Subject: [PATCH] netconsole: enable netconsole can make net_device refcnt incorrent

From: Gao feng <[email-masked]>
Date: Tue, 11 Oct 2011 14:29:12 +0800

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 <[email-masked]>
---
  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..4e6323d 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 */

-- 
1.7.1