Re: Question on irq autoprobe

[Ming Lei]

On Fri, Sep 14, 2012 at 10:02 AM, Ming Lei <tom.leiming@xxxxxxxxx> wrote:
> Hi,
>
> 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?

Thomas, I really appreciate that if you may clarify the question, :-)


Thank,
-- 
Ming Lei
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