diff options
Diffstat (limited to 'kernel/irq/manage.c')
| -rw-r--r-- | kernel/irq/manage.c | 46 |
1 files changed, 31 insertions, 15 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 89a3ea82569b..585f6381f8e4 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -565,8 +565,8 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq, * IRQF_TRIGGER_* but the PIC does not support multiple * flow-types? */ - pr_debug("No set_type function for IRQ %d (%s)\n", irq, - chip ? (chip->name ? : "unknown") : "unknown"); + pr_debug("genirq: No set_type function for IRQ %d (%s)\n", irq, + chip ? (chip->name ? : "unknown") : "unknown"); return 0; } @@ -600,7 +600,7 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq, ret = 0; break; default: - pr_err("setting trigger mode %lu for irq %u failed (%pF)\n", + pr_err("genirq: Setting trigger mode %lu for irq %u failed (%pF)\n", flags, irq, chip->irq_set_type); } if (unmask) @@ -837,8 +837,7 @@ void exit_irq_thread(void) action = kthread_data(tsk); - printk(KERN_ERR - "exiting task \"%s\" (%d) is an active IRQ thread (irq %d)\n", + pr_err("genirq: exiting task \"%s\" (%d) is an active IRQ thread (irq %d)\n", tsk->comm ? tsk->comm : "", tsk->pid, action->irq); desc = irq_to_desc(action->irq); @@ -878,7 +877,6 @@ static int __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) { struct irqaction *old, **old_ptr; - const char *old_name = NULL; unsigned long flags, thread_mask = 0; int ret, nested, shared = 0; cpumask_var_t mask; @@ -972,10 +970,8 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) */ if (!((old->flags & new->flags) & IRQF_SHARED) || ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK) || - ((old->flags ^ new->flags) & IRQF_ONESHOT)) { - old_name = old->name; + ((old->flags ^ new->flags) & IRQF_ONESHOT)) goto mismatch; - } /* All handlers must agree on per-cpuness */ if ((old->flags & IRQF_PERCPU) != @@ -1031,6 +1027,27 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) * all existing action->thread_mask bits. */ new->thread_mask = 1 << ffz(thread_mask); + + } else if (new->handler == irq_default_primary_handler) { + /* + * The interrupt was requested with handler = NULL, so + * we use the default primary handler for it. But it + * does not have the oneshot flag set. In combination + * with level interrupts this is deadly, because the + * default primary handler just wakes the thread, then + * the irq lines is reenabled, but the device still + * has the level irq asserted. Rinse and repeat.... + * + * While this works for edge type interrupts, we play + * it safe and reject unconditionally because we can't + * say for sure which type this interrupt really + * has. The type flags are unreliable as the + * underlying chip implementation can override them. + */ + pr_err("genirq: Threaded irq requested with handler=NULL and !ONESHOT for irq %d\n", + irq); + ret = -EINVAL; + goto out_mask; } if (!shared) { @@ -1078,7 +1095,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) if (nmsk != omsk) /* hope the handler works with current trigger mode */ - pr_warning("IRQ %d uses trigger mode %u; requested %u\n", + pr_warning("genirq: irq %d uses trigger mode %u; requested %u\n", irq, nmsk, omsk); } @@ -1115,14 +1132,13 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) return 0; mismatch: -#ifdef CONFIG_DEBUG_SHIRQ if (!(new->flags & IRQF_PROBE_SHARED)) { - printk(KERN_ERR "IRQ handler type mismatch for IRQ %d\n", irq); - if (old_name) - printk(KERN_ERR "current handler: %s\n", old_name); + pr_err("genirq: Flags mismatch irq %d. %08x (%s) vs. %08x (%s)\n", + irq, new->flags, new->name, old->flags, old->name); +#ifdef CONFIG_DEBUG_SHIRQ dump_stack(); - } #endif + } ret = -EBUSY; out_mask: |