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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>
This commit is contained in:
Thomas Gleixner 2011-02-07 09:10:39 +01:00
parent b738a50a20
commit fa27271bc8
1 changed files with 20 additions and 32 deletions
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52
kernel/irq/spurious.c
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@ -42,48 +42,36 @@ static int try_one_irq(int irq, struct irq_desc *desc)
raw_spin_unlock(&desc->lock);
return ok;
}
/*
* All handlers must agree on IRQF_SHARED, so we test just the
* first. Check for action->next as well.
*/
action = desc->action;
if (!action || !(action->flags & IRQF_SHARED) || !action->next)
goto out;
/* Honour the normal IRQ locking */
desc->status |= IRQ_INPROGRESS;
action = desc->action;
raw_spin_unlock(&desc->lock);
while (action) {
/* Only shared IRQ handlers are safe to call */
if (action->flags & IRQF_SHARED) {
if (action->handler(irq, action->dev_id) ==
IRQ_HANDLED)
ok = 1;
}
action = action->next;
}
local_irq_disable();
/* Now clean up the flags */
raw_spin_lock(&desc->lock);
action = desc->action;
/*
* While we were looking for a fixup someone queued a real
* IRQ clashing with our walk:
*/
while ((desc->status & IRQ_PENDING) && action) {
/*
* Perform real IRQ processing for the IRQ we deferred
*/
work = 1;
raw_spin_unlock(&desc->lock);
handle_IRQ_event(irq, action);
raw_spin_lock(&desc->lock);
do {
work++;
desc->status &= ~IRQ_PENDING;
}
raw_spin_unlock(&desc->lock);
if (handle_IRQ_event(irq, action) != IRQ_NONE)
ok = 1;
raw_spin_lock(&desc->lock);
action = desc->action;
} while ((desc->status & IRQ_PENDING) && action);
desc->status &= ~IRQ_INPROGRESS;
/*
* If we did actual work for the real IRQ line we must let the
* IRQ controller clean up too
*/
if (work)
if (work > 1)
irq_end(irq, desc);
raw_spin_unlock(&desc->lock);
out:
raw_spin_unlock(&desc->lock);
return ok;
}