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    Subject[PATCH AUTOSEL 4.20 30/81] irqchip/gic-v3-its: Gracefully fail on LPI exhaustion
    Date
    From: Marc Zyngier <marc.zyngier@arm.com>

    [ Upstream commit 45725e0fc3e7fe52fedb94f59806ec50e9618682 ]

    In the unlikely event that we cannot find any available LPI in the
    system, we should gracefully return an error instead of carrying
    on with no LPI allocated at all.

    Fixes: 38dd7c494cf6 ("irqchip/gic-v3-its: Drop chunk allocation compatibility")
    Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/irqchip/irq-gic-v3-its.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
    index f25ec92f23ee2..c3aba3fc818d3 100644
    --- a/drivers/irqchip/irq-gic-v3-its.c
    +++ b/drivers/irqchip/irq-gic-v3-its.c
    @@ -1586,6 +1586,9 @@ static unsigned long *its_lpi_alloc(int nr_irqs, u32 *base, int *nr_ids)
    nr_irqs /= 2;
    } while (nr_irqs > 0);

    + if (!nr_irqs)
    + err = -ENOSPC;
    +
    if (err)
    goto out;

    --
    2.19.1
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