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authorRafael J. Wysocki <rjw@sisk.pl>2010-02-08 19:18:16 +0100
committerRafael J. Wysocki <rjw@sisk.pl>2010-02-26 20:39:12 +0100
commit927bc9165d3cd01054b472f9b25d91a8707209c8 (patch)
treece0278e5f7acd62da2c3c7e66b205c8542cb0f62 /drivers/usb/core
parent6d19c009cc780c63de25a046509ebc9473809fd6 (diff)
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>
Diffstat (limited to 'drivers/usb/core')
-rw-r--r--drivers/usb/core/endpoint.c1
-rw-r--r--drivers/usb/core/hub.c1
-rw-r--r--drivers/usb/core/message.c1
3 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/core/endpoint.c b/drivers/usb/core/endpoint.c
index fdfaa788551..d26b9ea981f 100644
--- a/drivers/usb/core/endpoint.c
+++ b/drivers/usb/core/endpoint.c
@@ -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)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 35cc8b9ba1f..20ecb4cec8d 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -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).
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 9bc95fec793..df73574a9cc 100644
--- a/drivers/usb/core/message.c
+++ b/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",