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Don't call a NULL ack function in the generic IRQ code.

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Some IRQ controllers don't need an ack function (e.g. OpenPIC on
PPC platforms) and for them we'd rather not have the overhead
of doing an indirect call to a function that does nothing.

Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Paul Mackerras 2005-09-28 20:29:44 +10:00
parent 20c8c21063
commit beeca08738
1 changed files with 4 additions and 2 deletions
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6
kernel/irq/handle.c
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@ -117,14 +117,16 @@ fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs)
/*
* No locking required for CPU-local interrupts:
*/
desc->handler->ack(irq);
if (desc->handler->ack)
desc->handler->ack(irq);
action_ret = handle_IRQ_event(irq, regs, desc->action);
desc->handler->end(irq);
return 1;
}
spin_lock(&desc->lock);
desc->handler->ack(irq);
if (desc->handler->ack)
desc->handler->ack(irq);
/*
* REPLAY is when Linux resends an IRQ that was dropped earlier
* WAITING is used by probe to mark irqs that are being tested