Messages in this thread | | | Date | Fri, 31 Dec 2010 02:39:25 -0800 | From | Abhijeet Dharmapurikar <> | Subject | Re: [PATCH] GIC: Assign correct flow handler type in set_type callback |
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On 12/29/2010 10:27 PM, Rabin Vincent wrote: > On Thu, Dec 30, 2010 at 10:59 AM, Abhijeet Dharmapurikar > <adharmap@codeaurora.org> wrote: >> There are some interrupts that are true edge triggered in nature. If not >> marked IRQ_PENDING, when disabled, they will be lost. >> >> Use the set_type callback to assign the correct flow type handler for >> shared peripheral interrupts. >> >> Signed-off-by: Abhijeet Dharmapurikar<adharmap@codeaurora.org> >> --- >> This came to light when a edge triggered interrupt was supposed to wakeup the >> sytem. The flow handler was set to the default handle_level_irq. On the resume >> path the flow handler was invoked right after the I bit was cleared but before >> each individual interrupts were enabled. This made the handle_level_irq ignore > > Why does the flow handler hit when the interrupt is disabled? Have you set > IRQF_NOSUSPEND on this interrupt? > Since GIC doesnt have disable callback it implements lazy disabling. The interrupt is only marked IRQ_DISABLED in the descriptor but is not masked in the GIC. Hence the interrupt flow handler is hit.
Now that I re-read the code setting IRQF_NO_SUSPEND would fix the issue. But shouldnt set_irq_wake() do something similar?
Do I need to request IRQF_NO_SUSPEND for all the interrupts that could possibly wakeup the system - seems a bit unnecessary. IMO the interrupt should not be disabled if it is marked IRQF_NO_SUPEND || IRQ_WAKEUP is set.
Abhijeet
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