+From 4e9792dc8ab29175295c79c35f9f6fbd2d453b35 Mon Sep 17 00:00:00 2001
+From: Octavian Purdila <octavian.purdila@intel.com>
+Date: Mon, 23 Dec 2013 19:06:31 +0200
+Subject: [PATCH] usbnet: mcs7830: rework link state detection
+
+Even with the quirks in commit dabdaf0c (mcs7830: Fix link state
+detection) there are still spurious link-down events for some chips
+where the false link-down events count go over a few hundreds.
+
+This patch takes a more conservative approach and only looks at
+link-down events where the link-down state is not combined with other
+states (e.g. half/full speed, pending frames in SRAM or TX status
+information valid). In all other cases we assume the link is up.
+
+Tested on MCS7830CV-DA (USB ID 9710:7830).
+
+Cc: Ondrej Zary <linux@rainbow-software.org>
+Cc: Michael Leun <lkml20120218@newton.leun.net>
+Cc: Ming Lei <ming.lei@canonical.com>
+Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/usb/mcs7830.c | 19 ++++---------------
+ 1 file changed, 4 insertions(+), 15 deletions(-)
+
+diff --git a/drivers/net/usb/mcs7830.c b/drivers/net/usb/mcs7830.c
+index 9237c45..8dd48b5 100644
+--- a/drivers/net/usb/mcs7830.c
++++ b/drivers/net/usb/mcs7830.c
+@@ -117,7 +117,6 @@ enum {
+ struct mcs7830_data {
+ u8 multi_filter[8];
+ u8 config;
+- u8 link_counter;
+ };
+
+ static const char driver_name[] = "MOSCHIP usb-ethernet driver";
+@@ -562,26 +561,16 @@ static void mcs7830_status(struct usbnet *dev, struct urb *urb)
+ {
+ u8 *buf = urb->transfer_buffer;
+ bool link, link_changed;
+- struct mcs7830_data *data = mcs7830_get_data(dev);
+
+ if (urb->actual_length < 16)
+ return;
+
+- link = !(buf[1] & 0x20);
++ link = !(buf[1] == 0x20);
+ 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;
+- usbnet_link_change(dev, link, 0);
+- netdev_dbg(dev->net, "Link Status is: %d\n", link);
+- }
+- } else
+- data->link_counter = 0;
++ usbnet_link_change(dev, link, 0);
++ netdev_dbg(dev->net, "Link Status is: %d\n", link);
++ }
+ }
+
+ static const struct driver_info moschip_info = {
+--
+2.0.0
+