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    Subject[PATCH 5.15 118/779] genirq: Dont return error on missing optional irq_request_resources()
    Date
    From: Antonio Borneo <antonio.borneo@foss.st.com>

    [ Upstream commit 95001b756467ecc9f5973eb5e74e97699d9bbdf1 ]

    Function irq_chip::irq_request_resources() is reported as optional
    in the declaration of struct irq_chip.
    If the parent irq_chip does not implement it, we should ignore it
    and return.

    Don't return error if the functions is missing.

    Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
    Signed-off-by: Marc Zyngier <maz@kernel.org>
    Link: https://lore.kernel.org/r/20220512160544.13561-1-antonio.borneo@foss.st.com
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    kernel/irq/chip.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
    index a98bcfc4be7b..f3920374f71c 100644
    --- a/kernel/irq/chip.c
    +++ b/kernel/irq/chip.c
    @@ -1516,7 +1516,8 @@ int irq_chip_request_resources_parent(struct irq_data *data)
    if (data->chip->irq_request_resources)
    return data->chip->irq_request_resources(data);

    - return -ENOSYS;
    + /* no error on missing optional irq_chip::irq_request_resources */
    + return 0;
    }
    EXPORT_SYMBOL_GPL(irq_chip_request_resources_parent);

    --
    2.35.1


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