From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Rafael J. Wysocki" Subject: [PATCH 7/8] PM: Allow USB devices to suspend/resume asynchronously Date: Sun, 24 Jan 2010 00:40:25 +0100 Message-ID: <201001240040.25931.rjw@sisk.pl> References: <201001240033.34253.rjw@sisk.pl> Mime-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from ogre.sisk.pl ([217.79.144.158]:43513 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752878Ab0AWXmB (ORCPT ); Sat, 23 Jan 2010 18:42:01 -0500 In-Reply-To: <201001240033.34253.rjw@sisk.pl> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: LKML Cc: Alan Stern , Linus Torvalds , Linux PCI , pm list , linux-usb@vger.kernel.org, Greg KH , Jesse Barnes , James Bottomley , Linux SCSI , Arjan van de Ven , ACPI Devel Maling List , Len Brown , Nigel Cunningham From: Rafael J. Wysocki Set power.async_suspend for USB devices, endpoints and interfaces, allowing them to be suspended and resumed asynchronously during system sleep transitions. The power.async_suspend flag is also set for devices that don't have suspend or resume callbacks, because otherwise they would make the main suspend/resume thread wait for their "asynchronous" children (during suspend) or parents (during resume), effectively negating the possible gains from executing these devices' suspend and resume callbacks asynchronously. Signed-off-by: Rafael J. Wysocki --- drivers/usb/core/endpoint.c | 1 + drivers/usb/core/hcd-pci.c | 1 + drivers/usb/core/hub.c | 1 + drivers/usb/core/message.c | 1 + 4 files changed, 4 insertions(+) Index: linux-2.6/drivers/usb/core/hub.c =================================================================== --- linux-2.6.orig/drivers/usb/core/hub.c +++ linux-2.6/drivers/usb/core/hub.c @@ -1817,6 +1817,7 @@ int usb_new_device(struct usb_device *ud /* Tell the world! */ announce_device(udev); + device_enable_async_suspend(&udev->dev); /* Register the device. The device driver is responsible * for configuring the device and invoking the add-device * notifier chain (used by usbfs and possibly others). Index: linux-2.6/drivers/usb/core/message.c =================================================================== --- linux-2.6.orig/drivers/usb/core/message.c +++ linux-2.6/drivers/usb/core/message.c @@ -1867,6 +1867,7 @@ free_interfaces: "adding %s (config #%d, interface %d)\n", dev_name(&intf->dev), configuration, intf->cur_altsetting->desc.bInterfaceNumber); + device_enable_async_suspend(&intf->dev); ret = device_add(&intf->dev); if (ret != 0) { dev_err(&dev->dev, "device_add(%s) --> %d\n", Index: linux-2.6/drivers/usb/core/endpoint.c =================================================================== --- linux-2.6.orig/drivers/usb/core/endpoint.c +++ linux-2.6/drivers/usb/core/endpoint.c @@ -186,6 +186,7 @@ int usb_create_ep_devs(struct device *pa ep_dev->dev.parent = parent; ep_dev->dev.release = ep_device_release; dev_set_name(&ep_dev->dev, "ep_%02x", endpoint->desc.bEndpointAddress); + device_enable_async_suspend(&ep_dev->dev); retval = device_register(&ep_dev->dev); if (retval)