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genirq/generic_chip: Add irq_unmap callback

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Without this patch irq_domain_disassociate() cannot properly release the
interrupt. In fact, irq_map_generic_chip() checks a bit on 'gc->installed'
but said bit is never cleared, only set.

Commit 088f40b7b0 ("genirq: Generic chip: Add linear irq domain support")
added irq_map_generic_chip() function and also stated "This lacks a removal
function for now".

This commit provides an implementation of an unmap function that can be
called by irq_domain_disassociate().

[ tglx: Made the function static and removed the export as we have neither
  	a prototype nor a modular user. ]

Fixes: 088f40b7b0 ("genirq: Generic chip: Add linear irq domain support")
Signed-off-by: Sebastian Frias <sf84@laposte.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Mason <slash.tmp@free.fr>
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/579F5C5A.2070507@laposte.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Frias 2016-08-01 16:27:38 +02:00 committed by Thomas Gleixner
parent f0c450eaa3
commit ee26c013cd
1 changed files with 21 additions and 0 deletions
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21
kernel/irq/generic-chip.c
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@ -414,8 +414,29 @@ int irq_map_generic_chip(struct irq_domain *d, unsigned int virq,
return 0;
}
static void irq_unmap_generic_chip(struct irq_domain *d, unsigned int virq)
{
struct irq_data *data = irq_domain_get_irq_data(d, virq);
struct irq_domain_chip_generic *dgc = d->gc;
unsigned int hw_irq = data->hwirq;
struct irq_chip_generic *gc;
int irq_idx;
gc = irq_get_domain_generic_chip(d, hw_irq);
if (!gc)
return;
irq_idx = hw_irq % dgc->irqs_per_chip;
clear_bit(irq_idx, &gc->installed);
irq_domain_set_info(d, virq, hw_irq, &no_irq_chip, NULL, NULL, NULL,
NULL);
}
struct irq_domain_ops irq_generic_chip_ops = {
.map = irq_map_generic_chip,
.unmap = irq_unmap_generic_chip,
.xlate = irq_domain_xlate_onetwocell,
};
EXPORT_SYMBOL_GPL(irq_generic_chip_ops);