From patchwork Wed Oct 24 06:05:49 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tang Chen X-Patchwork-Id: 193687 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 9B69F2C00A6 for ; Wed, 24 Oct 2012 17:07:10 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757621Ab2JXGHJ (ORCPT ); Wed, 24 Oct 2012 02:07:09 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:53191 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1757500Ab2JXGHH (ORCPT ); Wed, 24 Oct 2012 02:07:07 -0400 X-IronPort-AV: E=Sophos;i="4.80,639,1344182400"; d="scan'208";a="6057053" Received: from unknown (HELO tang.cn.fujitsu.com) ([10.167.250.3]) by song.cn.fujitsu.com with ESMTP; 24 Oct 2012 14:05:32 +0800 Received: from fnstmail02.fnst.cn.fujitsu.com (tang.cn.fujitsu.com [127.0.0.1]) by tang.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id q9O6712q020892; Wed, 24 Oct 2012 14:07:01 +0800 Received: from tangchen.fnst.cn.fujitsu.com ([10.167.225.117]) by fnstmail02.fnst.cn.fujitsu.com (Lotus Domino Release 8.5.3) with ESMTP id 2012102414063063-714515 ; Wed, 24 Oct 2012 14:06:30 +0800 From: Tang Chen To: yinghai@kernel.org, bhelgaas@google.com, lenb@kernel.org, jiang.liu@huawei.com, izumi.taku@jp.fujitsu.com, isimatu.yasuaki@jp.fujitsu.com, mihailm@parallels.com, linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/2] Use kacpi_hotplug_wq to handle container hotplug event. Date: Wed, 24 Oct 2012 14:05:49 +0800 Message-Id: <1351058750-4275-2-git-send-email-tangchen@cn.fujitsu.com> X-Mailer: git-send-email 1.7.10.1 In-Reply-To: <1351058750-4275-1-git-send-email-tangchen@cn.fujitsu.com> References: <1351058750-4275-1-git-send-email-tangchen@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/10/24 14:06:30, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/10/24 14:06:31, Serialize complete at 2012/10/24 14:06:31 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org As the comments in __acpi_os_execute() said: We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq because the hotplug code may call driver .remove() functions, which invoke flush_scheduled_work/acpi_os_wait_events_complete to flush these workqueues. we should keep the hotplug code in kacpi_hotplug_wq. But we have the following call series in kernel now: acpi_ev_queue_notify_request() |--> acpi_os_execute() |--> __acpi_os_execute(type, function, context, 0) The last parameter 0 makes the container_notify_cb() executed in kacpi_notify_wq or kacpid_wq. So, we need to put the real hotplug code into kacpi_hotplug_wq. Signed-off-by: Tang Chen --- drivers/acpi/container.c | 17 ++++++++++++++++- 1 files changed, 16 insertions(+), 1 deletions(-) diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c index 69e2d6b..d300e03 100644 --- a/drivers/acpi/container.c +++ b/drivers/acpi/container.c @@ -35,6 +35,7 @@ #include #include #include +#include #define PREFIX "ACPI: " @@ -165,14 +166,21 @@ static int container_device_add(struct acpi_device **device, acpi_handle handle) return result; } -static void container_notify_cb(acpi_handle handle, u32 type, void *context) +static void __container_notify_cb(struct work_struct *work) { struct acpi_device *device = NULL; int result; int present; acpi_status status; + struct acpi_hp_work *hp_work; + acpi_handle handle; + u32 type; u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */ + hp_work = container_of(work, struct acpi_hp_work, work); + handle = hp_work->handle; + type = hp_work->type; + switch (type) { case ACPI_NOTIFY_BUS_CHECK: /* Fall through */ @@ -224,6 +232,13 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context) return; } +static void container_notify_cb(acpi_handle handle, u32 type, + void *context) +{ + alloc_acpi_hp_work(handle, type, context, + __container_notify_cb); +} + static acpi_status container_walk_namespace_cb(acpi_handle handle, u32 lvl, void *context, void **rv)