query about IRQF_SHARED and interrupt handler latency

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hi all

I was going through the ieee subsystem code in ohci1394.c in kernel v 2.6.19.
I have some queries.

1. ohci1394.c is the core of the firewire subsystem in the Linux kernel right?
2. then what is ieee1394_core.c?
3. Also i changed the irq handler for the ohci irq handler by changing
the IRQF_SHARED with IRQF_DISABLED so that i can run my firewire core
handler without any interference. Am i doing it right?

4. Why did kernel developers change the SA_SHIRQ and family to
IRQF_SHARED et all ?

Thanks in advance

Regards
pradeep


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