[tulip] ADMtek Comet bug

[Dan Hollis]

Linksys v4.0 and v4.1 cards seem to randomly hang on transmit. The cards
will continue to receive packets, just totally unable to
transmit. Unplugging and replugging the RJ45 cable has no effect. An
ifdown/ifup will clear the hang for a while, until it locks up again some
hours/days later.

This is a repeatable bug on 2 completely different machines in completely
different locations connected to completely different networks with
completely different switches:

Athlon K7/700 on KX133 chipset connected to Linksys EZXS55W
Celeron 366 on 440BX chipset connected to SMC EZ-NET 24SW

When the card hangs, the driver prints this over and over:

eth0: Transmit timed out, status fc664010, CSR12 00000000, resetting...

It looks like despite the driver's claim of "resetting", it really doesnt
reset the card. Purely ifdown/ifup will clear the card.

The bug happens with either v0.92 4/17/2000 or v0.92l 8/19/2000 so it is
not related to the driver version.

The kernel version is 2.2.17.

-Dan