genirq: threaded irq handlers review fixups
Delta patch to address the review comments. - Implement warning when IRQ_WAKE_THREAD is requested and no thread handler installed - coding style fixes Pointed-out-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -63,10 +63,12 @@
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* Bits used by threaded handlers:
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* IRQTF_RUNTHREAD - signals that the interrupt handler thread should run
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* IRQTF_DIED - handler thread died
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* IRQTF_WARNED - warning "IRQ_WAKE_THREAD w/o thread_fn" has been printed
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*/
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enum {
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IRQTF_RUNTHREAD,
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IRQTF_DIED,
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IRQTF_WARNED,
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};
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typedef irqreturn_t (*irq_handler_t)(int, void *);
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@ -338,6 +338,15 @@ irqreturn_t no_action(int cpl, void *dev_id)
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return IRQ_NONE;
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}
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static void warn_no_thread(unsigned int irq, struct irqaction *action)
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{
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if (test_and_set_bit(IRQTF_WARNED, &action->thread_flags))
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return;
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printk(KERN_WARNING "IRQ %d device %s returned IRQ_WAKE_THREAD "
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"but no thread function available.", irq, action->name);
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}
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/**
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* handle_IRQ_event - irq action chain handler
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* @irq: the interrupt number
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@ -360,6 +369,21 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
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switch (ret) {
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case IRQ_WAKE_THREAD:
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/*
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* Set result to handled so the spurious check
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* does not trigger.
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*/
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ret = IRQ_HANDLED;
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/*
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* Catch drivers which return WAKE_THREAD but
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* did not set up a thread function
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*/
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if (unlikely(!action->thread_fn)) {
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warn_no_thread(irq, action);
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break;
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}
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/*
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* Wake up the handler thread for this
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* action. In case the thread crashed and was
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@ -374,11 +398,6 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
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wake_up_process(action->thread);
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}
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/*
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* Set it to handled so the spurious check
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* does not trigger.
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*/
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ret = IRQ_HANDLED;
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/* Fall through to add to randomness */
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case IRQ_HANDLED:
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status |= action->flags;
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@ -407,20 +407,17 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
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return ret;
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}
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static inline int irq_thread_should_run(struct irqaction *action)
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{
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return test_and_clear_bit(IRQTF_RUNTHREAD, &action->thread_flags);
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}
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static int irq_wait_for_interrupt(struct irqaction *action)
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{
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while (!kthread_should_stop()) {
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set_current_state(TASK_INTERRUPTIBLE);
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if (irq_thread_should_run(action)) {
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if (test_and_clear_bit(IRQTF_RUNTHREAD,
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&action->thread_flags)) {
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__set_current_state(TASK_RUNNING);
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return 0;
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} else
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schedule();
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}
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schedule();
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}
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return -1;
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}
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@ -820,8 +817,8 @@ EXPORT_SYMBOL(free_irq);
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* @irq: Interrupt line to allocate
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* @handler: Function to be called when the IRQ occurs.
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* Primary handler for threaded interrupts
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* @thread_fn: Function called from the irq handler thread
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* If NULL, no irq thread is created
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* @thread_fn: Function called from the irq handler thread
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* If NULL, no irq thread is created
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* @irqflags: Interrupt type flags
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* @devname: An ascii name for the claiming device
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* @dev_id: A cookie passed back to the handler function
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