Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759473AbZF2LMg (ORCPT ); Mon, 29 Jun 2009 07:12:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758445AbZF2LM0 (ORCPT ); Mon, 29 Jun 2009 07:12:26 -0400 Received: from mail-ew0-f210.google.com ([209.85.219.210]:55389 "EHLO mail-ew0-f210.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753601AbZF2LMY (ORCPT ); Mon, 29 Jun 2009 07:12:24 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=sender:message-id:date:from:user-agent:mime-version:to:cc:subject :content-type:content-transfer-encoding; b=p50Xnwo7kpTmmF4hab8ec91f6mWHOBpdTbtifRqoxXqHFDJ+cn22mnsAbPxT1QXEbN tin7akcioMvJX6zHry+o6DEuOTVrA31TUETMblExFVxaAJ487vXCFJOvjvKWBqUbV8lq ug8CUMdKAFD62bkFHsHE0nnP0007MvD9ol3oc= Message-ID: <4A48A196.3060409@tuffmail.co.uk> Date: Mon, 29 Jun 2009 12:12:22 +0100 From: Alan Jenkins User-Agent: Thunderbird 2.0.0.21 (X11/20090318) MIME-Version: 1.0 To: Corentin Chary CC: linux acpi , linux-kernel , "linux-wireless@vger.kernel.org" Subject: [PATCH] eeepc-laptop: fix hot-unplug on resume Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3103 Lines: 103 The patch below fixes a regression introduced by the rfkill rewrite. Please consider it for inclusion in 2.6.31 via the ACPI tree. Thanks Alan --------------------> >From d0265f0bfe63086816d61c69ee4b2dc4cb491d06 Mon Sep 17 00:00:00 2001 From: Alan Jenkins Date: Mon, 29 Jun 2009 09:40:07 +0100 Subject: [PATCH] eeepc-laptop: fix hot-unplug on resume OOPS on resume when the wireless adaptor is disabled during suspend was introduced by "eeepc-laptop: read rfkill soft-blocked state on resume". Unable to handle kernel NULL pointer dereference Process s2disk Tainted: G W IP: klist_put Call trace: ? klist_del ? device_del ? device_unregister ? pci_stop_dev ? pci_stop_bus ? pci_remove_device ? eeepc_rfkill_hotplug [eeepc_laptop] ? eeepc_hotk_resume [eeepc_laptop] ? acpi_device_resume ? device_resume ? hibernation_snapshot It appears the PCI device is removed twice. The eeepc_rfkill_hotplug() call from the resume handler is racing against the call from the ACPI notifier callback. The ACPI notification is triggered by the resume handler when it refreshes the value of CM_ASL_WLAN. The fix is to serialize hotplug calls using a workqueue. Signed-off-by: Alan Jenkins --- drivers/platform/x86/eeepc-laptop.c | 9 ++++++--- 1 files changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/platform/x86/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c index ec560f1..222ffb8 100644 --- a/drivers/platform/x86/eeepc-laptop.c +++ b/drivers/platform/x86/eeepc-laptop.c @@ -143,6 +143,7 @@ struct eeepc_hotk { struct rfkill *bluetooth_rfkill; struct rfkill *wwan3g_rfkill; struct hotplug_slot *hotplug_slot; + struct work_struct hotplug_work; }; /* The actual device the driver binds to */ @@ -660,7 +661,7 @@ static int eeepc_get_adapter_status(struct hotplug_slot *hotplug_slot, return 0; } -static void eeepc_rfkill_hotplug(void) +static void eeepc_hotplug_work(struct work_struct *work) { struct pci_dev *dev; struct pci_bus *bus = pci_find_bus(0, 1); @@ -701,7 +702,7 @@ static void eeepc_rfkill_notify(acpi_handle handle, u32 event, void *data) if (event != ACPI_NOTIFY_BUS_CHECK) return; - eeepc_rfkill_hotplug(); + schedule_work(&ehotk->hotplug_work); } static void eeepc_hotk_notify(struct acpi_device *device, u32 event) @@ -892,7 +893,7 @@ static int eeepc_hotk_resume(struct acpi_device *device) rfkill_set_sw_state(ehotk->wlan_rfkill, wlan != 1); - eeepc_rfkill_hotplug(); + schedule_work(&ehotk->hotplug_work); } if (ehotk->bluetooth_rfkill) @@ -1093,6 +1094,8 @@ static int eeepc_rfkill_init(struct device *dev) { int result = 0; + INIT_WORK(&ehotk->hotplug_work, eeepc_hotplug_work); + eeepc_register_rfkill_notifier("\\_SB.PCI0.P0P6"); eeepc_register_rfkill_notifier("\\_SB.PCI0.P0P7"); -- 1.6.3.2 -- 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/