• Ursula Braun's avatar
    qeth: avoid crash after detach of replugged device · f2148565
    Ursula Braun authored
    If a qeth device is plugged off, setting the device online stops in
    state HARDSETUP and a failure is reported to the base cio-layer
    causing halt/clear to be invoked. Replugging the device again triggers
    a qeth recovery without notification of the cio-layer. If a device
    is ungrouped in this state, the qeth set_offline function is not
    invoked, because the corresponding ccwgroup device is not in state
    ONLINE. Then incoming traffic is still handled by the qdio layer
    resulting in a crash in qeth_l<x>_qdio_input_handler, because (part
    of) the qeth data structures for this device are already removed.
    Solution: After replugging the device qeth recovery should lead to a
    working net device. Thus a "LAN offline" result when setting a qeth
    device online must not report a failure to the base cio-layer.
    Signed-off-by: default avatarUrsula Braun <ursula.braun@de.ibm.com>
    Signed-off-by: default avatarFrank Blaschka <frank.blaschka@de.ibm.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    f2148565
qeth_l2_main.c 32.7 KB