qeth: avoid crash in case of layer mismatch for VSWITCH
For z/VM GuestLAN or VSWITCH devices the transport layer is configured in z/VM. The layer2 attribute of a participating Linux device has to match the z/VM definition. In case of a mismatch Linux currently crashes in qeth recovery due to a reference to the not yet existing net_device. Solution: add a check for existence of net_device and add a message pointing to the mismatch of layer definitions in Linux and z/VM. Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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