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Date: Sun, 3 Jul 2016 03:24:08 +0300 From: Alexander Popov <alex.popov@...ux.com> To: Jiang Liu <jiang.liu@...ux.intel.com>, Marc Zyngier <marc.zyngier@....com>, Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org, Alexander Popov <alex.popov@...ux.com> Subject: [PATCH 1/1] irqdomain: Fix irq_domain_alloc_irqs_recursive() error handling If an irq_domain is auto-recursive and irq_domain_alloc_irqs_recursive() for its parent has returned an error, then do return and avoid calling irq_domain_free_irqs_recursive() uselessly, because: - if domain->ops->alloc() had failed for an auto-recursive irq_domain, then irq_domain_free_irqs_recursive() had already been called; - if domain->ops->alloc() had failed for a not auto-recursive irq_domain, then there is nothing to free at all. Signed-off-by: Alexander Popov <alex.popov@...ux.com> --- kernel/irq/irqdomain.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 8798b6c..6458e34 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -1144,8 +1144,10 @@ int irq_domain_alloc_irqs_recursive(struct irq_domain *domain, if (recursive) ret = irq_domain_alloc_irqs_recursive(parent, irq_base, nr_irqs, arg); - if (ret >= 0) - ret = domain->ops->alloc(domain, irq_base, nr_irqs, arg); + if (ret < 0) + return ret; + + ret = domain->ops->alloc(domain, irq_base, nr_irqs, arg); if (ret < 0 && recursive) irq_domain_free_irqs_recursive(parent, irq_base, nr_irqs); -- 1.9.1
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