netdev - [PATCH v2] netconsole: enable netconsole can make net

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Date:	Wed, 12 Oct 2011 10:08:11 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, eric.dumazet@...il.com, fbl@...hat.com,
	Gao feng <gaofeng@...fujitsu.com>
Subject: [PATCH v2] netconsole: enable netconsole can make net_device refcnt incorrent

There is no check if netconsole is enabled current.
so when exec echo 1 > enabled;
the reference of net_device will increment always.

Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
---
 drivers/net/netconsole.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index ed2a397..e888202 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -307,6 +307,11 @@ static ssize_t store_enabled(struct netconsole_target *nt,
 		return err;
 	if (enabled < 0 || enabled > 1)
 		return -EINVAL;
+	if (enabled == nt->enabled) {
+		printk(KERN_INFO "netconsole: network logging has already %s\n",
+				nt->enabled ? "started" : "stopped");
+		return -EINVAL;
+	}
 
 	if (enabled) {	/* 1 */
 
-- 
1.7.1

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