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    SubjectRe: [PATCH v3 2/4] genirq: Inform handler about line sharing state
    Am 14.12.2010 22:46, Thomas Gleixner wrote:
    > On Mon, 13 Dec 2010, Jan Kiszka wrote:
    >> From: Jan Kiszka <jan.kiszka@siemens.com>
    >> chip_bus_lock(desc);
    >> retval = __setup_irq(irq, desc, action);
    >> chip_bus_sync_unlock(desc);
    >>
    >> - if (retval)
    >> + if (retval) {
    >> + if (desc->action && !desc->action->next)
    >> + desc->irq_data.drv_status &= ~IRQS_SHARED;
    >
    > This is redundant. IRQS_SHARED gets set in a code path where all
    > checks are done already.

    Nope, it's also set before entry of __setup_irq in case we call an
    IRQF_ADAPTIVE handler.

    We need to set it that early as we may race with IRQ events for the
    already registered handler happening between the sharing notification
    and the actual registration of the second handler.

    Jan

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