diff options
| author | Octavian Purdila <octavian.purdila@intel.com> | 2013-12-23 19:06:31 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-12-31 16:53:51 -0500 |
| commit | 8d88bbffcbac2e7ceba04a9cdff97241b6b5f1db (patch) | |
| tree | 4c78e69f9027583e2a4e812f18489eb8447761a3 | |
| parent | 2205369a314e12fcec4781cc73ac9c08fc2b47de (diff) | |
| download | linux-xtensa-8d88bbffcbac2e7ceba04a9cdff97241b6b5f1db.tar.gz | |
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>
| -rw-r--r-- | drivers/net/usb/mcs7830.c | 19 |
1 files changed, 4 insertions, 15 deletions
diff --git a/drivers/net/usb/mcs7830.c b/drivers/net/usb/mcs7830.c index 03832d3780aa61..f54637828574f6 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"; @@ -561,26 +560,16 @@ 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 = { |