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usbnet: mcs7830: rework link state detection

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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>
This commit is contained in:
Octavian Purdila 2013-12-23 19:06:31 +02:00 committed by David S. Miller
parent 2205369a31
commit 8d88bbffcb
1 changed files with 4 additions and 15 deletions
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19
drivers/net/usb/mcs7830.c
View file

@ -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 = {