tree 96f385ae7c987248ac90a01cc323c1c72e2f47c1
parent c12da96f801a3f45b0634c966b9e7cda307daa72
author Peter Hurley <peter@hurleysoftware.com> 1452494465 -0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1453935704 -0800

tty: Refactor tty_ldisc_reinit() for reuse

At tty hangup, the line discipline instance is reinitialized by
closing the current ldisc instance and opening a new instance.
This operation is complicated by error recovery: if the attempt
to reinit the current line discipline fails, the line discipline
is reset to N_TTY (which should not but can fail).

Re-purpose tty_ldisc_reinit() to return a valid, open line discipline
instance, or otherwise, an error.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>