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Commit 927bc916 authored Feb 08, 2010 by Rafael J. Wysocki

PM: Allow USB devices to suspend/resume asynchronously



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 <rjw@sisk.pl>

parent 6d19c009

drivers/usb/core/endpoint.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -186,6 +186,7 @@ int usb_create_ep_devs(struct device *parent,
		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)

drivers/usb/core/hub.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -1817,6 +1817,7 @@ int usb_new_device(struct usb_device *udev)
		/* 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).

drivers/usb/core/message.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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",