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

Message ID 1376189294-32022-4-git-send-email-yinghai@kernel.org
State Not Applicable
Headers show

Commit Message

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(+)


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);