Bug#559577: atl1c: hangs when NIC link goes down

[Matei Conovici <cmatei@profis.ro>]

Subject: atl1c: hangs when NIC link goes down
Package: linux-2.6
Version: linux-2.6.32-rc8
Severity: important


After unplugging the ethernet cable, the system will hang in a matter of seconds.
It will also hang if I shutdown the interface, unplug the cable, then ifconfig eth0 up 
again.

The same problem occurs in vanilla 2.6.32 (reported the problem to atl1c maintainer).

This patch doesn't help. http://lkml.org/lkml/2009/11/6/12

System is an ASUS Eee PC 1005HA. The card is:

01:00.0 Ethernet controller: Attansic Technology Corp. Atheros AR8132 / L1c Gigabit Ethernet Adapter (rev c0)
[1969:1062]


I can't use a remote console right now, but what happens is:

INFO: task events/0:9 blocked for more than 120 seconds.

events/0 D ...
Call trace
	find_busiest_group
        schedule_timeout
        __switch_to
        wait_for_common
        default_wake_function
        __cancel_work_timer
        wq_barrier_func
        atl1c_down
        atl1c_reset_task
        worker_thread
        atl1c_reset_task
        autoremove_wake_function
        worker_thread
        kthread
        kthread
        kernel_thread_helper