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https://github.com/torvalds/linux
synced 2024-09-20 11:07:02 +00:00
tty: remove broken r3964 line discipline
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
Greg Kroah-Hartman
parent
d7e325aaa8
commit
ed5aecd3da
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@ -621,7 +621,6 @@ CONFIG_HW_RANDOM=y
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CONFIG_HW_RANDOM_VIRTIO=m
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CONFIG_NVRAM=y
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CONFIG_DTLK=m
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CONFIG_R3964=m
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CONFIG_CARDMAN_4000=m
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CONFIG_CARDMAN_4040=m
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CONFIG_IPWIRELESS=m
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@ -218,19 +218,6 @@ config XILINX_HWICAP
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If unsure, say N.
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config R3964
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tristate "Siemens R3964 line discipline"
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depends on TTY && BROKEN
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help
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This driver allows synchronous communication with devices using the
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Siemens R3964 packet protocol. Unless you are dealing with special
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hardware like PLCs, you are unlikely to need this.
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To compile this driver as a module, choose M here: the
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module will be called n_r3964.
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If unsure, say N.
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config APPLICOM
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tristate "Applicom intelligent fieldbus card support"
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depends on PCI
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@ -9,7 +9,6 @@ obj-$(CONFIG_AUDIT) += tty_audit.o
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obj-$(CONFIG_MAGIC_SYSRQ) += sysrq.o
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obj-$(CONFIG_N_HDLC) += n_hdlc.o
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obj-$(CONFIG_N_GSM) += n_gsm.o
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obj-$(CONFIG_R3964) += n_r3964.o
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obj-y += vt/
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obj-$(CONFIG_HVC_DRIVER) += hvc/
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File diff suppressed because it is too large
Load diff
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@ -3260,8 +3260,6 @@ static int con_write(struct tty_struct *tty, const unsigned char *buf, int count
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static int con_put_char(struct tty_struct *tty, unsigned char ch)
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{
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if (in_interrupt())
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return 0; /* n_r3964 calls put_char() from interrupt context */
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return do_con_write(tty, &ch, 1);
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}
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@ -1,175 +0,0 @@
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/* r3964 linediscipline for linux
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*
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* -----------------------------------------------------------
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* Copyright by
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* Philips Automation Projects
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* Kassel (Germany)
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* -----------------------------------------------------------
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* This software may be used and distributed according to the terms of
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* the GNU General Public License, incorporated herein by reference.
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*
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* Author:
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* L. Haag
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*
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* $Log: r3964.h,v $
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* Revision 1.4 2005/12/21 19:54:24 Kurt Huwig <kurt huwig de>
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* Fixed HZ usage on 2.6 kernels
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* Removed unnecessary include
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*
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* Revision 1.3 2001/03/18 13:02:24 dwmw2
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* Fix timer usage, use spinlocks properly.
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*
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* Revision 1.2 2001/03/18 12:53:15 dwmw2
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* Merge changes in 2.4.2
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*
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* Revision 1.1.1.1 1998/10/13 16:43:14 dwmw2
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* This'll screw the version control
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*
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* Revision 1.6 1998/09/30 00:40:38 dwmw2
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* Updated to use kernel's N_R3964 if available
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*
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* Revision 1.4 1998/04/02 20:29:44 lhaag
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* select, blocking, ...
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*
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* Revision 1.3 1998/02/12 18:58:43 root
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* fixed some memory leaks
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* calculation of checksum characters
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*
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* Revision 1.2 1998/02/07 13:03:17 root
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* ioctl read_telegram
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*
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* Revision 1.1 1998/02/06 19:19:43 root
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* Initial revision
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*
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*
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*/
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#ifndef __LINUX_N_R3964_H__
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#define __LINUX_N_R3964_H__
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#include <linux/param.h>
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#include <uapi/linux/n_r3964.h>
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/*
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* Common ascii handshake characters:
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*/
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#define STX 0x02
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#define ETX 0x03
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#define DLE 0x10
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#define NAK 0x15
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/*
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* Timeouts (from milliseconds to jiffies)
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*/
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#define R3964_TO_QVZ ((550)*HZ/1000)
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#define R3964_TO_ZVZ ((220)*HZ/1000)
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#define R3964_TO_NO_BUF ((400)*HZ/1000)
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#define R3964_NO_TX_ROOM ((100)*HZ/1000)
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#define R3964_TO_RX_PANIC ((4000)*HZ/1000)
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#define R3964_MAX_RETRIES 5
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enum { R3964_IDLE,
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R3964_TX_REQUEST, R3964_TRANSMITTING,
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R3964_WAIT_ZVZ_BEFORE_TX_RETRY, R3964_WAIT_FOR_TX_ACK,
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R3964_WAIT_FOR_RX_BUF,
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R3964_RECEIVING, R3964_WAIT_FOR_BCC, R3964_WAIT_FOR_RX_REPEAT
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};
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/*
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* All open file-handles are 'clients' and are stored in a linked list:
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*/
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struct r3964_message;
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struct r3964_client_info {
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spinlock_t lock;
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struct pid *pid;
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unsigned int sig_flags;
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struct r3964_client_info *next;
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struct r3964_message *first_msg;
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struct r3964_message *last_msg;
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struct r3964_block_header *next_block_to_read;
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int msg_count;
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};
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struct r3964_block_header;
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/* internal version of client_message: */
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struct r3964_message {
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int msg_id;
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int arg;
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int error_code;
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struct r3964_block_header *block;
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struct r3964_message *next;
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};
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/*
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* Header of received block in rx_buf/tx_buf:
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*/
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struct r3964_block_header
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{
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unsigned int length; /* length in chars without header */
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unsigned char *data; /* usually data is located
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immediately behind this struct */
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unsigned int locks; /* only used in rx_buffer */
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struct r3964_block_header *next;
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struct r3964_client_info *owner; /* =NULL in rx_buffer */
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};
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/*
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* If rx_buf hasn't enough space to store R3964_MTU chars,
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* we will reject all incoming STX-requests by sending NAK.
