linux-kernel - [PATCH v8 4/7] irqdomain: Check for NULL function pointer in irq_domain_free_irqs

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Message-Id: <1503017616-3252-5-git-send-email-david.daney@cavium.com>
Date:   Thu, 17 Aug 2017 17:53:33 -0700
From:   David Daney <david.daney@...ium.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-gpio@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, David Daney <david.daney@...ium.com>
Subject: [PATCH v8 4/7] irqdomain: Check for NULL function pointer in irq_domain_free_irqs_hierarchy()

A follow-on patch will call irq_domain_free_irqs_hierarchy() when the
free() function pointer may be NULL.

Add a NULL pointer check to handle this new use case.

Signed-off-by: David Daney <david.daney@...ium.com>
---
 kernel/irq/irqdomain.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 2093b88..24fda75 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -1362,7 +1362,8 @@ static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
 					   unsigned int irq_base,
 					   unsigned int nr_irqs)
 {
-	domain->ops->free(domain, irq_base, nr_irqs);
+	if (domain->ops->free)
+		domain->ops->free(domain, irq_base, nr_irqs);
 }
 
 int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
-- 
1.8.3.1