2.6.19-rt14 e1000 shutdown problem

[Tim Chen <tim.c.chen@linux.intel.com>]

Ingo,

While trying out the 2.6.19.1-rt14 kernel with a 
x86_64 system with Clovertown processor, it hung when it 
was shutting down e1000 ethernet interface running the command:

/sbin/ip link set dev eth0 down

Same problem was also seen for 2.6.19.1-rt15.  The default 
kernel from your RPM was used. Sysreq was still working and 
call trace of the ip command using Sysreq-prtscr-t is listed below:

ip   D [ffff810139201040] ffff81013fe47840    0  3526 3433
(NOTLB)
 ffff81012ce75ba8 0000000000000086 0000000000000007 0000000000000297
 00000000000c4994 ffff810139201278 ffff810139201040 ffff81013fe47800
 0000005681bed269 0000000400000080 ffff81013fe47800 00000004802df143
Call Trace:
 [<ffffffff80265da0>] schedule+0xd8/0xfc
 [<ffffffff802a0bab>] flush_cpu_workqueue+0x72/0xa7
 [<ffffffff802a0e13>] flush_workqueue+0x59/0x81
 [<ffffffff802a0f79>] schedule_on_each_cpu+0xe6/0xfd
 [<ffffffff802e33ca>] filevec_add_drain_all+0x12/0x14
 [<ffffffff8030bb38>] remove_proc_entry+0xaf/0x25a
 [<ffffffff802c720d>] unregister_handler_proc+0x43/0x48
 [<ffffffff802c56c4>] free_irq+0xdd/0x117
 [<ffffffff88133101>] :e1000:e1000_free_irq+0x22/0x3b
 [<ffffffff88135c88>] :e1000:e1000_close+0x4d/0xb9
 [<ffffffff80429735>] dev_close+0x5b/0x7c
 [<ffffffff80429ab9>] dev_change_flags+0x64/0x139
 [<ffffffff8046048b>] devinet_ioctl+0x252/0x5e1
 [<ffffffff80460ac1>] inet_ioctl+0x71/0x8f
 [<ffffffff80422042>] sock_ioctl+0x1d7/0x1ff
 [<ffffffff802433b8>] do_ioctl+0x27/0x74
 [<ffffffff80231339>] vfs_ioctl+0x263/0x280
 [<ffffffff8024dfb7>] sys_ioctl+0x5f/0x82
 [<ffffffff8026042c>] tracesys+0x151/0x1c5
 [<0000003055ac6267>]   

Tim                      
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