linux-kernel - [PATCH v2 50/62] vfio: convert to idr

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Date:	Mon, 4 Feb 2013 08:48:42 -0800
From:	Tejun Heo <tj@...nel.org>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, rusty@...tcorp.com.au,
	bfields@...ldses.org, skinsbursky@...allels.com,
	ebiederm@...ssion.com, jmorris@...ei.org, axboe@...nel.dk,
	Alex Williamson <alex.williamson@...hat.com>,
	kvm@...r.kernel.org
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@...nel.org>
Acked-by: Alex Williamson <alex.williamson@...hat.com>
Cc: kvm@...r.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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