netdev - [PATCH net-next-2.6] net: Fix rxq ref counting

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Message-ID: <alpine.DEB.1.00.1010071304240.4792@pokey.mtv.corp.google.com>
Date:	Thu, 7 Oct 2010 13:09:10 -0700 (PDT)
From:	Tom Herbert <therbert@...gle.com>
To:	davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH net-next-2.6] net: Fix rxq ref counting

The rx->count reference is used to track reference counts to the
number of rx-queue kobjects created for the device.  This patch
eliminates initialization of the counter in netif_alloc_rx_queues
and instead increments the counter each time a kobject is created.
This is now symmetric with the decrement that is done when an object is
released.

Signed-off-by: Tom Herbert <therbert@...gle.com>
---
diff --git a/net/core/dev.c b/net/core/dev.c
index 7d14955..58b31d1 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5026,7 +5026,6 @@ static int netif_alloc_rx_queues(struct net_device *dev)
 			return -ENOMEM;
 		}
 		dev->_rx = rx;
-		atomic_set(&rx->count, count);
 
 		/*
 		 * Set a pointer to first element in the array which holds the
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index fa81fd0..b143173 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -726,6 +726,7 @@ static struct kobj_type rx_queue_ktype = {
 static int rx_queue_add_kobject(struct net_device *net, int index)
 {
 	struct netdev_rx_queue *queue = net->_rx + index;
+	struct netdev_rx_queue *first = queue->first;
 	struct kobject *kobj = &queue->kobj;
 	int error = 0;
 
@@ -738,6 +739,7 @@ static int rx_queue_add_kobject(struct net_device *net, int index)
 	}
 
 	kobject_uevent(kobj, KOBJ_ADD);
+	atomic_inc(&first->count);
 
 	return error;
 }
--
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