On Wed, 2010-05-19 at 23:08 +0200, Thomas Gleixner wrote:

On Wed, 19 May 2010, Thomas Gleixner wrote:

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I'm still not clear on why the ultimate solution wasn't to have XICS report
edge triggered as edge triggered. Probably some complexity of the entire power
stack that I am ignorant of.

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Apart from the issue of loosing interrupts there is also the fact that
masking on the XICS requires an RTAS call which takes a global lock.

Right, I'd love to avoid that but with real level interrupts we'd run
into an interrupt storm. Though another solution would be to issue the
EOI after the threaded handler finished, that'd work as well, but
needs testing.

Thought more about that. The case at hand (ehea) is nasty:

The driver does _NOT_ disable the rx interrupt in the card in the rx
interrupt handler - for whatever reason.

Yeah I saw that, but I don't know why it's written that way. Perhaps
Jan-Bernd or Doug will chime in and enlighten us? :)

cheers