linux-kernel - [PATCH] genirq: fix error path in __setup

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Date:   Sun, 11 Jun 2017 00:38:36 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] genirq: fix error path in __setup_irq

If __irq_set_trigger() fails irq_request_resources() was successfully
called before. Therefore we should release all potentially claimed
resources in the error path.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 kernel/irq/manage.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 49c37f1e..4c34696c 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1318,8 +1318,10 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
 			ret = __irq_set_trigger(desc,
 						new->flags & IRQF_TRIGGER_MASK);
 
-			if (ret)
+			if (ret) {
+				irq_release_resources(desc);
 				goto out_mask;
+			}
 		}
 
 		desc->istate &= ~(IRQS_AUTODETECT | IRQS_SPURIOUS_DISABLED | \
-- 
2.13.1