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 <ying...@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
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