Openmoko Bug #2240: removing/reloading g_ether not working

[Openmoko Public Trac]

#2240: removing/reloading g_ether not working
-------------------------+--------------------------------------------------
 Reporter:  frankmpunkt  |          Owner:  openmoko-devel
     Type:  defect       |         Status:  new           
 Priority:  high         |      Milestone:                
Component:  unknown      |        Version:  unspecified   
 Severity:  normal       |       Keywords:                
 Haspatch:  0            |      Blockedby:                
Estimated:               |    Patchreview:                
 Blocking:               |   Reproducible:                
-------------------------+--------------------------------------------------

Comment(by lindi):

 When ifconfig usb0 up is called. dev->netdev_ops contains a bogus
 ndo_get_stats pointer:
 {{{
 Breakpoint 5, dev_get_stats (dev=0xc6e48000) at
 /local/lindi/neolinux/net/core/dev.c:4649
 (gdb) p *dev->netdev_ops
 $9 = {
   ndo_init = 0xe1a0c00d,
   ndo_uninit = 0xe92dd800,
   ndo_open = 0xe24cb004,
   ndo_stop = 0xe5d03030,
   ndo_start_xmit = 0xe35300fd,
   ndo_select_queue = 0x92833001,
   ndo_change_rx_flags = 0x920330ff,
   ndo_set_rx_mode = 0x95c03030,
   ndo_set_multicast_list = 0x83e00012,
   ndo_set_mac_address = 0x91a00003,
   ndo_validate_addr = 0xe89da800,
   ndo_do_ioctl = 0xe1a0c00d,
   ndo_set_config = 0xe92dd810,
   ndo_change_mtu = 0xe24cb004,
   ndo_neigh_setup = 0xe3a03000,
   ndo_tx_timeout = 0xe1a04000,
   ndo_get_stats = 0xea000003,
   ndo_vlan_rx_register = 0xe1500002,
   ndo_vlan_rx_add_vid = 0x1a000001,
   ndo_vlan_rx_kill_vid = 0xe59c0000
 }
 }}}
 The backtrace to this call is
 {{{
 #0  dev_get_stats (dev=0xc6e48000) at
 /local/lindi/neolinux/net/core/dev.c:4649
 #1  0xc023acc8 in rtnl_fill_ifinfo (skb=0xc7a6bd60, dev=0xc6e48000,
 type=<value optimized out>, pid=<value optimized out>, seq=1240760974,
 change=0, flags=<value optimi\
 zed out>) at /local/lindi/neolinux/net/core/rtnetlink.c:669
 #2  0xc023ae3c in rtnl_dump_ifinfo (skb=0xc7a6bd60, cb=0xc7a976e0) at
 /local/lindi/neolinux/net/core/rtnetlink.c:695
 #3  0xc0246428 in netlink_dump (sk=0xc6f05000) at
 /local/lindi/neolinux/net/netlink/af_netlink.c:1550
 #4  0xc0247044 in netlink_dump_start (ssk=0xc7840c00, skb=<value optimized
 out>, nlh=0xc6c13e00, dump=<value optimized out>, done=0) at
 /local/lindi/neolinux/net/netlin\
 k/af_netlink.c:1629
 #5  0xc023b798 in rtnetlink_rcv_msg (skb=0xc7a6be20, nlh=0xc6c13e00) at
 /local/lindi/neolinux/net/core/rtnetlink.c:1301
 #6  0xc0248880 in netlink_rcv_skb (skb=0xc7a6be20, cb=0xc023b6b8
 <rtnetlink_rcv_msg>) at
 /local/lindi/neolinux/net/netlink/af_netlink.c:1697
 #7  0xc023b6a8 in rtnetlink_rcv (skb=0xc7a6be20) at
 /local/lindi/neolinux/net/core/rtnetlink.c:1337
 #8  0xc024829c in netlink_unicast (ssk=0xc6f05000, skb=0xc7a6be20, pid=0,
 nonblock=<value optimized out>) at
 /local/lindi/neolinux/net/netlink/af_netlink.c:870
 #9  0xc02485ec in netlink_sendmsg (kiocb=<value optimized out>,
 sock=0xc3413480, msg=0xc6edff54, len=20) at
 /local/lindi/neolinux/net/netlink/af_netlink.c:1285
 #10 0xc02217c0 in sock_sendmsg (sock=<value optimized out>,
 msg=0xc6edff54, size=96) at /local/lindi/neolinux/net/socket.c:563
 #11 0xc0221a90 in sys_sendto (fd=<value optimized out>, buff=0xc6edfed4,
 len=20, flags=0, addr=0xbe8fd548, addr_len=12) at
 /local/lindi/neolinux/net/socket.c:1651
 #12 0xc002eea0 in kuser_cmpxchg_fixup ()
 }}}

-- 
Ticket URL: <https://docs.openmoko.org/trac/ticket/2240#comment:2>
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