Legacy interrupt registration in e1000 (em and igb)

[Tibor Vidok]

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Hi Jack and all,

Few month before I've send a PR (see bellow) about interrupt setup in
em driver.
Now I run into the same problem with igb too. It seems that I'm the
one using such an old interrupt mechanism with new chips...

So the problem is that when one tries to register legacy mode
interrupts, NULL is passed to bus_setup_intr as handler.

Jack: Please check my attached path and apply it if you think so.

Original PR was the following:
Number:140728
Category:kern
Synopsis:[em] [patch] Fast irq registration in em driver

Have a nice day,
Tibor
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