linux-kernel - Re: [PATCH] powerpc/smp: Do not disable IPI interrupts during suspend

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Date:	Fri, 27 Jul 2012 16:58:38 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Zhao Chenhui <chenhui.zhao@...escale.com>,
	"linuxppc-dev@...ts.ozlabs.org list" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org list" <linux-kernel@...r.kernel.org>,
	Li Yang <leoli@...escale.com>
Subject: Re: [PATCH] powerpc/smp: Do not disable IPI interrupts during suspend


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@...escale.com>
> Signed-off-by: Li Yang <leoli@...escale.com>
> ---
> arch/powerpc/kernel/smp.c |    2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)

BenH,

Can you ack?

- 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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