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    Subject[ 17/38] genirq: Fix can_request_irq() for IRQs without an action
    Date
    3.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Ben Hutchings <ben@decadent.org.uk>

    commit 2779db8d37d4b542d9ca2575f5f178dbeaca6c86 upstream.

    Commit 02725e7471b8 ('genirq: Use irq_get/put functions'),
    inadvertently changed can_request_irq() to return 0 for IRQs that have
    no action. This causes pcibios_lookup_irq() to select only IRQs that
    already have an action with IRQF_SHARED set, or to fail if there are
    none. Change can_request_irq() to return 1 for IRQs that have no
    action (if the first two conditions are met).

    Reported-by: Bjarni Ingi Gislason <bjarniig@rhi.hi.is>
    Tested-by: Bjarni Ingi Gislason <bjarniig@rhi.hi.is> (against 3.2)
    Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
    Cc: 709647@bugs.debian.org
    Link: http://bugs.debian.org/709647
    Link: http://lkml.kernel.org/r/1372383630.23847.40.camel@deadeye.wl.decadent.org.uk
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    kernel/irq/manage.c | 6 +++---
    1 file changed, 3 insertions(+), 3 deletions(-)

    --- a/kernel/irq/manage.c
    +++ b/kernel/irq/manage.c
    @@ -555,9 +555,9 @@ int can_request_irq(unsigned int irq, un
    return 0;

    if (irq_settings_can_request(desc)) {
    - if (desc->action)
    - if (irqflags & desc->action->flags & IRQF_SHARED)
    - canrequest =1;
    + if (!desc->action ||
    + irqflags & desc->action->flags & IRQF_SHARED)
    + canrequest = 1;
    }
    irq_put_desc_unlock(desc, flags);
    return canrequest;



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