RE: [PATCH 2/5] vfio: Do not open code the group list search in vfio_create_group()

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> From: Jason Gunthorpe <jgg@xxxxxxxxxx>
> Sent: Saturday, October 2, 2021 7:22 AM
> 
> Split vfio_group_get_from_iommu() into __vfio_group_get_from_iommu() so
> that vfio_create_group() can call it to consolidate this duplicated code.

Reviewed-by: Liu Yi L <yi.l.liu@xxxxxxxxx>

Regards,
Yi Liu

> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
> ---
>  drivers/vfio/vfio.c | 55 ++++++++++++++++++++++++---------------------
>  1 file changed, 30 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
> index 32a53cb3598524..1cb12033b02240 100644
> --- a/drivers/vfio/vfio.c
> +++ b/drivers/vfio/vfio.c
> @@ -344,10 +344,35 @@ static void vfio_group_unlock_and_free(struct
> vfio_group *group)
>  /**
>   * Group objects - create, release, get, put, search
>   */
> +static struct vfio_group *
> +__vfio_group_get_from_iommu(struct iommu_group *iommu_group)
> +{
> +	struct vfio_group *group;
> +
> +	list_for_each_entry(group, &vfio.group_list, vfio_next) {
> +		if (group->iommu_group == iommu_group) {
> +			vfio_group_get(group);
> +			return group;
> +		}
> +	}
> +	return NULL;
> +}
> +
> +static struct vfio_group *
> +vfio_group_get_from_iommu(struct iommu_group *iommu_group)
> +{
> +	struct vfio_group *group;
> +
> +	mutex_lock(&vfio.group_lock);
> +	group = __vfio_group_get_from_iommu(iommu_group);
> +	mutex_unlock(&vfio.group_lock);
> +	return group;
> +}
> +
>  static struct vfio_group *vfio_create_group(struct iommu_group
> *iommu_group,
>  		enum vfio_group_type type)
>  {
> -	struct vfio_group *group, *tmp;
> +	struct vfio_group *group, *existing_group;
>  	struct device *dev;
>  	int ret, minor;
> 
> @@ -378,12 +403,10 @@ static struct vfio_group *vfio_create_group(struct
> iommu_group *iommu_group,
>  	mutex_lock(&vfio.group_lock);
> 
>  	/* Did we race creating this group? */
> -	list_for_each_entry(tmp, &vfio.group_list, vfio_next) {
> -		if (tmp->iommu_group == iommu_group) {
> -			vfio_group_get(tmp);
> -			vfio_group_unlock_and_free(group);
> -			return tmp;
> -		}
> +	existing_group = __vfio_group_get_from_iommu(iommu_group);
> +	if (existing_group) {
> +		vfio_group_unlock_and_free(group);
> +		return existing_group;
>  	}
> 
>  	minor = vfio_alloc_group_minor(group);
> @@ -440,24 +463,6 @@ static void vfio_group_get(struct vfio_group *group)
>  	kref_get(&group->kref);
>  }
> 
> -static
> -struct vfio_group *vfio_group_get_from_iommu(struct iommu_group
> *iommu_group)
> -{
> -	struct vfio_group *group;
> -
> -	mutex_lock(&vfio.group_lock);
> -	list_for_each_entry(group, &vfio.group_list, vfio_next) {
> -		if (group->iommu_group == iommu_group) {
> -			vfio_group_get(group);
> -			mutex_unlock(&vfio.group_lock);
> -			return group;
> -		}
> -	}
> -	mutex_unlock(&vfio.group_lock);
> -
> -	return NULL;
> -}
> -
>  static struct vfio_group *vfio_group_get_from_minor(int minor)
>  {
>  	struct vfio_group *group;
> --
> 2.33.0





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