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From: Yinghai Lu <yinghai@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
	"H. Peter Anvin" <hpa@zytor.com>, Tony Luck <tony.luck@intel.com>
Cc: linux-kernel@vger.kernel.org, Yinghai Lu <yinghai@kernel.org>
Subject: [PATCH v3 8/8] irq: Do not free unallocated irq descriptors
Date: Mon,  5 May 2014 18:33:26 -0700	[thread overview]
Message-ID: <1399340006-31550-9-git-send-email-yinghai@kernel.org> (raw)
In-Reply-To: <1399340006-31550-1-git-send-email-yinghai@kernel.org>

Hot-added interrupt controllers can reserve a range of interrupt
numbers, but only allocate some of them. To simplify the release on
hot-remove allow them to iterate over the reserved range, let the
free_desc() code return early when the descriptor does not exist

-v2: changelog from tglx

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

diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 7b2b83a..b46ab9e 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -167,6 +167,9 @@ 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);
-- 
1.8.4.5


  parent reply	other threads:[~2014-05-06  1:35 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-06  1:33 [PATCH v3 0/8] irq: core changes for x86 ioapic hotplug Yinghai Lu
2014-05-06  1:33 ` [PATCH v3 1/8] x86, irq: Remove not needed irq_reserve_irqs calling Yinghai Lu
2014-05-06  1:33 ` [PATCH v3 2/8] sh, irq: Remove irq_reserve_irq calling Yinghai Lu
2014-05-06  1:33 ` [PATCH v3 3/8] irq: Use irq_alloc_desc_at instead of irq_reserve_irq Yinghai Lu
2014-05-06  1:33 ` [PATCH v3 4/8] s390: Mark bits in allocated_irqs in general code Yinghai Lu
2014-05-06  1:33 ` [PATCH v3 5/8] irq: Kill irq_reserve_irq/irq_reserve_irqs Yinghai Lu
2014-05-06  1:33 ` [PATCH v3 6/8] irq: Add new reserved_irqs clear/mark functions Yinghai Lu
2014-05-06  1:33 ` [PATCH v3 7/8] irq: Add irq_alloc_reserved_desc() Yinghai Lu
2014-05-06  1:33 ` Yinghai Lu [this message]
2014-05-07  9:46 ` [PATCH v3 0/8] irq: core changes for x86 ioapic hotplug Ingo Molnar

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