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[ARM] 3690/1: genirq: Introduce and make use of dummy irq chip

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Patch from Thomas Gleixner

From: Thomas Gleixner <tglx@linutronix.de>

ARM has a couple of really dumb interrupt controllers.
Implement a generic one and fixup the ARM migration. ARM reused
the no_irq_chip for this purpose, but this does not work out
for platforms which are not converted to the new interrupt
type handling model.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Thomas Gleixner
2006-07-01 22:30:08 +01:00
committed by Russell King
parent a2166abd06
commit f8b5473fcb
3 changed files with 30 additions and 4 deletions
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15
kernel/irq/chip.c
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@ -462,9 +462,18 @@ __set_irq_handler(unsigned int irq,
if (!handle)
handle = handle_bad_irq;
if (is_chained && desc->chip == &no_irq_chip)
printk(KERN_WARNING "Trying to install "
"chained interrupt type for IRQ%d\n", irq);
if (desc->chip == &no_irq_chip) {
printk(KERN_WARNING "Trying to install %sinterrupt handler "
"for IRQ%d\n", is_chained ? "chained " : " ", irq);
/*
* Some ARM implementations install a handler for really dumb
* interrupt hardware without setting an irq_chip. This worked
* with the ARM no_irq_chip but the check in setup_irq would
* prevent us to setup the interrupt at all. Switch it to
* dummy_irq_chip for easy transition.
*/
desc->chip = &dummy_irq_chip;
}
spin_lock_irqsave(&desc->lock, flags);