do_IRQ query

["Ranjan Parthasarathy" <ranjanp@efi.com>]

Is it safe to call do_IRQ directly inside interrupt handlers without doing a 
irq_enter. I have seen ksoftirqd_CPUX crashes when I call the do_IRQ routines 
directly instead of the following sequence.

irq_enter()
do_IRQ
irq_exit()

Some code use it while some do not. The timer code in arch/mips/kernel/time.c 
uses it in ll_timer_interrupt. Some ports call this function directly in their 
interrupt handlers.

Any information would be greatly appreciated.

Thank you

Ranjan