linux-kernel - Re: [PATCH v5 10/33] iommu, irq: Allocate irq_desc for dmar

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Date:	Fri, 21 Feb 2014 15:43:15 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Tony Luck <tony.luck@...el.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, Joerg Roedel <joro@...tes.org>,
	Donald Dutile <ddutile@...hat.com>,
	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>,
	stable@...r.kernel.org
Subject: Re: [PATCH v5 10/33] iommu, irq: Allocate irq_desc for dmar_msi with
 local node



On 2014/1/3 8:05, Yinghai Lu wrote:
> iommu irq's irq_desc should be on local node ram.
> 
> Fix the return value checking problem.
>   create_irq() will return -1 when fail to allocate.
>   create_irq_nr() will return 0 when fail to allocate.
> here only check !irq, so need to change it to use create_irq_nr instead.
> 
> -v2: According to Sebastian, add cc to stable.
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Cc: Joerg Roedel <joro@...tes.org>
> Cc: Donald Dutile <ddutile@...hat.com>
> Acked-by: Donald Dutile <ddutile@...hat.com>
> Cc: Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
> Cc: stable@...r.kernel.org
> ---
>  drivers/iommu/dmar.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
> index 8b452c9..f4eaa50 100644
> --- a/drivers/iommu/dmar.c
> +++ b/drivers/iommu/dmar.c
> @@ -1277,7 +1277,7 @@ int dmar_set_interrupt(struct intel_iommu *iommu)
>  	if (iommu->irq)
>  		return 0;
>  
> -	irq = create_irq();
> +	irq = create_irq_nr(0, iommu->node);
Hi Yinghai,
	How about create_irq_nrq(1, iommu->node) here to clearly state
that 0 is not a valid irq number for dmar here?
Thanks!
Gerry

>  	if (!irq) {
>  		pr_err("IOMMU: no free vectors\n");
>  		return -EINVAL;
> 
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