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*/
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#define RX_BUF_SIZE 4000
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#define TX_BUF_SIZE 4000
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#define R3964_MAX_BLOCKS_IN_RX_QUEUE 100
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#define R3964_PARITY 0x0001
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#define R3964_FRAME 0x0002
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#define R3964_OVERRUN 0x0004
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#define R3964_UNKNOWN 0x0008
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#define R3964_BREAK 0x0010
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#define R3964_CHECKSUM 0x0020
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#define R3964_ERROR 0x003f
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#define R3964_BCC 0x4000
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#define R3964_DEBUG 0x8000
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struct r3964_info {
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spinlock_t lock;
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struct tty_struct *tty;
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unsigned char priority;
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unsigned char *rx_buf; /* ring buffer */
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unsigned char *tx_buf;
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struct r3964_block_header *rx_first;
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struct r3964_block_header *rx_last;
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struct r3964_block_header *tx_first;
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struct r3964_block_header *tx_last;
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unsigned int tx_position;
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unsigned int rx_position;
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unsigned char last_rx;
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unsigned char bcc;
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unsigned int blocks_in_rx_queue;
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struct mutex read_lock; /* serialize r3964_read */
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struct r3964_client_info *firstClient;
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unsigned int state;
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unsigned int flags;
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struct timer_list tmr;
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int nRetry;
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};
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#endif
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@ -1,99 +0,0 @@
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/* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */
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/* r3964 linediscipline for linux
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*
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* -----------------------------------------------------------
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* Copyright by
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* Philips Automation Projects
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* Kassel (Germany)
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* -----------------------------------------------------------
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* This software may be used and distributed according to the terms of
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* the GNU General Public License, incorporated herein by reference.
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*
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* Author:
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* L. Haag
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*
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* $Log: r3964.h,v $
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* Revision 1.4 2005/12/21 19:54:24 Kurt Huwig <kurt huwig de>
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* Fixed HZ usage on 2.6 kernels
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* Removed unnecessary include
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*
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* Revision 1.3 2001/03/18 13:02:24 dwmw2
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* Fix timer usage, use spinlocks properly.
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*
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* Revision 1.2 2001/03/18 12:53:15 dwmw2
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* Merge changes in 2.4.2
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*
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* Revision 1.1.1.1 1998/10/13 16:43:14 dwmw2
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* This'll screw the version control
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*
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* Revision 1.6 1998/09/30 00:40:38 dwmw2
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* Updated to use kernel's N_R3964 if available
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*
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* Revision 1.4 1998/04/02 20:29:44 lhaag
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* select, blocking, ...
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*
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* Revision 1.3 1998/02/12 18:58:43 root
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* fixed some memory leaks
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* calculation of checksum characters
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*
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* Revision 1.2 1998/02/07 13:03:17 root
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* ioctl read_telegram
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*
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* Revision 1.1 1998/02/06 19:19:43 root
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* Initial revision
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*
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*
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*/
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#ifndef _UAPI__LINUX_N_R3964_H__
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#define _UAPI__LINUX_N_R3964_H__
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/* line disciplines for r3964 protocol */
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/*
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* Ioctl-commands
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*/
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#define R3964_ENABLE_SIGNALS 0x5301
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#define R3964_SETPRIORITY 0x5302
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#define R3964_USE_BCC 0x5303
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#define R3964_READ_TELEGRAM 0x5304
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/* Options for R3964_SETPRIORITY */
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#define R3964_MASTER 0
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#define R3964_SLAVE 1
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/* Options for R3964_ENABLE_SIGNALS */
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#define R3964_SIG_ACK 0x0001
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#define R3964_SIG_DATA 0x0002
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#define R3964_SIG_ALL 0x000f
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#define R3964_SIG_NONE 0x0000
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#define R3964_USE_SIGIO 0x1000
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/*
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* r3964 operation states:
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*/
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/* types for msg_id: */
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enum {R3964_MSG_ACK=1, R3964_MSG_DATA };
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#define R3964_MAX_MSG_COUNT 32
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/* error codes for client messages */
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#define R3964_OK 0 /* no error. */
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#define R3964_TX_FAIL -1 /* transmission error, block NOT sent */
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#define R3964_OVERFLOW -2 /* msg queue overflow */
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/* the client gets this struct when calling read(fd,...): */
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struct r3964_client_message {
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int msg_id;
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int arg;
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int error_code;
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};
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#define R3964_MTU 256
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#endif /* _UAPI__LINUX_N_R3964_H__ */
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