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genirq: Fixup poll handling
try_one_irq() contains redundant code and lots of useless checks for shared interrupts. Check for shared before setting IRQ_INPROGRESS and then call handle_IRQ_event() while pending. Shorter version with the same functionality. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -42,48 +42,36 @@ static int try_one_irq(int irq, struct irq_desc *desc)
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raw_spin_unlock(&desc->lock);
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return ok;
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}
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/*
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* All handlers must agree on IRQF_SHARED, so we test just the
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* first. Check for action->next as well.
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*/
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action = desc->action;
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if (!action || !(action->flags & IRQF_SHARED) || !action->next)
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goto out;
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/* Honour the normal IRQ locking */
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desc->status |= IRQ_INPROGRESS;
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action = desc->action;
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raw_spin_unlock(&desc->lock);
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while (action) {
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/* Only shared IRQ handlers are safe to call */
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if (action->flags & IRQF_SHARED) {
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if (action->handler(irq, action->dev_id) ==
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IRQ_HANDLED)
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ok = 1;
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}
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action = action->next;
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}
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local_irq_disable();
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/* Now clean up the flags */
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raw_spin_lock(&desc->lock);
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action = desc->action;
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/*
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* While we were looking for a fixup someone queued a real
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* IRQ clashing with our walk:
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*/
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while ((desc->status & IRQ_PENDING) && action) {
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/*
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* Perform real IRQ processing for the IRQ we deferred
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*/
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work = 1;
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raw_spin_unlock(&desc->lock);
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handle_IRQ_event(irq, action);
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raw_spin_lock(&desc->lock);
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do {
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work++;
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desc->status &= ~IRQ_PENDING;
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}
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raw_spin_unlock(&desc->lock);
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if (handle_IRQ_event(irq, action) != IRQ_NONE)
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ok = 1;
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raw_spin_lock(&desc->lock);
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action = desc->action;
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} while ((desc->status & IRQ_PENDING) && action);
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desc->status &= ~IRQ_INPROGRESS;
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/*
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* If we did actual work for the real IRQ line we must let the
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* IRQ controller clean up too
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*/
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if (work)
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if (work > 1)
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irq_end(irq, desc);
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raw_spin_unlock(&desc->lock);
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out:
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raw_spin_unlock(&desc->lock);
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return ok;
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}
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