diff options
| author | Lan Tianyu <tianyu.lan@intel.com> | 2013-01-23 04:26:32 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-25 10:14:20 -0800 |
| commit | 192fef18d0f5ac9a05a93ff6314fc9865c10fbf9 (patch) | |
| tree | 200d5fb4bf44c30f3fd12d427e34d796ee9cc0d1 /drivers/usb | |
| parent | f6cced1a08b475c5ac946823bb057714be7af4f6 (diff) | |
usb: enable usb port device's async suspend.
This patch is to set power.async_suspend for usb port in order
to allow it 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: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/core/port.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c index 9a15b26944e..5df143dbd75 100644 --- a/drivers/usb/core/port.c +++ b/drivers/usb/core/port.c @@ -186,6 +186,7 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1) PM_QOS_FLAG_NO_POWER_OFF)) pm_runtime_enable(&port_dev->dev); + device_enable_async_suspend(&port_dev->dev); retval = usb_acpi_register_power_resources(&port_dev->dev); if (retval && retval != -ENODEV) |