网卡驱动的问题,网卡收到包传给另一个设备

在网卡收到包之后,我把sk_buff 用skb_copy 拷贝了一份, 然后传给下面这个函数, 一运行系统就崩溃了.请各位高手给看一下.

int mng_send_from_adapter(struct sk_buff *skb)
{
struct net_device *dev;
struct sk_buff *skb_adapter;
dev = dev_get_by_name(mng_ifs[current_if]);



if(!dev) {
printk(KERN_INFO\"mng_sedn(): could not get management interface %s is down.\\n\",
   mng_ifs[current_if]);
if( 2 == if_count )
{
current_if = (0==current_if)?1:0;
dev = dev_get_by_name(mng_ifs[current_if]);
if(!dev)
{
printk(KERN_INFO\"mng_sedn(): could not get management interface %s is down.\\n\",
mng_ifs[current_if]);
return -EOP_NODEV;
}
}
else
return -EOP_NODEV;
}

if(!(dev->flags & IFF_UP)){
printk(KERN_INFO\"mng_send(): management interface %s is down.\\n\",
mng_ifs[current_if]);
if( 2 == if_count )
{
current_if = (0==current_if)?1:0;
dev = dev_get_by_name(mng_ifs[current_if]);
if(!dev)
{
printk(KERN_INFO\"mng_sedn(): could not get management interface %s is down.\\n\",
mng_ifs[current_if]);
return -EOP_NODEV;
}
if(!(dev->flags & IFF_UP))
{
printk(KERN_INFO\"mng_send(): management interface %s is down.\\n\",
mng_ifs[current_if]);
dev_put(dev);
return -EOP_IFFAIL;
}
}
else
{
dev_put(dev);
return -EOP_IFFAIL;
}
}

if(copy_from_user(skb_adapter, skb, sizeof(struct sk_buff)))
{
printk(KERN_INFO\"mng_send_from_adapter(): couldn\'t read ophir_mng_send_from_adapter.\\n\");
return -EFAULT;
}

skb_adapter->dev = dev;

if (dev->hard_header &&
   dev->hard_header(skb_adapter,dev, ETH_P_OPHIR_MNG, OPAR_MAC, dev->dev_addr,skb_adapter->len) < 0){
dev_put(dev);
return -EOP_IFFAIL;
}

if (skb_adapter)
{
   if(dev_queue_xmit(skb_adapter) != 0)
   {
printk(KERN_INFO\"mng_send_from_adapter(): send failed.\\n\");
dev_put(dev);
return -EOP_IFFAIL;
   }
        }

dev_put(dev);
return 1;
}

信息太少，你给一下错误信息/以及你的这部分代码的运行的级别，interrupt/bh/user context，你的代码只有在user context下 copy_from_user才一定不错。