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    Subject[PATCHv4 1/6] msi: Relax msi_domain_alloc() to support parentless MSI irqdomains
    Date
    From: Liu Jiang <jiang.liu@linux.intel.com>

    Previously msi_domain_alloc() assumes MSI irqdomains always have parent
    irqdomains, but that's not true for the new Intel VMD devices. So relax
    msi_domain_alloc() to support parentless MSI irqdomains.

    Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
    Signed-off-by: Liu Jiang <jiang.liu@linux.intel.com>
    ---
    kernel/irq/msi.c | 8 +++++---
    1 file changed, 5 insertions(+), 3 deletions(-)

    diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
    index be9149f..01644d4 100644
    --- a/kernel/irq/msi.c
    +++ b/kernel/irq/msi.c
    @@ -109,9 +109,11 @@ static int msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
    if (irq_find_mapping(domain, hwirq) > 0)
    return -EEXIST;

    - ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
    - if (ret < 0)
    - return ret;
    + if (domain->parent) {
    + ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
    + if (ret < 0)
    + return ret;
    + }

    for (i = 0; i < nr_irqs; i++) {
    ret = ops->msi_init(domain, info, virq + i, hwirq + i, arg);
    --
    2.6.2.307.g37023ba


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