On Wednesday 12 June 2013 10:35:44 Alan Stern wrote:
> On Wed, 12 Jun 2013, Ming Lei wrote:
>
> > If not, I am wondering why one USB driver need register another hard
> > interrupt handler? Could you share such examples? I understand the
> > case only exists with timer handler as discussed with Oliver, don't I?
>
> Here's another possibility. A USB driver has a private lock, and it
> acquires this lock in its completion handler. But it also acquires
> this lock in other routines, and those other routines may be called by
> other drivers or subsystems in interrupt context.
That is fatal. But again mechanically using _irqsave in complete()
does the job. No other place can be affected.
Regards
Oliver
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