• Frank Pavlic's avatar
    [PATCH] s390: qeth driver fixes [3/6] · f7b65d70
    Frank Pavlic authored
    [PATCH 6/9] s390: qeth driver fixes [3/6]
    
    From: Frank Pavlic <fpavlic@de.ibm.com>
           	fixed kernel panic caused by qeth driver:
            Using a bonding device qeth driver will realloc
            headroom for every skb coming from the bond device.
            Once this happens qeth frees the original skb and
            set the skb pointer to the new realloced skb.
            Under heavy transmit workload (e.g.UDP streams) through bond
            network device the qdio output queue might get full.
            In this case we return with EBUSY from qeth_send_packet.
            Returning to qeth_hard_start_xmit routine
            the skb address on the stack still points to the old address,
            which has been freed before.
            Returning from qeth_hard_start_xmit with EBUSY results in
            requeuing the skb. In this case it corrupts the qdisc queue
            and results in kernel panic.
    Signed-off-by: default avatarFrank Pavlic <fpavlic@de.ibm.com>
    Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
    f7b65d70
qeth.h 29.4 KB