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SubjectRe: Using "Asynchronous Notifications" within an interrupt handler
> My question is: is it safe to use the asynchronous notification
> mechanism within an interrupt handler? I see that this call acquires a
> bunch of locks before sending the signal to the process. Would this
> cause any deadlocking situations? Or should I resort to the top and
> bottom half approach for interrupt handling and handle the
> notification in the bottom half?

It may be possible - I have an old driver for custom hardware lying
around here, and it does this in the irq handler:

kill_fasync(&global.fasync_ptr, SIGIO, POLL_IN);

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