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

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Message-Id: <1318319438-7159-1-git-send-email-gaowanlong@cn.fujitsu.com>
Date:	Tue, 11 Oct 2011 15:50:38 +0800
From:	Wanlong Gao <gaowanlong@...fujitsu.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, Wanlong Gao <gaowanlong@...fujitsu.com>,
	Gao feng <gaofeng@...fujitsu.com>
Subject: [PATCH] netconsole: enable netconsole can make net_device refcnt

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 |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index ed2a397..4e6323df 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -307,6 +307,8 @@ static ssize_t store_enabled(struct netconsole_target *nt,
 		return err;
 	if (enabled < 0 || enabled > 1)
 		return -EINVAL;
+	if (enabled == nt->enabled)
+		return err;
 
 	if (enabled) {	/* 1 */
 
-- 
1.7.7.rc1

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