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irqdomain: Fix disposal of mappings for interrupt hierarchies

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The function irq_create_of_mapping() is used to create an interrupt
mapping. However, depending on whether the irqdomain, to which the
interrupt belongs, is part of a hierarchy, determines whether the
mapping is created via calling irq_domain_alloc_irqs() or
irq_create_mapping().

To dispose of the interrupt mapping, drivers call irq_dispose_mapping().
However, this function does not check to see if the irqdomain is part
of a hierarchy or not and simply assumes that it was mapped via calling
irq_create_mapping() so calls irq_domain_disassociate() to unmap the
interrupt.

Fix this by checking to see if the irqdomain is part of a hierarchy and
if so call irq_domain_free_irqs() to free/unmap the interrupt.

Signed-off-by: Jon Hunter <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Jiang Liu <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Jon Hunter 2016-06-21 10:23:22 +01:00 • committed by Thomas Gleixner
commit d16dcd3d18
1 changed files with 6 additions and 2 deletions
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8
kernel/irq/irqdomain.c
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@ -680,8 +680,12 @@ void irq_dispose_mapping(unsigned int virq)
if (WARN_ON(domain == NULL))
return;
irq_domain_disassociate(domain, virq);
irq_free_desc(virq);
if (irq_domain_is_hierarchy(domain)) {
irq_domain_free_irqs(virq, 1);
} else {
irq_domain_disassociate(domain, virq);
irq_free_desc(virq);
}
}
EXPORT_SYMBOL_GPL(irq_dispose_mapping);