Hi, Currently only very few usbnet devices support the traffic based runtime PM, eg. wake up devices if there are packets to be transmitted. For the below situation, it should make sense to runtime suspend usbnet device to save power: - after network link becomes down This patch implements the runtime PM triggered by network link change event, and it works basically on asix usbnet device after a simple runtime PM test. Change Log: v1: -- use system_freezable_wq to fix deadlock by calling usbnet_link_updated in same workqueue -- use system_freezable_wq to stop link check work during system sleep -- fix bug of possible change of previous autosuspend_delay -- set/clear 'needs_remote_wakeup' for devices which support remote wakeup on link change -- convert EXPORT_SYMBOL_GPL to EXPORT_SYMBOL -- introduce module parameter of link_autocheck_time -- introduce link_rpm_supported to not start link runtime PM for devices which can't detect link change (such as smsc95xx) Thanks for Oliver's review. drivers/net/usb/asix_devices.c | 6 +- drivers/net/usb/cdc_ether.c | 5 +- drivers/net/usb/cdc_ncm.c | 9 +- drivers/net/usb/dm9601.c | 7 +- drivers/net/usb/mcs7830.c | 6 +- drivers/net/usb/sierra_net.c | 6 +- drivers/net/usb/usbnet.c | 280 +++++++++++++++++++++++++++++++++++++++- include/linux/usb/usbnet.h | 22 +++- 8 files changed, 306 insertions(+), 35 deletions(-) Thanks, -- Ming Lei -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
