linux-kernel - Re: [PATCH] iommu: fix return error code in iommu_probe

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Date:   Tue, 17 Nov 2020 17:40:25 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Yang Yingliang <yangyingliang@...wei.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Cc:     baolu.lu@...ux.intel.com
Subject: Re: [PATCH] iommu: fix return error code in iommu_probe_device()

Hi Yingliang,

On 2020/11/17 10:52, Yang Yingliang wrote:
> If iommu_group_get() failed, it need return error code
> in iommu_probe_device().
> 
> Fixes: cf193888bfbd ("iommu: Move new probe_device path...")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>   drivers/iommu/iommu.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index b53446bb8c6b..6f4a32df90f6 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -253,8 +253,10 @@ int iommu_probe_device(struct device *dev)
>   		goto err_out;
>   
>   	group = iommu_group_get(dev);
> -	if (!group)
> +	if (!group) {
> +		ret = -ENODEV;

Can you please explain why you use -ENODEV here?

Best regards,
baolu

>   		goto err_release;
> +	}
>   
>   	/*
>   	 * Try to allocate a default domain - needs support from the
>