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| author | Kirti Wankhede <kwankhede@nvidia.com> | 2016-11-17 02:16:16 +0530 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2016-11-17 08:24:55 -0700 |
| commit | 32f55d835b23830bf9295d038a1693ce9fd41b56 (patch) | |
| tree | 5d231067f5a85c60613671ccb864628c1d71f1d4 /drivers/vfio/vfio.c | |
| parent | 7ed3ea8a71187a4569eb65f647ea4af0cdb9a856 (diff) | |
| download | linux-32f55d835b23830bf9295d038a1693ce9fd41b56.tar.gz linux-32f55d835b23830bf9295d038a1693ce9fd41b56.tar.bz2 linux-32f55d835b23830bf9295d038a1693ce9fd41b56.zip | |
vfio: Common function to increment container_users
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>
Diffstat (limited to 'drivers/vfio/vfio.c')
| -rw-r--r-- | drivers/vfio/vfio.c | 34 |
1 files 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; + } + 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); |