[PATCH] genirq: core

Core genirq support: add the irq-chip and irq-flow abstractions.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

6 files changed, 41 insertions, 3 deletions

diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c
index ed98c7d46cf2..cfdb63eb5c94 100644
--- a/kernel/irq/autoprobe.c
+++ b/kernel/irq/autoprobe.c
@@ -40,8 +40,15 @@ unsigned long probe_irq_on(void)
                 desc = irq_desc + i;
 
                 spin_lock_irq(&desc->lock);
-                if (!desc->action && !(desc->status & IRQ_NOPROBE))
+                if (!desc->action && !(desc->status & IRQ_NOPROBE)) {
+                        /*
+                         * Some chips need to know about probing in
+                         * progress:
+                         */
+                        if (desc->chip->set_type)
+                                desc->chip->set_type(i, IRQ_TYPE_PROBE);
                         desc->chip->startup(i);
+                }
                 spin_unlock_irq(&desc->lock);
         }
 
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index bddcb8f5fea4..a04b516afa59 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -18,6 +18,16 @@
 
 #include "internals.h"
 
+/**
+ * handle_bad_irq - handle spurious and unhandled irqs
+ */
+void fastcall
+handle_bad_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs)
+{
+        kstat_this_cpu.irqs[irq]++;
+        ack_bad_irq(irq);
+}
+
 /*
  * Linux has a controller-independent interrupt architecture.
  * Every controller has a 'controller-template', that is used
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 46feba630266..2ba8ae3c8e96 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -4,6 +4,12 @@
 
 extern int noirqdebug;
 
+/* Set default functions for irq_chip structures: */
+extern void irq_chip_set_defaults(struct irq_chip *chip);
+
+/* Set default handler: */
+extern void compat_irq_chip_set_default_handler(struct irq_desc *desc);
+
 #ifdef CONFIG_PROC_FS
 extern void register_irq_proc(unsigned int irq);
 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 1a2e7663096a..b61784ee78b2 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -153,6 +153,17 @@ int can_request_irq(unsigned int irq, unsigned long irqflags)
         return !action;
 }
 
+void compat_irq_chip_set_default_handler(struct irq_desc *desc)
+{
+        /*
+         * If the architecture still has not overriden
+         * the flow handler then zap the default. This
+         * should catch incorrect flow-type setting.
+         */
+        if (desc->handle_irq == &handle_bad_irq)
+                desc->handle_irq = NULL;
+}
+
 /*
  * Internal function to register an irqaction - typically used to
  * allocate special interrupts that are part of the architecture.
@@ -217,6 +228,9 @@ int setup_irq(unsigned int irq, struct irqaction *new)
                 desc->status |= IRQ_PER_CPU;
 #endif
         if (!shared) {
+                irq_chip_set_defaults(desc->chip);
+                compat_irq_chip_set_default_handler(desc);
+
                 desc->status &= ~(IRQ_AUTODETECT | IRQ_WAITING |
                                   IRQ_INPROGRESS);
 
diff --git a/kernel/irq/resend.c b/kernel/irq/resend.c
index 096b102fb392..872f91ba2ce8 100644
--- a/kernel/irq/resend.c
+++ b/kernel/irq/resend.c
@@ -37,9 +37,9 @@ static void resend_irqs(unsigned long arg)
                 irq = find_first_bit(irqs_resend, NR_IRQS);
                 clear_bit(irq, irqs_resend);
                 desc = irq_desc + irq;
-                spin_lock_irqsave(&desc->lock, flags);
+                local_irq_disable();
                 desc->handle_irq(irq, desc, NULL);
-                spin_unlock_irqrestore(&desc->lock, flags);
+                local_irq_enable();
         }
 }
 
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index 3a0a62123301..ca187b83f897 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -168,6 +168,7 @@ void note_interrupt(unsigned int irq, struct irq_desc *desc,
                  */
                 printk(KERN_EMERG "Disabling IRQ #%d\n", irq);
                 desc->status |= IRQ_DISABLED;
+                desc->depth = 1;
                 desc->chip->disable(irq);
         }
         desc->irqs_unhandled = 0;