From: Marc Zyngier maz@kernel.org
[ Upstream commit 3841245e8498a789c65dedd7ffa8fb2fee2c0684 ]
The alpine-msi driver has an interesting allocation error handling, where it frees the same interrupts repeatedly. Hilarity follows.
This code is probably never executed, but let's fix it nonetheless.
Fixes: e6b78f2c3e14 ("irqchip: Add the Alpine MSIX interrupt controller") Signed-off-by: Marc Zyngier maz@kernel.org Reviewed-by: Antoine Tenart atenart@kernel.org Cc: Tsahee Zidenberg tsahee@annapurnalabs.com Cc: Antoine Tenart atenart@kernel.org Link: https://lore.kernel.org/r/20201129135525.396671-1-maz@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/irqchip/irq-alpine-msi.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/irqchip/irq-alpine-msi.c b/drivers/irqchip/irq-alpine-msi.c index 63d980995d17d..ac431697ebe1c 100644 --- a/drivers/irqchip/irq-alpine-msi.c +++ b/drivers/irqchip/irq-alpine-msi.c @@ -165,8 +165,7 @@ static int alpine_msix_middle_domain_alloc(struct irq_domain *domain, return 0;
err_sgi: - while (--i >= 0) - irq_domain_free_irqs_parent(domain, virq, i); + irq_domain_free_irqs_parent(domain, virq, i - 1); alpine_msix_free_sgi(priv, sgi, nr_irqs); return err; }