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 8/8] irq: Do not free unallocated irq descriptors
Date: Thu, 1 May 2014 16:18:22 -0700 [thread overview]
Message-ID: <1398986302-30455-9-git-send-email-yinghai@kernel.org> (raw)
In-Reply-To: <1398986302-30455-1-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 1a7e663..c3e1f7b 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -166,6 +166,9 @@ 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
prev parent reply other threads:[~2014-05-01 23:21 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-01 23:18 [PATCH 0/8] irq: core changes for x86 ioapic hotplug Yinghai Lu
2014-05-01 23:18 ` [PATCH 1/8] x86, irq: Remove not needed irq_reserve_irqs calling Yinghai Lu
2014-05-01 23:18 ` [PATCH 2/8] sh, irq: Remove irq_reserve_irq calling Yinghai Lu
2014-05-02 2:38 ` Simon Horman
2014-05-02 15:19 ` Sergei Shtylyov
2014-05-01 23:18 ` [PATCH 3/8] irq: Use irq_alloc_desc_at instead of irq_reserve_irq Yinghai Lu
2014-05-01 23:18 ` [PATCH 4/8] s390: Mark bits in allocated_irqs in general code Yinghai Lu
2014-05-01 23:18 ` [PATCH 5/8] irq: Kill irq_reserve_irq/irq_reserve_irqs Yinghai Lu
2014-05-01 23:18 ` [PATCH 6/8] irq: Add new reserved_irqs clear/mark functions Yinghai Lu
2014-05-02 10:50 ` Thomas Gleixner
2014-05-01 23:18 ` [PATCH 7/8] irq: Add irq_alloc_reserved_desc() Yinghai Lu
2014-05-01 23:18 ` Yinghai Lu [this message]
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