linux-kernel - Re: [Patch Part3 V5 6/8] iommu/vt-d: Enhance error recovery in function intel_enable_irq

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Date:	Mon, 15 Sep 2014 10:25:04 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Joerg Roedel <joro@...tes.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>,
	"Bjorn Helgaas" <bhelgaas@...gle.com>,
	Dan Williams <dan.j.williams@...el.com>,
	"Vinod Koul" <vinod.koul@...el.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
CC:	Ashok Raj <ashok.raj@...el.com>, Tony Luck <tony.luck@...el.com>,
	<iommu@...ts.linux-foundation.org>, <linux-pci@...r.kernel.org>,
	<linux-hotplug@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<dmaengine@...r.kernel.org>
Subject: Re: [Patch Part3 V5 6/8] iommu/vt-d: Enhance error recovery in function
 intel_enable_irq_remapping()

On 2014/9/12 10:10, Jiang Liu wrote:
> Enhance error recovery in function intel_enable_irq_remapping()
> by tearing down all created data structures.
> 
> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
> ---
>  drivers/iommu/intel_irq_remapping.c |    8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
> index 7cf31a29f77a..81f110aae6df 100644
> --- a/drivers/iommu/intel_irq_remapping.c
> +++ b/drivers/iommu/intel_irq_remapping.c
> @@ -701,9 +701,11 @@ static int __init intel_enable_irq_remapping(void)
>  	return eim ? IRQ_REMAP_X2APIC_MODE : IRQ_REMAP_XAPIC_MODE;
>  
>  error:
> -	/*
> -	 * handle error condition gracefully here!
> -	 */
> +	for_each_iommu(iommu, drhd)
> +		if (ecap_ir_support(iommu->ecap)) {
> +			iommu_disable_irq_remapping(iommu);
> +			intel_teardown_irq_remapping(iommu);
> +		}
>  
>  	if (x2apic_present)
>  		pr_warn("Failed to enable irq remapping.  You are vulnerable to irq-injection attacks.\n");

Reviewed-by: Yijing Wang <wangyijing@...wei.com>


> 


-- 
Thanks!
Yijing

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