linux-kernel - [PATCH 06/13] genirq: bail out early in free

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Date:	Thu, 23 Feb 2012 19:48:52 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 06/13] genirq: bail out early in free_desc()

So we can use irq_free_descs to clear allocated_irqs bits for
preserved irqs.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 kernel/irq/irqdesc.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index b1d6e51..da82457 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -169,6 +169,9 @@ static void free_desc(unsigned int irq)
 {
 	struct irq_desc *desc = irq_to_desc(irq);
 
+	if (!desc)
+		return;
+
 	unregister_irq_proc(irq, desc);
 
 	mutex_lock(&sparse_irq_lock);
-- 
1.7.7

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