From: Johan Hovold <johan+linaro@xxxxxxxxxx>
commit e3b7ab025e931accdc2c12acf9b75c6197f1c062 upstream.
In case a newly allocated IRQ ever ends up not having any associated
struct irq_data it would not even be possible to dispose the mapping.
Replace the bogus disposal with a WARN_ON().
This will also be used to fix a shared-interrupt mapping race, hence the
CC-stable tag.
Fixes: 1e2a7d78499e ("irqdomain: Don't set type when mapping an IRQ")
Cc: stable@xxxxxxxxxxxxxxx # 4.8
Tested-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
Tested-by: Mark-PK Tsai <mark-pk.tsai@xxxxxxxxxxxx>
Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230213104302.17307-4-johan+linaro@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/irq/irqdomain.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -837,13 +837,8 @@ unsigned int irq_create_fwspec_mapping(s
}
irq_data = irq_get_irq_data(virq);
- if (!irq_data) {
- if (irq_domain_is_hierarchy(domain))
- irq_domain_free_irqs(virq, 1);
- else
- irq_dispose_mapping(virq);
+ if (WARN_ON(!irq_data))
return 0;
- }
/* Store trigger type */
irqd_set_trigger_type(irq_data, type);
