Re: de2104x: interrupts before interrupt handler is registered

[linux-os (Dick Johnson)]

On Wed, 8 Mar 2006, Robert Hancock wrote:

> linux-os (Dick Johnson) wrote:
>> You don't bother to read. The reported interrupt is WRONG, INVALID,
>> INCORRECT, BROKEN, until __after__ the device is enabled. That means
>> that one CANNOT put an interrupt handler in place before the
>> device is enabled.
>
> And my point is, even if you COULD put an interrupt handler into place
> before enabling the device, if the device can be in an unstable state
> such that the interrupt can't be acknowledged reliably, how can you
> handle it without causing an interrupt storm?
>

Easy. Mask off the interrupts in the device. Software should
certainly "know" if the device has been initialized to a stable
state. Until it has been initialized, the ISR will simply
clear and mask the device.

> --
> Robert Hancock      Saskatoon, SK, Canada
> To email, remove "nospam" from hancockr@xxxxxxxxxxxxx
>

Cheers,
Dick Johnson
Penguin : Linux version 2.6.15.4 on an i686 machine (5589.50 BogoMips).
Warning : 98.36% of all statistics are fiction, book release in April.
_


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