Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-11 06:31:49 +00:00
Code Issues Packages Projects Releases Wiki Activity

vfio: Common function to increment container_users

Browse Source 
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>
Reviewed-by: Jike Song <jike.song@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Kirti Wankhede 2016-11-17 02:16:16 +05:30 committed by Alex Williamson
parent 7ed3ea8a71
commit 32f55d835b
1 changed files with 21 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/vfio/vfio.c
View File

@ -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;
}
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);