[RFC PATCH v1 1/3] usbnet: introduce usbnet_link_change API

Ming Lei
2012-09-18T14:23:51Z

This patch introduces the API of usbnet_link_change, so that
usbnet can trace the link change, which may help to implement
the later runtime PM triggered by usb ethernet link change.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
---
drivers/net/usb/usbnet.c | 13 ++++++++++++-
include/linux/usb/usbnet.h | 2 +-
2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index e944109..e986e4b 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -677,6 +677,18 @@ static void usbnet_terminate_urbs(struct usbnet *dev)
remove_wait_queue(&unlink_wakeup, &wait);
}

+void usbnet_link_change(struct usbnet *dev, int link, int need_reset)
+{
+ if (link)
+ netif_carrier_on(dev->net);
+ else
+ netif_carrier_off(dev->net);
+
+ if (need_reset && link)
+ usbnet_defer_kevent(dev, EVENT_LINK_RESET);
+}
+EXPORT_SYMBOL(usbnet_link_change);
+
int usbnet_stop (struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
@@ -1591,7 +1603,6 @@ int usbnet_resume (struct usb_interface *intf)
}
EXPORT_SYMBOL_GPL(usbnet_resume);

-
/*-------------------------------------------------------------------------*/

static int __init usbnet_init(void)
diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h
index f87cf62..1937b74 100644
--- a/include/linux/usb/usbnet.h
+++ b/include/linux/usb/usbnet.h
@@ -160,7 +160,7 @@ extern int usbnet_probe(struct usb_interface *, const struct usb_device_id *);
extern int usbnet_suspend(struct usb_interface *, pm_message_t);
extern int usbnet_resume(struct usb_interface *);
extern void usbnet_disconnect(struct usb_interface *);
-
+extern void usbnet_link_change(struct usbnet *dev, int link, int need_reset);

/* Drivers that reuse some of the standard USB CDC infrastructure
* (notably, using multiple interfaces according to the CDC
--
1.7.9.5