linux-kernel - [PATCH UPDATED 38/62] macvtap: convert to idr

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Date:	Sat, 2 Feb 2013 17:25:24 -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,
	Jason Wang <jasowang@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>
Subject: [PATCH UPDATED 38/62] macvtap: convert to idr_alloc()

Convert to the much saner new idr interface.

Only compile tested.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Jason Wang <jasowang@...hat.com>
Cc: Michael S. Tsirkin <mst@...hat.com>
---
Went out with the wrong subject.  This is the same patch with the
correct subject.

Thanks.

This patch depends on an earlier idr changes and I think it would be
best to route these together through -mm.  Please holler if there's
any objection.  Thanks.

 drivers/net/macvtap.c | 21 +++++----------------
 1 file changed, 5 insertions(+), 16 deletions(-)

diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 0f0f9ce..2497f6f 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -279,28 +279,17 @@ static int macvtap_receive(struct sk_buff *skb)
 static int macvtap_get_minor(struct macvlan_dev *vlan)
 {
 	int retval = -ENOMEM;
-	int id;
 
 	mutex_lock(&minor_lock);
-	if (idr_pre_get(&minor_idr, GFP_KERNEL) == 0)
-		goto exit;
-
-	retval = idr_get_new_above(&minor_idr, vlan, 1, &id);
-	if (retval < 0) {
-		if (retval == -EAGAIN)
-			retval = -ENOMEM;
-		goto exit;
-	}
-	if (id < MACVTAP_NUM_DEVS) {
-		vlan->minor = id;
-	} else {
+	retval = idr_alloc(&minor_idr, vlan, 1, MACVTAP_NUM_DEVS, GFP_KERNEL);
+	if (retval >= 0) {
+		vlan->minor = retval;
+	} else if (retval == -ENOSPC) {
 		printk(KERN_ERR "too many macvtap devices\n");
 		retval = -EINVAL;
-		idr_remove(&minor_idr, id);
 	}
-exit:
 	mutex_unlock(&minor_lock);
-	return retval;
+	return retval < 0 ? retval : 0;
 }
 
 static void macvtap_free_minor(struct macvlan_dev *vlan)
-- 
1.8.1

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