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genirq: Provide irq_request/release_resources chip callbacks

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For certain irq types, e.g. gpios, it's necessary to request resources
before starting up the irq.

This might fail so we cannot use the irq_startup() callback because we
might call the irq_set_type() callback before that which does not make
sense when the resource is not available. Calling irq_startup() before
irq_set_type() can lead to spurious interrupts which is not desired
either.

Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Jean-Jacques Hiblot <[email protected]>
Cc: Grant Likely <[email protected]>
Cc: [email protected] 
Reviewed-by: Linus Walleij <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Thomas Gleixner 2014-03-08 08:59:58 +01:00
commit c1bacbae81
2 changed files with 33 additions and 1 deletions
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28
kernel/irq/manage.c
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@ -896,6 +896,23 @@ static void irq_setup_forced_threading(struct irqaction *new)
}
}
static int irq_request_resources(struct irq_desc *desc)
{
struct irq_data *d = &desc->irq_data;
struct irq_chip *c = d->chip;
return c->irq_request_resources ? c->irq_request_resources(d) : 0;
}
static void irq_release_resources(struct irq_desc *desc)
{
struct irq_data *d = &desc->irq_data;
struct irq_chip *c = d->chip;
if (c->irq_release_resources)
c->irq_release_resources(d);
}
/*
* Internal function to register an irqaction - typically used to
* allocate special interrupts that are part of the architecture.
@ -1091,6 +1108,13 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
}
if (!shared) {
ret = irq_request_resources(desc);
if (ret) {
pr_err("Failed to request resources for %s (irq %d) on irqchip %s\n",
new->name, irq, desc->irq_data.chip->name);
goto out_mask;
}
init_waitqueue_head(&desc->wait_for_threads);
/* Setup the type (level, edge polarity) if configured: */
@ -1261,8 +1285,10 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
*action_ptr = action->next;
/* If this was the last handler, shut down the IRQ line: */
if (!desc->action)
if (!desc->action) {
irq_shutdown(desc);
irq_release_resources(desc);
}
#ifdef CONFIG_SMP
/* make sure affinity_hint is cleaned up */