&parent_device)) > + if (acpi_bus_get_device(parent,&parent_device)) { > parent_device = NULL; > + printk("%s no parent, setting NULL\n", __func__); > + } > > ret = acpi_bus_add(&device, parent_device, handle, > ACPI_BUS_TYPE_DEVICE); > @@ -385,8 +391,10 @@ static void hotplug_dock_devices(struct dock_station *ds, u32 event) > * First call driver specific hotplug functions > */ > list_for_each_entry(dd,&ds->hotplug_devices, hotplug_list) { > - if (dd->ops&& dd->ops->handler) > + if (dd->ops&& dd->ops->handler) { > + printk("%s handle %p\n", __func__, dd->handle); > dd->ops->handler(dd->handle, event, dd->context); > + } > } > > /* > @@ -1041,6 +1049,7 @@ static int dock_add(acpi_handle handle) > ret = -ENOMEM; > goto dock_add_err_unregister; > } > + printk("%s adding self as dependent %p)\n", __func__, dd->handle); > add_dock_dependent_device(dock_station, dd); > > dock_station_count++; > > Sorry for the late response, just back from holidays. Will do it soon, thanks. -- 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/