[PATCH][BUGFIX][2.4.21] Fix PPC4xx Ethernet problem

[KISHINAMI Masaya]

Dear maintainers;

Attached file is effective the failure not to generate the receive
completion interruption from EMAC to 405GP On-chip LAN device driver.
The failure condition is as follows.

- custom board designed based on the 405GP
- kernel 2.4.18
- 2.4.21 pre3 ibm_ocp LAN device driver and ported it to
  work on kernel 2.4.18
- repeater hub(10Mbps, half duplex)
- line is much loaded

The modification was applied from 2.4.21 pre3.
Please see the follows URL. It describes in detail.
http://lists.linuxppc.org/linuxppc-embedded/200304/msg00171.html
Please apply attached file.

Regards, Kishinami

-----
KISHINAMI Masaya
Fujitsu Limited (Japan)
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