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SubjectQuestion on irq autoprobe

I see the below comments on probe_irq_off:

* BUGS: When used in a module (which arguably shouldn't happen)
* nothing prevents two IRQ probe callers from overlapping. The
* results of this are non-optimal.

But from the code of probe_irq_on and probe_irq_off, the mutex of
probing_active is held during the whole irq probe procedure, so
I don't understand why the above said that 'nothing prevents two
IRQ probe callers from overlapping", and why isn't the mutex of
probing_active enough to avoid the overlapping?

Ming Lei

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