Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755929Ab2FZJSS (ORCPT ); Tue, 26 Jun 2012 05:18:18 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:43378 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1755159Ab2FZJSQ (ORCPT ); Tue, 26 Jun 2012 05:18:16 -0400 X-IronPort-AV: E=Sophos;i="4.77,476,1336320000"; d="scan'208";a="5266095" Message-ID: <4FE97F60.90101@cn.fujitsu.com> Date: Tue, 26 Jun 2012 17:22:40 +0800 From: Wen Congyang User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100413 Fedora/3.0.4-2.fc13 Thunderbird/3.0.4 MIME-Version: 1.0 To: lenb@kernel.org, linux-acpi@vger.kernel.org, "linux-kernel@vger.kernel.org" CC: Yasuaki ISIMATU Subject: [PATCH 7/8] auto bind the memory device which is hotpluged before the driver is loaded References: <4FE97DD5.6030205@cn.fujitsu.com> In-Reply-To: <4FE97DD5.6030205@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/06/26 17:18:26, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/06/26 17:18:28, Serialize complete at 2012/06/26 17:18:28 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2630 Lines: 79 If the memory device is hotpluged before the driver is loaded, the user cannot see this device under the directory /sys/bus/acpi/devices/, and the user cannot bind it by hand after the driver is loaded. This patch introduces a new feature to bind such device when is driver is being loaded. Signed-off-by: Wen Congyang --- drivers/acpi/acpi_memhotplug.c | 37 ++++++++++++++++++++++++++++++++++++- 1 files changed, 36 insertions(+), 1 deletions(-) diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c index 148c88a..a682657 100644 --- a/drivers/acpi/acpi_memhotplug.c +++ b/drivers/acpi/acpi_memhotplug.c @@ -52,6 +52,9 @@ MODULE_LICENSE("GPL"); #define MEMORY_POWER_ON_STATE 1 #define MEMORY_POWER_OFF_STATE 2 +static bool auto_probe; +module_param(auto_probe, bool, S_IRUGO | S_IWUSR); + static int acpi_memory_device_add(struct acpi_device *device); static int acpi_memory_device_remove(struct acpi_device *device, int type); @@ -515,12 +518,44 @@ acpi_memory_register_notify_handler(acpi_handle handle, u32 level, void *ctxt, void **retv) { acpi_status status; - + struct acpi_memory_device *mem_device = NULL; + unsigned long long current_status; status = is_memory_device(handle); if (ACPI_FAILURE(status)) return AE_OK; /* continue */ + if (auto_probe) { + if (acpi_memory_get_device(handle, &mem_device)) + goto install; + + /* Get device present/absent information from the _STA */ + status = acpi_evaluate_integer(mem_device->device->handle, + "_STA", NULL, ¤t_status); + if (ACPI_FAILURE(status)) + goto install; + + /* + * Check for device status. Device should be + * present/enabled/functioning. + */ + if (!((current_status & ACPI_STA_DEVICE_PRESENT) + && (current_status & ACPI_STA_DEVICE_ENABLED) + && (current_status & ACPI_STA_DEVICE_FUNCTIONING))) + goto install; + + /* We have bound this device while we register the dirver */ + if (mem_device->state == MEMORY_POWER_ON_STATE) + goto install; + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "\nauto probe memory device\n")); + + if (acpi_memory_enable_device(mem_device)) + pr_err(PREFIX "Cannot enable memory device\n"); + } + +install: status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, acpi_memory_device_notify, NULL); /* continue */ -- 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/