Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932899Ab2JWNL4 (ORCPT ); Tue, 23 Oct 2012 09:11:56 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:21036 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1756903Ab2JWNLy (ORCPT ); Tue, 23 Oct 2012 09:11:54 -0400 X-IronPort-AV: E=Sophos;i="4.80,635,1344182400"; d="scan'208";a="6052696" 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, linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] Use kacpi_hotplug_wq to handle container hotplug event. Date: Tue, 23 Oct 2012 21:10:38 +0800 Message-Id: <1350997839-13260-2-git-send-email-tangchen@cn.fujitsu.com> X-Mailer: git-send-email 1.7.10.1 In-Reply-To: <1350997839-13260-1-git-send-email-tangchen@cn.fujitsu.com> References: <1350997839-13260-1-git-send-email-tangchen@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/10/23 21:11:11, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/10/23 21:11:12, Serialize complete at 2012/10/23 21:11:12 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3171 Lines: 109 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 | 44 +++++++++++++++++++++++++++++++++++++++++++- 1 files changed, 43 insertions(+), 1 deletions(-) diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c index 1f9f7d7..643657a 100644 --- a/drivers/acpi/container.c +++ b/drivers/acpi/container.c @@ -72,8 +72,36 @@ static struct acpi_driver acpi_container_driver = { }, }; +struct acpi_container_hp_work { + struct work_struct work; + acpi_handle handle; + u32 type; + void *context; +}; + /*******************************************************************/ +static void alloc_acpi_container_hp_work(acpi_handle handle, u32 type, + void *context, + void (*func)(struct work_struct *work)) +{ + struct acpi_container_hp_work *hp_work; + int ret; + + hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL); + if (!hp_work) + return; + + hp_work->handle = handle; + hp_work->type = type; + hp_work->context = context; + + INIT_WORK(&hp_work->work, func); + ret = queue_work(kacpi_hotplug_wq, &hp_work->work); + if (!ret) + kfree(hp_work); +} + static int is_device_present(acpi_handle handle) { acpi_handle temp; @@ -152,14 +180,21 @@ 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_container_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_container_hp_work, work); + handle = hp_work->handle; + type = hp_work->type; + switch (type) { case ACPI_NOTIFY_BUS_CHECK: /* Fall through */ @@ -211,6 +246,13 @@ 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_container_hp_work(handle, type, context, + __container_notify_cb); +} + static acpi_status container_walk_namespace_cb(acpi_handle handle, u32 lvl, void *context, void **rv) -- 1.7.1 -- 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/