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SubjectRe: [PATCH v10 04/19] vfio: Common function to increment container_users
On 10/27/2016 05:29 AM, Kirti Wankhede wrote:
> This change rearrange functions to have common function to increment
> container_users
>
> Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
> Signed-off-by: Neo Jia <cjia@nvidia.com>
> Change-Id: I8bdeb352bc8439b107ffd519480fd4dc238677f2
> ---
> drivers/vfio/vfio.c | 34 +++++++++++++++++++++-------------
> 1 file changed, 21 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
> index 23bc86c1d05d..2e83bdf007fe 100644
> --- a/drivers/vfio/vfio.c
> +++ b/drivers/vfio/vfio.c
> @@ -1385,6 +1385,23 @@ static bool vfio_group_viable(struct vfio_group *group)
> group, vfio_dev_viable) == 0);
> }
>
> +static int vfio_group_add_container_user(struct vfio_group *group)
> +{
> + if (!atomic_inc_not_zero(&group->container_users))
> + return -EINVAL;
> +
> + if (group->noiommu) {
> + atomic_dec(&group->container_users);
> + return -EPERM;
> + }

trivial: a blank line here

> + if (!group->container->iommu_driver || !vfio_group_viable(group)) {
> + atomic_dec(&group->container_users);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> static const struct file_operations vfio_device_fops;
>
> static int vfio_group_get_device_fd(struct vfio_group *group, char *buf)
> @@ -1694,23 +1711,14 @@ static const struct file_operations vfio_device_fops = {
> struct vfio_group *vfio_group_get_external_user(struct file *filep)
> {
> struct vfio_group *group = filep->private_data;
> + int ret;
>
> if (filep->f_op != &vfio_group_fops)
> return ERR_PTR(-EINVAL);
>
> - if (!atomic_inc_not_zero(&group->container_users))
> - return ERR_PTR(-EINVAL);
> -
> - if (group->noiommu) {
> - atomic_dec(&group->container_users);
> - return ERR_PTR(-EPERM);
> - }
> -
> - if (!group->container->iommu_driver ||
> - !vfio_group_viable(group)) {
> - atomic_dec(&group->container_users);
> - return ERR_PTR(-EINVAL);
> - }
> + ret = vfio_group_add_container_user(group);
> + if (ret)
> + return ERR_PTR(ret);
>
> vfio_group_get(group);
>

Reviewed-by: Jike Song <jike.song@intel.com>

--
Thanks,
Jike

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