挂载NFS文件系统DM9000报错

求大神给个解决思路或者方法！！跪谢！
在挂在NFS文件系统的时候，偶尔DM9000会报错。有时候在挂载上之后过一段时间报错：
错误错误有如下几种：
1、dm9000 dm9000.0: status check fail: 20
2、dm9000 dm9000.0: status check fail: 122
3、eth0: link up, 10Mbps, half-duplex, lpa 0x45E1
IP-Config: Complete:
     device=eth0, addr=192.168.0.12, mask=255.255.255.0, gw=192.168.0.1,
     host=www, domain=, nis-domain=(none),
     bootserver=192.168.0.104, rootserver=192.168.0.104, rootpath=
Looking up port of RPC 100003/2 on 192.168.0.104
------------[ cut here ]------------
WARNING: at net/sched/sch_generic.c:226 dev_watchdog+0x13c/0x224()
NETDEV WATCHDOG: eth0 (dm9000): transmit timed out
Modules linked in:
[<c004c700>] (unwind_backtrace+0x0/0xdc) from [<c00654ac>] (warn_slowpath_common+0x44/0x5c)
[<c00654ac>] (warn_slowpath_common+0x44/0x5c) from [<c00654fc>] (warn_slowpath_fmt+0x24/0x30)
[<c00654fc>] (warn_slowpath_fmt+0x24/0x30) from [<c02c5998>] (dev_watchdog+0x13c/0x224)
[<c02c5998>] (dev_watchdog+0x13c/0x224) from [<c006de8c>] (run_timer_softirq+0x154/0x1e8)
[<c006de8c>] (run_timer_softirq+0x154/0x1e8) from [<c0069d24>] (__do_softirq+0x60/0xe8)
[<c0069d24>] (__do_softirq+0x60/0xe8) from [<c0046050>] (_text+0x50/0x64)
[<c0046050>] (_text+0x50/0x64) from [<c0046964>] (__irq_svc+0x24/0xa0)
Exception stack(0xc0453f78 to 0xc0453fc0)
3f60:                                                       c0458f78 00000032
3f80: f4100000 60000013 c0047d80 c0452000 c0022ee8 c0455c80 3002121c 41129200
3fa0: 300211e8 00000000 c0454e98 c0453fc0 c0047dd8 c0047de4 60000013 ffffffff
[<c0046964>] (__irq_svc+0x24/0xa0) from [<c0047dd8>] (default_idle+0x58/0x6c)
[<c0047dd8>] (default_idle+0x58/0x6c) from [<c00482e4>] (cpu_idle+0x3c/0x58)
[<c00482e4>] (cpu_idle+0x3c/0x58) from [<c0008a50>] (start_kernel+0x234/0x284)
[<c0008a50>] (start_kernel+0x234/0x284) from [<30008034>] (0x30008034)
---[ end trace f0924dc79f806ea3 ]---