ctc: removal of the old ctc driver

ctc driver is replaced by a new ctcm driver.
The ctcm driver supports the channel-to-channel connections of the
old ctc driver plus an additional MPC protocol to provide SNA
connectivity.
This patch removes the functions of the old ctc driver.

Signed-off-by: Peter Tiedemann <[e-mail]>
Signed-off-by: Ursula Braun <[e-mail]>
Signed-off-by: Jeff Garzik <[e-mail]>

drivers/s390/net/ctcdbug.c

···
-/*
- *
- * linux/drivers/s390/net/ctcdbug.c
- *
- * CTC / ESCON network driver - s390 dbf exploit.
- *
- * Copyright 2000,2003 IBM Corporation
- *
- *    Author(s): Original Code written by
- *			  Peter Tiedemann ([e-mail])
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#include "ctcdbug.h"
-
-/**
- * Debug Facility Stuff
- */
-debug_info_t *ctc_dbf_setup = NULL;
-debug_info_t *ctc_dbf_data = NULL;
-debug_info_t *ctc_dbf_trace = NULL;
-
-DEFINE_PER_CPU(char[256], ctc_dbf_txt_buf);
-
-void
-ctc_unregister_dbf_views(void)
-{
-	if (ctc_dbf_setup)
-		debug_unregister(ctc_dbf_setup);
-	if (ctc_dbf_data)
-		debug_unregister(ctc_dbf_data);
-	if (ctc_dbf_trace)
-		debug_unregister(ctc_dbf_trace);
-}
-int
-ctc_register_dbf_views(void)
-{
-	ctc_dbf_setup = debug_register(CTC_DBF_SETUP_NAME,
-					CTC_DBF_SETUP_PAGES,
-					CTC_DBF_SETUP_NR_AREAS,
-					CTC_DBF_SETUP_LEN);
-	ctc_dbf_data = debug_register(CTC_DBF_DATA_NAME,
-				       CTC_DBF_DATA_PAGES,
-				       CTC_DBF_DATA_NR_AREAS,
-				       CTC_DBF_DATA_LEN);
-	ctc_dbf_trace = debug_register(CTC_DBF_TRACE_NAME,
-					CTC_DBF_TRACE_PAGES,
-					CTC_DBF_TRACE_NR_AREAS,
-					CTC_DBF_TRACE_LEN);
-
-	if ((ctc_dbf_setup == NULL) || (ctc_dbf_data == NULL) ||
-	    (ctc_dbf_trace == NULL)) {
-		ctc_unregister_dbf_views();
-		return -ENOMEM;
-	}
-	debug_register_view(ctc_dbf_setup, &debug_hex_ascii_view);
-	debug_set_level(ctc_dbf_setup, CTC_DBF_SETUP_LEVEL);
-
-	debug_register_view(ctc_dbf_data, &debug_hex_ascii_view);
-	debug_set_level(ctc_dbf_data, CTC_DBF_DATA_LEVEL);
-
-	debug_register_view(ctc_dbf_trace, &debug_hex_ascii_view);
-	debug_set_level(ctc_dbf_trace, CTC_DBF_TRACE_LEVEL);
-
-	return 0;
-}
-

