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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@cn.fujitsu.com>
Acked-by: Flavio Leitner <fbl@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gao feng 2011-10-11 16:08:11 +00:00 committed by David S. Miller
parent 6230c9b4f8
commit d5123480b1
1 changed files with 5 additions and 0 deletions
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5
drivers/net/netconsole.c
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@ -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 */