From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lin Ming Subject: [RFC][PATCH 3/4] ata: runtime suspend port if no device attached Date: Thu, 15 Dec 2011 21:12:48 +0800 Message-ID: <1323954769-3918-4-git-send-email-ming.m.lin@intel.com> References: <1323954769-3918-1-git-send-email-ming.m.lin@intel.com> Return-path: Received: from mga02.intel.com ([134.134.136.20]:11990 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756011Ab1LONOt (ORCPT ); Thu, 15 Dec 2011 08:14:49 -0500 In-Reply-To: <1323954769-3918-1-git-send-email-ming.m.lin@intel.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Jeff Garzik , Alan Stern , Tejun Heo Cc: linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org, linux-pm@vger.kernel.org, "Rafael J. Wysocki" Add a new function ata_device_probed(...) to check if device was probed. Runtime suspend scsi_host--->ata port if no device was probed. Controller will be runtime suspended if all port are suspended already. Signed-off-by: Lin Ming --- drivers/ata/libata-core.c | 21 ++++++++++++++++++++- 1 files changed, 20 insertions(+), 1 deletions(-) diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 8996758..4bbbd55 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -5934,6 +5934,21 @@ int ata_port_probe(struct ata_port *ap) return rc; } +/** + * ata_device_probed - Check if device is probed + * @ap: port to check + */ +static bool ata_device_probed(struct ata_port *ap) +{ + struct ata_link *link; + struct ata_device *dev; + + ata_for_each_link(link, ap, EDGE) + ata_for_each_dev(dev, link, ENABLED) + return true; + + return false; +} static void async_port_probe(void *data, async_cookie_t cookie) { @@ -5954,7 +5969,11 @@ static void async_port_probe(void *data, async_cookie_t cookie) /* in order to keep device order, we need to synchronize at this point */ async_synchronize_cookie(cookie); - ata_scsi_scan_host(ap, 1); + if (ata_device_probed(ap)) + ata_scsi_scan_host(ap, 1); + else + /* Runtime suspend it if no device is attached */ + pm_runtime_idle(&ap->scsi_host->shost_gendev); } /** -- 1.7.2.5