[PATCH] powerpc/smp: Do not disable IPI interrupts during suspend
Kumar Gala
galak at kernel.crashing.org
Sun Jul 29 00:03:00 EST 2012
On Jul 27, 2012, at 5:20 PM, Benjamin Herrenschmidt wrote:
> On Fri, 2012-07-27 at 16:58 -0500, Kumar Gala wrote:
>> On Jul 20, 2012, at 7:47 AM, Zhao Chenhui wrote:
>>
>>> During suspend, all interrupts including IPI will be disabled. In this case,
>>> the suspend process will hang in SMP. To prevent this, pass the flag
>>> IRQF_NO_SUSPEND when requesting IPI irq.
>>>
>>> Signed-off-by: Zhao Chenhui <chenhui.zhao at freescale.com>
>>> Signed-off-by: Li Yang <leoli at freescale.com>
>>> ---
>>> arch/powerpc/kernel/smp.c | 2 +-
>>> 1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> BenH,
>>
>> Can you ack?
>
> No I'll merge it but not until it's been in next for a bit unless you
> have some strong emergency there, it's on my mental list of things to
> shovel into next after rc1.
I wasn't clear, I was meaning for my 'next' tree, not 3.6. Trying to get these FSL PM patches into my 'next' for 3.7.
- k
> Curiosity: didn't we use to disable all non-boot CPUs on suspend ?
>
> Cheers,
> Ben.
>
>> - k
>>
>>>
>>> diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
>>> index fecb038..d26bbf8 100644
>>> --- a/arch/powerpc/kernel/smp.c
>>> +++ b/arch/powerpc/kernel/smp.c
>>> @@ -171,7 +171,7 @@ int smp_request_message_ipi(int virq, int msg)
>>> }
>>> #endif
>>> err = request_irq(virq, smp_ipi_action[msg],
>>> - IRQF_PERCPU | IRQF_NO_THREAD,
>>> + IRQF_PERCPU | IRQF_NO_THREAD | IRQF_NO_SUSPEND,
>>> smp_ipi_name[msg], 0);
>>> WARN(err < 0, "unable to request_irq %d for %s (rc %d)\n",
>>> virq, smp_ipi_name[msg], err);
>>> --
>>> 1.6.4.1
>>>
>
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