[PATCH] forcedeth: TX handler changes (experimental)

Hi,

Attached is a patch that modifies the tx interrupt handling of thenForce nic. It's part of the attempts to figure out what causes the nichangs (see bug 4552).The change is experimental: It affects all nForce versions. I've testedit on my nForce 250-Gb.

Please test it. And especially: If you experince a nic hang, please sendme the debug output. That's the block starting with


<<
NETDEV WATCHDOG: eth1: transmit timed out
eth1: Got tx_timeout. irq: 00000000
eth1: Ring at  ...
<<

Thanks,
   Manfred
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