drivers/s390/net/ctcdbug.h

···
-/*
- *
- * linux/drivers/s390/net/ctcdbug.h
- *
- * CTC / ESCON network driver - s390 dbf exploit.
- *
- * Copyright 2000,2003 IBM Corporation
- *
- *    Author(s): Original Code written by
- *			  Peter Tiedemann ([e-mail])
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-#ifndef _CTCDBUG_H_
-#define _CTCDBUG_H_
-
-#include <asm/debug.h>
-#include "ctcmain.h"
-/**
- * Debug Facility stuff
- */
-#define CTC_DBF_SETUP_NAME "ctc_setup"
-#define CTC_DBF_SETUP_LEN 16
-#define CTC_DBF_SETUP_PAGES 8
-#define CTC_DBF_SETUP_NR_AREAS 1
-#define CTC_DBF_SETUP_LEVEL 3
-
-#define CTC_DBF_DATA_NAME "ctc_data"
-#define CTC_DBF_DATA_LEN 128
-#define CTC_DBF_DATA_PAGES 8
-#define CTC_DBF_DATA_NR_AREAS 1
-#define CTC_DBF_DATA_LEVEL 3
-
-#define CTC_DBF_TRACE_NAME "ctc_trace"
-#define CTC_DBF_TRACE_LEN 16
-#define CTC_DBF_TRACE_PAGES 4
-#define CTC_DBF_TRACE_NR_AREAS 2
-#define CTC_DBF_TRACE_LEVEL 3
-
-#define DBF_TEXT(name,level,text) \
-	do { \
-		debug_text_event(ctc_dbf_##name,level,text); \
-	} while (0)
-
-#define DBF_HEX(name,level,addr,len) \
-	do { \
-		debug_event(ctc_dbf_##name,level,(void*)(addr),len); \
-	} while (0)
-
-DECLARE_PER_CPU(char[256], ctc_dbf_txt_buf);
-extern debug_info_t *ctc_dbf_setup;
-extern debug_info_t *ctc_dbf_data;
-extern debug_info_t *ctc_dbf_trace;
-
-
-#define DBF_TEXT_(name,level,text...)				\
-	do {								\
-		char* ctc_dbf_txt_buf = get_cpu_var(ctc_dbf_txt_buf);	\
-		sprintf(ctc_dbf_txt_buf, text);			  	\
-		debug_text_event(ctc_dbf_##name,level,ctc_dbf_txt_buf);	\
-		put_cpu_var(ctc_dbf_txt_buf);				\
-	} while (0)
-
-#define DBF_SPRINTF(name,level,text...) \
-	do { \
-		debug_sprintf_event(ctc_dbf_trace, level, ##text ); \
-		debug_sprintf_event(ctc_dbf_trace, level, text ); \
-	} while (0)
-
-
-int ctc_register_dbf_views(void);
-
-void ctc_unregister_dbf_views(void);
-
-/**
- * some more debug stuff
- */
-
-#define HEXDUMP16(importance,header,ptr) \
-PRINT_##importance(header "%02x %02x %02x %02x  %02x %02x %02x %02x  " \
-		   "%02x %02x %02x %02x  %02x %02x %02x %02x\n", \
-		   *(((char*)ptr)),*(((char*)ptr)+1),*(((char*)ptr)+2), \
-		   *(((char*)ptr)+3),*(((char*)ptr)+4),*(((char*)ptr)+5), \
-		   *(((char*)ptr)+6),*(((char*)ptr)+7),*(((char*)ptr)+8), \
-		   *(((char*)ptr)+9),*(((char*)ptr)+10),*(((char*)ptr)+11), \
-		   *(((char*)ptr)+12),*(((char*)ptr)+13), \
-		   *(((char*)ptr)+14),*(((char*)ptr)+15)); \
-PRINT_##importance(header "%02x %02x %02x %02x  %02x %02x %02x %02x  " \
-		   "%02x %02x %02x %02x  %02x %02x %02x %02x\n", \
-		   *(((char*)ptr)+16),*(((char*)ptr)+17), \
-		   *(((char*)ptr)+18),*(((char*)ptr)+19), \
-		   *(((char*)ptr)+20),*(((char*)ptr)+21), \
-		   *(((char*)ptr)+22),*(((char*)ptr)+23), \
-		   *(((char*)ptr)+24),*(((char*)ptr)+25), \
-		   *(((char*)ptr)+26),*(((char*)ptr)+27), \
-		   *(((char*)ptr)+28),*(((char*)ptr)+29), \
-		   *(((char*)ptr)+30),*(((char*)ptr)+31));
-
-static inline void
-hex_dump(unsigned char *buf, size_t len)
-{
-	size_t i;
-
-	for (i = 0; i < len; i++) {
-		if (i && !(i % 16))
-			printk("\n");
-		printk("%02x ", *(buf + i));
-	}
-	printk("\n");
-}
-
-
-#endif

