From: Sebastian Frias <sf84@xxxxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit ee26c013cdee0b947e29d6cadfb9ff3341c69ff9 upstream.
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 088f40b7b027 ("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. ]
[js] use irq_get_irq_data, irq_set_chip_and_handler, and
irq_set_chip_data in 3.12
Fixes: 088f40b7b027 ("genirq: Generic chip: Add linear irq domain support")
Signed-off-by: Sebastian Frias <sf84@xxxxxxxxxxx>
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: Mason <slash.tmp@xxxxxxx>
Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/579F5C5A.2070507@xxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
kernel/irq/generic-chip.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c
index 452d6f2ba21d..6733fbf14dbe 100644
--- a/kernel/irq/generic-chip.c
+++ b/kernel/irq/generic-chip.c
@@ -395,8 +395,28 @@ static 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_get_irq_data(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_set_chip_and_handler(virq, &no_irq_chip, NULL);
+ irq_set_chip_data(virq, 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);
--
2.10.2
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