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    Subject[PATCH v2 18/26] genirq: Bail out early in free_desc()
    Date
    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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