linux-kernel - [PATCH 2/2] KVM: lib: use jump label to handle resource release in irq_bypass_register

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Message-ID: <1575600833-12839-3-git-send-email-linmiaohe@huawei.com>
Date:   Fri, 6 Dec 2019 10:53:53 +0800
From:   linmiaohe <linmiaohe@...wei.com>
To:     <pbonzini@...hat.com>, <alex.williamson@...hat.com>
CC:     <linmiaohe@...wei.com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2] KVM: lib: use jump label to handle resource release in irq_bypass_register_producer()

From: Miaohe Lin <linmiaohe@...wei.com>

Use out_err jump label to handle resource release. It's a
good practice to release resource in one place and help
eliminate some duplicated code.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 virt/lib/irqbypass.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/virt/lib/irqbypass.c b/virt/lib/irqbypass.c
index cb0c801b3bc2..28fda42e471b 100644
--- a/virt/lib/irqbypass.c
+++ b/virt/lib/irqbypass.c
@@ -85,6 +85,7 @@ int irq_bypass_register_producer(struct irq_bypass_producer *producer)
 {
 	struct irq_bypass_producer *tmp;
 	struct irq_bypass_consumer *consumer;
+	int ret;
 
 	if (!producer->token)
 		return -EINVAL;
@@ -98,20 +99,16 @@ int irq_bypass_register_producer(struct irq_bypass_producer *producer)
 
 	list_for_each_entry(tmp, &producers, node) {
 		if (tmp->token == producer->token) {
-			mutex_unlock(&lock);
-			module_put(THIS_MODULE);
-			return -EBUSY;
+			ret = -EBUSY;
+			goto out_err;
 		}
 	}
 
 	list_for_each_entry(consumer, &consumers, node) {
 		if (consumer->token == producer->token) {
-			int ret = __connect(producer, consumer);
-			if (ret) {
-				mutex_unlock(&lock);
-				module_put(THIS_MODULE);
-				return ret;
-			}
+			ret = __connect(producer, consumer);
+			if (ret)
+				goto out_err;
 			break;
 		}
 	}
@@ -121,6 +118,10 @@ int irq_bypass_register_producer(struct irq_bypass_producer *producer)
 	mutex_unlock(&lock);
 
 	return 0;
+out_err:
+	mutex_unlock(&lock);
+	module_put(THIS_MODULE);
+	return ret;
 }
 EXPORT_SYMBOL_GPL(irq_bypass_register_producer);
 
-- 
2.19.1