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authorUrsula Braun <ursula.braun@de.ibm.com>2009-01-04 17:35:18 -0800
committerDavid S. Miller <davem@davemloft.net>2009-01-04 17:35:18 -0800
commitfc9c24603c4b93d84160e14c0a98a754d4328d15 (patch)
treef90344411a906d8b9f06267c8dbc278c44588bdf /drivers/s390/net/qeth_l2_main.c
parentfe94e2e0a63a49d23753f56eacb446c4f73c1dea (diff)
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>
Diffstat (limited to 'drivers/s390/net/qeth_l2_main.c')
-rw-r--r--drivers/s390/net/qeth_l2_main.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index 2c48591ced4..21627ba3093 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -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");
}