diff options
Diffstat (limited to 'kernel/irq/manage.c')
| -rw-r--r-- | kernel/irq/manage.c | 31 |
1 files changed, 27 insertions, 4 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 3ed7aee848651c..627d401c2979bb 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -225,8 +225,14 @@ int setup_irq(unsigned int irq, struct irqaction *new) p = &desc->action; old = *p; if (old) { - /* Can't share interrupts unless both agree to */ - if (!(old->flags & new->flags & SA_SHIRQ)) + /* + * Can't share interrupts unless both agree to and are + * the same type (level, edge, polarity). So both flag + * fields must have SA_SHIRQ set and the bits which + * set the trigger type must match. + */ + if (!((old->flags & new->flags) & SA_SHIRQ) || + ((old->flags ^ new->flags) & SA_TRIGGER_MASK)) goto mismatch; #if defined(CONFIG_IRQ_PER_CPU) && defined(SA_PERCPU_IRQ) @@ -250,7 +256,22 @@ int setup_irq(unsigned int irq, struct irqaction *new) #endif if (!shared) { irq_chip_set_defaults(desc->chip); - compat_irq_chip_set_default_handler(desc); + + /* Setup the type (level, edge polarity) if configured: */ + if (new->flags & SA_TRIGGER_MASK) { + if (desc->chip && desc->chip->set_type) + desc->chip->set_type(irq, + new->flags & SA_TRIGGER_MASK); + else + /* + * SA_TRIGGER_* but the PIC does not support + * multiple flow-types? + */ + printk(KERN_WARNING "setup_irq(%d) SA_TRIGGER" + "set. No set_type function available\n", + irq); + } else + compat_irq_chip_set_default_handler(desc); desc->status &= ~(IRQ_AUTODETECT | IRQ_WAITING | IRQ_INPROGRESS); @@ -262,7 +283,9 @@ int setup_irq(unsigned int irq, struct irqaction *new) desc->chip->startup(irq); else desc->chip->enable(irq); - } + } else + /* Undo nested disables: */ + desc->depth = 1; } spin_unlock_irqrestore(&desc->lock, flags); |