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qeth: avoid crash in case of layer mismatch for VSWITCH

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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>
This commit is contained in:
Ursula Braun
2009-01-04 17:35:18 -08:00
committed by David S. Miller
parent fe94e2e0a6
commit fc9c24603c
3 changed files with 14 additions and 6 deletions
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8
drivers/s390/net/qeth_l2_main.c
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@ -1126,9 +1126,11 @@ static int qeth_l2_recover(void *ptr)
dev_info(&card->gdev->dev,
"Device successfully recovered!\n");
else {
rtnl_lock();
dev_close(card->dev);
rtnl_unlock();
if (card->dev) {
rtnl_lock();
dev_close(card->dev);
rtnl_unlock();
}
dev_warn(&card->gdev->dev, "The qeth device driver "
"failed to recover an error on the device\n");
}