drivers/s390/net/ctcmain.c

···
-/*
- * CTC / ESCON network driver
- *
- * Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
- * Author(s): Fritz Elfert ([e-mail], [e-mail])
- * Fixes by : Jochen Röhrig ([e-mail])
- *            Arnaldo Carvalho de Melo <[e-mail]>
-	      Peter Tiedemann ([e-mail])
- * Driver Model stuff by : Cornelia Huck <[e-mail]>
- *
- * Documentation used:
- *  - Principles of Operation (IBM doc#: SA22-7201-06)
- *  - Common IO/-Device Commands and Self Description (IBM doc#: SA22-7204-02)
- *  - Common IO/-Device Commands and Self Description (IBM doc#: SN22-5535)
- *  - ESCON Channel-to-Channel Adapter (IBM doc#: SA22-7203-00)
- *  - ESCON I/O Interface (IBM doc#: SA22-7202-029
- *
- * and the source of the original CTC driver by:
- *  Dieter Wellerdiek ([e-mail])
- *  Martin Schwidefsky ([e-mail])
- *  Denis Joseph Barrow ([e-mail],[e-mail])
- *  Jochen Röhrig ([e-mail])
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- */
-#undef DEBUG
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/errno.h>
-#include <linux/types.h>
-#include <linux/interrupt.h>
-#include <linux/timer.h>
-#include <linux/bitops.h>
-
-#include <linux/signal.h>
-#include <linux/string.h>
-
-#include <linux/ip.h>
-#include <linux/if_arp.h>
-#include <linux/tcp.h>
-#include <linux/skbuff.h>
-#include <linux/ctype.h>
-#include <net/dst.h>
-
-#include <asm/io.h>
-#include <asm/ccwdev.h>
-#include <asm/ccwgroup.h>
-#include <asm/uaccess.h>
-
-#include <asm/idals.h>
-
-#include "fsm.h"
-#include "cu3088.h"
-
-#include "ctcdbug.h"
-#include "ctcmain.h"
-
-MODULE_AUTHOR("(C) 2000 IBM Corp. by Fritz Elfert ([e-mail])");
-MODULE_DESCRIPTION("Linux for S/390 CTC/Escon Driver");
-MODULE_LICENSE("GPL");
-/**
- * States of the interface statemachine.
- */
-enum dev_states {
-	DEV_STATE_STOPPED,
-	DEV_STATE_STARTWAIT_RXTX,
-	DEV_STATE_STARTWAIT_RX,
-	DEV_STATE_STARTWAIT_TX,
-	DEV_STATE_STOPWAIT_RXTX,
-	DEV_STATE_STOPWAIT_RX,
-	DEV_STATE_STOPWAIT_TX,
-	DEV_STATE_RUNNING,
-	/**
-	 * MUST be always the last element!!
-	 */
-	CTC_NR_DEV_STATES
-};
-
-static const char *dev_state_names[] = {
-	"Stopped",
-	"StartWait RXTX",
-	"StartWait RX",
-	"StartWait TX",
-	"StopWait RXTX",
-	"StopWait RX",
-	"StopWait TX",
-	"Running",
-};
-
-/**
- * Events of the interface statemachine.
- */
-enum dev_events {
-	DEV_EVENT_START,
-	DEV_EVENT_STOP,
-	DEV_EVENT_RXUP,
-	DEV_EVENT_TXUP,
-	DEV_EVENT_RXDOWN,
-	DEV_EVENT_TXDOWN,
-	DEV_EVENT_RESTART,
-	/**
-	 * MUST be always the last element!!
-	 */
-	CTC_NR_DEV_EVENTS
-};
-
-static const char *dev_event_names[] = {
-	"Start",
-	"Stop",
-	"RX up",
-	"TX up",
-	"RX down",
-	"TX down",
-	"Restart",
-};
-
-/**
- * Events of the channel statemachine
- */
-enum ch_events {
-	/**
-	 * Events, representing return code of
-	 * I/O operations (ccw_device_start, ccw_device_halt et al.)
-	 */
-	CH_EVENT_IO_SUCCESS,
-	CH_EVENT_IO_EBUSY,
-	CH_EVENT_IO_ENODEV,
-	CH_EVENT_IO_EIO,
-	CH_EVENT_IO_UNKNOWN,
-
-	CH_EVENT_ATTNBUSY,
-	CH_EVENT_ATTN,
-	CH_EVENT_BUSY,
-
-	/**
-	 * Events, representing unit-check
-	 */
-	CH_EVENT_UC_RCRESET,
-	CH_EVENT_UC_RSRESET,
-	CH_EVENT_UC_TXTIMEOUT,
-	CH_EVENT_UC_TXPARITY,
-	CH_EVENT_UC_HWFAIL,
-	CH_EVENT_UC_RXPARITY,
-	CH_EVENT_UC_ZERO,
-	CH_EVENT_UC_UNKNOWN,
-
-	/**
-	 * Events, representing subchannel-check
-	 */
-	CH_EVENT_SC_UNKNOWN,
-
-	/**
-	 * Events, representing machine checks
-	 */
-	CH_EVENT_MC_FAIL,
-	CH_EVENT_MC_GOOD,
-
-	/**
-	 * Event, representing normal IRQ
-	 */
-	CH_EVENT_IRQ,
-	CH_EVENT_FINSTAT,
-
-	/**
-	 * Event, representing timer expiry.
-	 */
-	CH_EVENT_TIMER,
-
-	/**
-	 * Events, representing commands from upper levels.
