[PATCH 3/3 v2] powerpc/mpic: FSL MPIC error interrupt support.
Scott Wood
scottwood at freescale.com
Tue Jul 10 06:22:32 EST 2012
On 07/09/2012 02:03 PM, Kumar Gala wrote:
>
> On Jul 9, 2012, at 3:47 AM, Varun Sethi wrote:
>
>> +int mpic_err_int_init(struct mpic *mpic, irq_hw_number_t irqnum)
>> +{
>
> Why can't we do this during mpic_init() time?
Are you willing to hardcode that IRQ 16 is the error interrupt, without
waiting to see an intspec?
>> + ret = request_irq(virq, fsl_error_int_handler, IRQF_NO_THREAD,
>> + "mpic-error-int", mpic);
>
> Hmm, should we be using irq_set_chained_handler() instead of request_irq
As I said last time, "that's how Varun initially did it and I asked him
to change it, because it gets a lot trickier to get things right, and I
didn't see what it was buying us." That original patch had locking
problems as a result.
Using the chained handler mechanism puts the responsibility on us to do
a lot of the generic stuff that's already perfectly well implemented in
generic code. We're implementing a cascade, not a new flow.
-Scott
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