linuxppc_2_4_devel patch for enable_irq()

[benh at kernel.crashing.org]

>  disable_irq() and enable_irq() do use the depth field to determine when
>  to actually re-enable the irq.  If enable_irq() is called from within
>  the irq handling path then interrupts for that irq may be enabled even
>  though the irq handling path thinks that it has disabled them.
>
>  I encountered the problem while stress testing an ethernet driver
>  error path.

Good catch, I'll see how this can be fixed generically.

Thanks,
Ben.


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