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Subject[patch 1/2] genirq: allow usage of no_irq_chip

Some dumb interrupt hardware has no way to ack/mask.... Instead of creating a
seperate chip structure we allow to reuse the already existing no_irq_chip

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

kernel/irq/handle.c | 8 ++++++--
kernel/irq/manage.c | 2 +-
kernel/irq/proc.c | 5 ++---
3 files changed, 9 insertions(+), 6 deletions(-)

Index: linux-2.6.17-rc6-mm/kernel/irq/handle.c
===================================================================
--- linux-2.6.17-rc6-mm.orig/kernel/irq/handle.c 2006-06-10 10:32:51.000000000 +0200
+++ linux-2.6.17-rc6-mm/kernel/irq/handle.c 2006-06-10 10:42:22.000000000 +0200
@@ -63,8 +63,12 @@
*/
static void ack_bad(unsigned int irq)
{
- print_irq_desc(irq, irq_desc + irq);
- ack_bad_irq(irq);
+ struct irq_desc *desc = irq_desc + irq;
+
+ if (desc->handle_irq == handle_bad_irq) {
+ print_irq_desc(irq, desc);
+ ack_bad_irq(irq);
+ }
}

/*
@@ -89,6 +93,7 @@
.enable = noop,
.disable = noop,
.ack = ack_bad,
+ .unmask = noop,
.end = noop,
};

Index: linux-2.6.17-rc6-mm/kernel/irq/manage.c
===================================================================
--- linux-2.6.17-rc6-mm.orig/kernel/irq/manage.c 2006-06-10 10:32:53.000000000 +0200
+++ linux-2.6.17-rc6-mm/kernel/irq/manage.c 2006-06-10 10:42:22.000000000 +0200
@@ -199,7 +199,7 @@
if (irq >= NR_IRQS)
return -EINVAL;

- if (desc->chip == &no_irq_chip)
+ if (desc->handle_irq == &handle_bad_irq)
return -ENOSYS;
/*
* Some drivers like serial.c use request_irq() heavily,
Index: linux-2.6.17-rc6-mm/kernel/irq/proc.c
===================================================================
--- linux-2.6.17-rc6-mm.orig/kernel/irq/proc.c 2006-06-10 10:32:49.000000000 +0200
+++ linux-2.6.17-rc6-mm/kernel/irq/proc.c 2006-06-10 10:42:22.000000000 +0200
@@ -116,9 +116,8 @@
{
char name [MAX_NAMELEN];

- if (!root_irq_dir ||
- (irq_desc[irq].chip == &no_irq_chip) ||
- irq_desc[irq].dir)
+ if (!root_irq_dir || (irq_desc[irq].handle_irq == &handle_bad_irq) ||
+ irq_desc[irq].dir)
return;

memset(name, 0, MAX_NAMELEN);
--

-
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