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authorPaul Mackerras <paulus@samba.org>2005-09-28 20:29:44 +1000
committerPaul Mackerras <paulus@samba.org>2005-09-28 20:29:44 +1000
commitbeeca08738c4c4024c81a591812bfe38f8c436c0 (patch)
tree2d668f8529c54562c13ee06f2777d0f145f92c1e
parent20c8c2106305729e7d5e06f6c3d390e965a3dd34 (diff)
Don't call a NULL ack function in the generic IRQ code.
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>
-rw-r--r--kernel/irq/handle.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 3ff7b925c38..51df337b37d 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -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