From fc9c24603c4b93d84160e14c0a98a754d4328d15 Mon Sep 17 00:00:00 2001 From: Ursula Braun Date: Sun, 4 Jan 2009 17:35:18 -0800 Subject: 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 Signed-off-by: Frank Blaschka Signed-off-by: David S. Miller --- drivers/s390/net/qeth_l2_main.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'drivers/s390/net/qeth_l2_main.c') diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c index 2c48591ced44..21627ba3093b 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"); } -- cgit v1.2.3-70-g09d2