我在ARM9开发板上做CAN通信测试，驱动是自己改的，测试时虽然接收数据正确了，但中间伴有警告信息，不知何故？
can test start                                                                  
init mcp2510 over                                                               
state ok                                                                        
Open device success.                                                            
send datagram.                                                                  
the data sended is abcd1234.                                                   
data_receive.BufNo = 3                                                         
data_receive.IdType = 0                                                         
data_receive.id = 23
dTrying to free nonexistent resource         
Trying to free nonexistent resource          
Trying to free nonexistent resource          
------------[ cut here ]------------                                            
WARNING: at kernel/irq/manage.c:735 __free_irq+0x114/0x1c0()                    
Trying to free already-free IRQ 20                                             
Modules linked in: candrv ov9650 zd1211rw rt73usb rt2x00usb rt2x00lib mac80211 v
Backtrace:
...
---[ end trace eaef40f5fe83d0b7 ]---                                            
ata_receive.DataLen = 8                                                         
data_receive.data = abcd1234

有两点建议：
1. dev->IrqNum和eint_irq是相等
2. 没必要每次打开的时候都重新申请资源， 关闭时候释放资源，
   只需要在 init 时候 申请， exit 时候释放即可。
   反复申请和释放中断，可能会出现问题。

你确定dev->IrqNum和eint_irq是相等的吗？打印出来看看。