wake_up does not return

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Dear List,

I have an interesting problem on 3.0.35 with the rt56 patch on ARM.

I have some external events that drive my ISR, which I have set it up
as non_threaded one.
When the interrupt rate is low, 1.8msec things are going fine, but
when the rate is higher, the wake_up call from the isr does not
return. The system is frozen. No Magic SysRq. Nothing.

All will work fine once I change my ISR to be a threaded one.

Any ideas where to search?

Kind regards,
Andy
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