linux-kernel - Re: [PATCH 1/2] iommu/vt-d: break the for loop if an empty ir

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Date:	Tue, 29 Sep 2015 15:50:34 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Baoquan He <bhe@...hat.com>
Cc:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] iommu/vt-d: break the for loop if an empty ir_ioapic
 entry found

On Tue, Sep 29, 2015 at 03:26:08PM +0800, Baoquan He wrote:
> No need to continue the loop after it has been found.
> 
> Signed-off-by: Baoquan He <bhe@...hat.com>
> ---
>  drivers/iommu/intel_irq_remapping.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
> index 9ec4e0d..37b93f5 100644
> --- a/drivers/iommu/intel_irq_remapping.c
> +++ b/drivers/iommu/intel_irq_remapping.c
> @@ -841,8 +841,10 @@ static int ir_parse_one_ioapic_scope(struct acpi_dmar_device_scope *scope,
>  		if (ir_ioapic[count].iommu == iommu &&
>  		    ir_ioapic[count].id == scope->enumeration_id)
>  			return 0;
> -		else if (ir_ioapic[count].iommu == NULL && free == -1)
> +		else if (ir_ioapic[count].iommu == NULL && free == -1) {
>  			free = count;
> +			break;
> +		}
>  	}

The purpose of the loop is also to avoid duplicate entries, so we need
to search it till the end, no?



	Joerg

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