linux-kernel - Re: [PATCH] vfio/type1: Use the new helper to find vfio

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Message-ID: <20201103111801.05d4cee5@w520.home>
Date:   Tue, 3 Nov 2020 11:18:01 -0700
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Zenghui Yu <yuzenghui@...wei.com>
Cc:     <cohuck@...hat.com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <wanghaibin.wang@...wei.com>
Subject: Re: [PATCH] vfio/type1: Use the new helper to find vfio_group

On Thu, 22 Oct 2020 20:24:17 +0800
Zenghui Yu <yuzenghui@...wei.com> wrote:

> When attaching a new group to the container, let's use the new helper
> vfio_iommu_find_iommu_group() to check if it's already attached. There
> is no functional change.
> 
> Also take this chance to add a missing blank line.
> 
> Signed-off-by: Zenghui Yu <yuzenghui@...wei.com>
> ---
>  drivers/vfio/vfio_iommu_type1.c | 17 +++++------------
>  1 file changed, 5 insertions(+), 12 deletions(-)


Applied to vfio for-linus branch for v5.10.  Thanks,

Alex

> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
> index a05d856ae806..aa586bd684da 100644
> --- a/drivers/vfio/vfio_iommu_type1.c
> +++ b/drivers/vfio/vfio_iommu_type1.c
> @@ -1997,6 +1997,7 @@ static void vfio_iommu_iova_insert_copy(struct vfio_iommu *iommu,
>  
>  	list_splice_tail(iova_copy, iova);
>  }
> +
>  static int vfio_iommu_type1_attach_group(void *iommu_data,
>  					 struct iommu_group *iommu_group)
>  {
> @@ -2013,18 +2014,10 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
>  
>  	mutex_lock(&iommu->lock);
>  
> -	list_for_each_entry(d, &iommu->domain_list, next) {
> -		if (find_iommu_group(d, iommu_group)) {
> -			mutex_unlock(&iommu->lock);
> -			return -EINVAL;
> -		}
> -	}
> -
> -	if (iommu->external_domain) {
> -		if (find_iommu_group(iommu->external_domain, iommu_group)) {
> -			mutex_unlock(&iommu->lock);
> -			return -EINVAL;
> -		}
> +	/* Check for duplicates */
> +	if (vfio_iommu_find_iommu_group(iommu, iommu_group)) {
> +		mutex_unlock(&iommu->lock);
> +		return -EINVAL;
>  	}
>  
>  	group = kzalloc(sizeof(*group), GFP_KERNEL);