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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>
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@ -1653,6 +1653,19 @@ int usbnet_manage_power(struct usbnet *dev, int on)
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}
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EXPORT_SYMBOL(usbnet_manage_power);
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void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
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{
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/* update link after link is reseted */
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if (link && !need_reset)
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netif_carrier_on(dev->net);
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else
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netif_carrier_off(dev->net);
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if (need_reset && link)
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usbnet_defer_kevent(dev, EVENT_LINK_RESET);
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}
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EXPORT_SYMBOL(usbnet_link_change);
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/*-------------------------------------------------------------------------*/
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static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
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u16 value, u16 index, void *data, u16 size)
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@ -245,5 +245,6 @@ extern void usbnet_get_drvinfo(struct net_device *, struct ethtool_drvinfo *);
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extern int usbnet_nway_reset(struct net_device *net);
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extern int usbnet_manage_power(struct usbnet *, int);
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extern void usbnet_link_change(struct usbnet *, bool, bool);
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#endif /* __LINUX_USB_USBNET_H */
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