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Subject[PATCH v2 50/62] vfio: convert to idr_alloc()
Convert to the much saner new idr interface.

Only compile tested.

v2: Restore accidentally dropped "index 0" comment as suggested by
Alex.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Cc: kvm@vger.kernel.org
---
drivers/vfio/vfio.c | 17 +----------------
1 file changed, 1 insertion(+), 16 deletions(-)

--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -139,23 +139,8 @@ EXPORT_SYMBOL_GPL(vfio_unregister_iommu_
*/
static int vfio_alloc_group_minor(struct vfio_group *group)
{
- int ret, minor;
-
-again:
- if (unlikely(idr_pre_get(&vfio.group_idr, GFP_KERNEL) == 0))
- return -ENOMEM;
-
/* index 0 is used by /dev/vfio/vfio */
- ret = idr_get_new_above(&vfio.group_idr, group, 1, &minor);
- if (ret == -EAGAIN)
- goto again;
- if (ret || minor > MINORMASK) {
- if (minor > MINORMASK)
- idr_remove(&vfio.group_idr, minor);
- return -ENOSPC;
- }
-
- return minor;
+ return idr_alloc(&vfio.group_idr, group, 1, MINORMASK + 1, GFP_KERNEL);
}

static void vfio_free_group_minor(int minor)

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