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tty: remove broken r3964 line discipline

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Noone stepped up in the past two years since it was marked as BROKEN by
commit c7084edc3f (tty: mark Siemens R3964 line discipline as BROKEN).
Remove the line discipline for good.

Three remarks:
* we remove also the uapi header (as noone is able to use that interface
  anyway)
* we do *not* remove the N_R3964 constant definition from tty.h, so it
  remains reserved.
* in_interrupt() check is now removed from vt's con_put_char. Noone else
  calls tty_operations::put_char from interrupt context.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210505091928.22010-2-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby
2021-05-05 11:18:54 +02:00
committed by Greg Kroah-Hartman
parent d7e325aaa8
commit ed5aecd3da
7 changed files with 0 additions and 1574 deletions
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99
include/uapi/linux/n_r3964.h
View File

@@ -1,99 +0,0 @@
/* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */
/* r3964 linediscipline for linux
*
* -----------------------------------------------------------
* Copyright by
* Philips Automation Projects
* Kassel (Germany)
* -----------------------------------------------------------
* This software may be used and distributed according to the terms of
* the GNU General Public License, incorporated herein by reference.
*
* Author:
* L. Haag
*
* $Log: r3964.h,v $
* Revision 1.4 2005/12/21 19:54:24 Kurt Huwig <kurt huwig de>
* Fixed HZ usage on 2.6 kernels
* Removed unnecessary include
*
* Revision 1.3 2001/03/18 13:02:24 dwmw2
* Fix timer usage, use spinlocks properly.
*
* Revision 1.2 2001/03/18 12:53:15 dwmw2
* Merge changes in 2.4.2
*
* Revision 1.1.1.1 1998/10/13 16:43:14 dwmw2
* This'll screw the version control
*
* Revision 1.6 1998/09/30 00:40:38 dwmw2
* Updated to use kernel's N_R3964 if available
*
* Revision 1.4 1998/04/02 20:29:44 lhaag
* select, blocking, ...
*
* Revision 1.3 1998/02/12 18:58:43 root
* fixed some memory leaks
* calculation of checksum characters
*
* Revision 1.2 1998/02/07 13:03:17 root
* ioctl read_telegram
*
* Revision 1.1 1998/02/06 19:19:43 root
* Initial revision
*
*
*/
#ifndef _UAPI__LINUX_N_R3964_H__
#define _UAPI__LINUX_N_R3964_H__
/* line disciplines for r3964 protocol */
/*
* Ioctl-commands
*/
#define R3964_ENABLE_SIGNALS 0x5301
#define R3964_SETPRIORITY 0x5302
#define R3964_USE_BCC 0x5303
#define R3964_READ_TELEGRAM 0x5304
/* Options for R3964_SETPRIORITY */
#define R3964_MASTER 0
#define R3964_SLAVE 1
/* Options for R3964_ENABLE_SIGNALS */
#define R3964_SIG_ACK 0x0001
#define R3964_SIG_DATA 0x0002
#define R3964_SIG_ALL 0x000f
#define R3964_SIG_NONE 0x0000
#define R3964_USE_SIGIO 0x1000
/*
* r3964 operation states:
*/
/* types for msg_id: */
enum {R3964_MSG_ACK=1, R3964_MSG_DATA };
#define R3964_MAX_MSG_COUNT 32
/* error codes for client messages */
#define R3964_OK 0 /* no error. */
#define R3964_TX_FAIL -1 /* transmission error, block NOT sent */
#define R3964_OVERFLOW -2 /* msg queue overflow */
/* the client gets this struct when calling read(fd,...): */
struct r3964_client_message {
int msg_id;
int arg;
int error_code;
};
#define R3964_MTU 256
#endif /* _UAPI__LINUX_N_R3964_H__ */