linux/drivers/s390
Alexandra Winter 2fe8a23643 s390/qeth: Fix potential loss of L3-IP@ in case of network issues
Symptom:
In case of a bad cable connection (e.g. dirty optics) a fast sequence of
network DOWN-UP-DOWN-UP could happen. UP triggers recovery of the qeth
interface. In case of a second DOWN while recovery is still ongoing, it
can happen that the IP@ of a Layer3 qeth interface is lost and will not
be recovered by the second UP.

Problem:
When registration of IP addresses with Layer 3 qeth devices fails, (e.g.
because of bad address format) the respective IP address is deleted from
its hash-table in the driver. If registration fails because of a ENETDOWN
condition, the address should stay in the hashtable, so a subsequent
recovery can restore it.

3caa4af834 ("qeth: keep ip-address after LAN_OFFLINE failure")
fixes this for registration failures during normal operation, but not
during recovery.

Solution:
Keep L3-IP address in case of ENETDOWN in qeth_l3_recover_ip(). For
consistency with qeth_l3_add_ip() we also keep it in case of EADDRINUSE,
i.e. for some reason the card already/still has this address registered.

Fixes: 4a71df5004 ("qeth: new qeth device driver")
Cc: stable@vger.kernel.org
Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Link: https://lore.kernel.org/r/20240206085849.2902775-1-wintera@linux.ibm.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2024-02-08 12:10:09 +01:00
..
block Quite a lot of kexec work this time around. Many singleton patches in 2024-01-09 11:46:20 -08:00
char TTY/Serial changes for 6.8-rc1 2024-01-18 11:37:24 -08:00
cio s390 updates for 6.8 merge window 2024-01-10 18:18:20 -08:00
crypto s390/vfio-ap: do not reset queue removed from host config 2024-01-17 13:53:06 +01:00
net s390/qeth: Fix potential loss of L3-IP@ in case of network issues 2024-02-08 12:10:09 +01:00
scsi scsi: zfcp: Replace strlcpy() with strscpy() 2023-12-05 21:01:52 -05:00
virtio s390/airq: remove lsi_mask from airq_struct 2023-08-30 11:03:28 +02:00
Makefile