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usbnet: introduce usbnet_link_change API 

This patch introduces the API of usbnet_link_change, so that
usbnet can handle link change centrally, which may help to
implement killing traffic URBs for saving USB bus bandwidth
and host controller power.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ming Lei 2013-04-11 04:40:30 +00:00 committed by David S. Miller
parent 763eff57de
commit ac64995da8
2 changed files with 14 additions and 0 deletions
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13
drivers/net/usb/usbnet.c
View File

@ -1653,6 +1653,19 @@ int usbnet_manage_power(struct usbnet *dev, int on)
}
EXPORT_SYMBOL(usbnet_manage_power);
void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
{
/* update link after link is reseted */
if (link && !need_reset)
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);
/*-------------------------------------------------------------------------*/
static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
u16 value, u16 index, void *data, u16 size)

1
include/linux/usb/usbnet.h
View File

@ -245,5 +245,6 @@ extern void usbnet_get_drvinfo(struct net_device *, struct ethtool_drvinfo *);
extern int usbnet_nway_reset(struct net_device *net);
extern int usbnet_manage_power(struct usbnet *, int);
extern void usbnet_link_change(struct usbnet *, bool, bool);
#endif /* __LINUX_USB_USBNET_H */