forked from Minki/linux
mcs7830: Fix link state detection
The device had an undocumented "feature": it can provide a sequence of spurious link-down status data even if the link is up all the time. A sequence of 10 was seen so update the link state only after the device reports the same link state 20 times. Signed-off-by: Ondrej Zary <linux@rainbow-software.org> Reported-by: Michael Leun <lkml20120218@newton.leun.net> Tested-by: Michael Leun <lkml20120218@newton.leun.net> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
93ac0ef016
commit
dabdaf0caa
@ -117,6 +117,7 @@ enum {
|
||||
struct mcs7830_data {
|
||||
u8 multi_filter[8];
|
||||
u8 config;
|
||||
u8 link_counter;
|
||||
};
|
||||
|
||||
static const char driver_name[] = "MOSCHIP usb-ethernet driver";
|
||||
@ -632,20 +633,31 @@ static int mcs7830_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
|
||||
static void mcs7830_status(struct usbnet *dev, struct urb *urb)
|
||||
{
|
||||
u8 *buf = urb->transfer_buffer;
|
||||
bool link;
|
||||
bool link, link_changed;
|
||||
struct mcs7830_data *data = mcs7830_get_data(dev);
|
||||
|
||||
if (urb->actual_length < 16)
|
||||
return;
|
||||
|
||||
link = !(buf[1] & 0x20);
|
||||
if (netif_carrier_ok(dev->net) != link) {
|
||||
if (link) {
|
||||
netif_carrier_on(dev->net);
|
||||
usbnet_defer_kevent(dev, EVENT_LINK_RESET);
|
||||
} else
|
||||
netif_carrier_off(dev->net);
|
||||
netdev_dbg(dev->net, "Link Status is: %d\n", link);
|
||||
}
|
||||
link_changed = netif_carrier_ok(dev->net) != link;
|
||||
if (link_changed) {
|
||||
data->link_counter++;
|
||||
/*
|
||||
track link state 20 times to guard against erroneous
|
||||
link state changes reported sometimes by the chip
|
||||
*/
|
||||
if (data->link_counter > 20) {
|
||||
data->link_counter = 0;
|
||||
if (link) {
|
||||
netif_carrier_on(dev->net);
|
||||
usbnet_defer_kevent(dev, EVENT_LINK_RESET);
|
||||
} else
|
||||
netif_carrier_off(dev->net);
|
||||
netdev_dbg(dev->net, "Link Status is: %d\n", link);
|
||||
}
|
||||
} else
|
||||
data->link_counter = 0;
|
||||
}
|
||||
|
||||
static const struct driver_info moschip_info = {
|
||||
|
Loading…
Reference in New Issue
Block a user