tree 4bef449ab25eb1d24a06ca72c4dbb4237de0e41f
parent 68c6b3d2c6e49671f6974c9c5ea31c5f190cc8a5
author Hendrik Brueckner <brueckner@linux.vnet.ibm.com> 1231499701 +0100
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1231499709 +0100

[S390] hvc_iucv: Special handling of IUCV HVC devices

This patch introduces special handling of the IUCV HVC console device.

If the first IUCV HVC terminal is used as (preferred) Linux console, and
needs some special handling for hangup.
The hvc_iucv_private structure contains a flag to indicate whether a IUCV
HVC device is used as a console.

A terminal acting as "console" behaves different if a tty hangup occurs:
If the iucv communication path is severed, a tty hangup is not
triggered (because the HVC layer does not notify its back-end in that case).
Instead, the console session is left unchanged and the IUCV HVC device is
reset to allow re-connects.
Note: Any output between the disconnect and a re-connect is discarded.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>