Messages in this thread Patch in this message | | | From | Yinghai Lu <> | Subject | [PATCH v2 18/26] genirq: Bail out early in free_desc() | Date | Fri, 8 Feb 2013 11:28:15 -0800 |
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We pre-reserve irq range for hot-added ioapic, and later only some are used via realloc. So during hot-remove, we need to clear bits in allocated_irqs for both case.
Check if the irq_desc is there at first, and bail out early if irq_desc is not allocated yet.
So we can use irq_free_descs to clear allocated_irqs bits for preserved irqs.
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 b48f65b..32f099e 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -170,6 +170,9 @@ 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); -- 1.7.10.4
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