Patchwork [v4,03/28] genirq: Do not free unallocated irq descriptors

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Submitter Yinghai Lu
Date Aug. 11, 2013, 2:47 a.m.
Message ID <1376189294-32022-4-git-send-email-yinghai@kernel.org>
Download mbox | patch
Permalink /patch/266282/
State Not Applicable
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Comments

Yinghai Lu - Aug. 11, 2013, 2:47 a.m.
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(+)

Patch

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);