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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>,
	Bjorn Helgaas <bhelgaas@google.com>,
	"Rafael J. Wysocki" <rjw@sisk.pl>
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-acpi@vger.kernel.org, Yinghai Lu <yinghai@kernel.org>
Subject: [PATCH 03/28] genirq: Do not free unallocated irq descriptors
Date: Sat, 10 Aug 2013 19:45:13 -0700	[thread overview]
Message-ID: <1376189139-31856-4-git-send-email-yinghai@kernel.org> (raw)
In-Reply-To: <1376189139-31856-1-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 1166545..bbf0601 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -165,6 +165,9 @@ 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);
-- 
1.8.1.4


  parent reply	other threads:[~2013-08-11  2:46 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-08-11  2:45 [PATCH 00/28] x86, irq: Support ioapic controller hotplug Yinghai Lu
2013-08-11  2:45 ` [PATCH 01/28] genirq: Split __irq_reserve_irqs from irq_alloc_descs Yinghai Lu
2013-08-11  2:45 ` [PATCH 02/28] genirq: Add irq_alloc_reserved_desc() Yinghai Lu
2013-08-11  2:45 ` Yinghai Lu [this message]
2013-08-11  2:45 ` [PATCH 04/28] x86, irq: Change irq_remap_modify_chip_defaults() to static Yinghai Lu
2013-08-11  2:45 ` [PATCH 04/28] x86, irqi: " Yinghai Lu
2013-08-11  2:45 ` [PATCH 05/28] x86, irq: Modify irq chip once for irq remapping Yinghai Lu
2013-08-11  2:45 ` [PATCH 06/28] x86, irq: Show MSI-X clearly in debug message Yinghai Lu
2013-08-11  2:45 ` [PATCH 07/28] x86, irq: Show MSI-X in /proc/interrupt Yinghai Lu
2013-08-11  2:45 ` [PATCH 08/28] x86, irq: Make dmar_msi/hpet_msi irq_chip name consistent Yinghai Lu
2013-08-11  2:45 ` [PATCH 09/28] ia64, irq: Add dummy create_irq_nr() Yinghai Lu
2013-08-11  2:45 ` [PATCH 10/28] iommu, irq: Allocate irq_desc for dmar_msi with local node Yinghai Lu

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