linux-kernel - Question on irq autoprobe

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Date:	Fri, 14 Sep 2012 10:02:16 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>
Subject: Question on irq autoprobe

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?

Thanks,
-- 
Ming Lei
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