-	 */
-	CH_EVENT_START,
-	CH_EVENT_STOP,
-
-	/**
-	 * MUST be always the last element!!
-	 */
-	NR_CH_EVENTS,
-};
-
-/**
- * States of the channel statemachine.
- */
-enum ch_states {
-	/**
-	 * Channel not assigned to any device,
-	 * initial state, direction invalid
-	 */
-	CH_STATE_IDLE,
-
-	/**
-	 * Channel assigned but not operating
-	 */
-	CH_STATE_STOPPED,
-	CH_STATE_STARTWAIT,
-	CH_STATE_STARTRETRY,
-	CH_STATE_SETUPWAIT,
-	CH_STATE_RXINIT,
-	CH_STATE_TXINIT,
-	CH_STATE_RX,
-	CH_STATE_TX,
-	CH_STATE_RXIDLE,
-	CH_STATE_TXIDLE,
-	CH_STATE_RXERR,
-	CH_STATE_TXERR,
-	CH_STATE_TERM,
-	CH_STATE_DTERM,
-	CH_STATE_NOTOP,
-
-	/**
-	 * MUST be always the last element!!
-	 */
-	NR_CH_STATES,
-};
-
-static int loglevel = CTC_LOGLEVEL_DEFAULT;
-
-/**
- * Linked list of all detected channels.
- */
-static struct channel *channels = NULL;
-
-/**
- * Print Banner.
- */
-static void
-print_banner(void)
-{
-	static int printed = 0;
-
-	if (printed)
-		return;
-
-	printk(KERN_INFO "CTC driver initialized\n");
-	printed = 1;
-}
-
-/**
- * Return type of a detected device.
- */
-static enum channel_types
-get_channel_type(struct ccw_device_id *id)
-{
-	enum channel_types type = (enum channel_types) id->driver_info;
-
-	if (type == channel_type_ficon)
-		type = channel_type_escon;
-
-	return type;
-}
-
-static const char *ch_event_names[] = {
-	"ccw_device success",
-	"ccw_device busy",
-	"ccw_device enodev",
-	"ccw_device ioerr",
-	"ccw_device unknown",
-
-	"Status ATTN & BUSY",
-	"Status ATTN",
-	"Status BUSY",
-
-	"Unit check remote reset",
-	"Unit check remote system reset",
-	"Unit check TX timeout",
-	"Unit check TX parity",
-	"Unit check Hardware failure",
-	"Unit check RX parity",
-	"Unit check ZERO",
-	"Unit check Unknown",
-
-	"SubChannel check Unknown",
-
-	"Machine check failure",
-	"Machine check operational",
-
-	"IRQ normal",
-	"IRQ final",
-
-	"Timer",
-
-	"Start",
-	"Stop",
-};
-
-static const char *ch_state_names[] = {
-	"Idle",
-	"Stopped",
-	"StartWait",
-	"StartRetry",
-	"SetupWait",
-	"RX init",
-	"TX init",
-	"RX",
-	"TX",
-	"RX idle",
-	"TX idle",
-	"RX error",
-	"TX error",
-	"Terminating",
-	"Restarting",
-	"Not operational",
-};
-
-#ifdef DEBUG
-/**
- * Dump header and first 16 bytes of an sk_buff for debugging purposes.
- *
- * @param skb    The sk_buff to dump.
- * @param offset Offset relative to skb-data, where to start the dump.
- */
-static void
-ctc_dump_skb(struct sk_buff *skb, int offset)
-{
-	unsigned char *p = skb->data;
-	__u16 bl;
-	struct ll_header *header;
-	int i;
-
-	if (!(loglevel & CTC_LOGLEVEL_DEBUG))
-		return;
-	p += offset;
-	bl = *((__u16 *) p);
-	p += 2;
-	header = (struct ll_header *) p;
-	p -= 2;
-
-	printk(KERN_DEBUG "dump:\n");
-	printk(KERN_DEBUG "blocklen=%d %04x\n", bl, bl);
-
-	printk(KERN_DEBUG "h->length=%d %04x\n", header->length,
-	       header->length);
-	printk(KERN_DEBUG "h->type=%04x\n", header->type);
-	printk(KERN_DEBUG "h->unused=%04x\n", header->unused);
-	if (bl > 16)
-		bl = 16;
-	printk(KERN_DEBUG "data: ");
-	for (i = 0; i < bl; i++)
-		printk("%02x%s", *p++, (i % 16) ? " " : "\n<7>");
-	printk("\n");
-}
-#else
-static inline void
-ctc_dump_skb(struct sk_buff *skb, int offset)
-{
-}
-#endif
-
-/**
- * Unpack a just received skb and hand it over to
- * upper layers.
- *
- * @param ch The channel where this skb has been received.
- * @param pskb The received skb.
- */
-static void
-ctc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
-{
-	struct net_device *dev = ch->netdev;
-	struct ctc_priv *privptr = (struct ctc_priv *) dev->priv;
-	__u16 len = *((__u16 *) pskb->data);
-
-	DBF_TEXT(trace, 4, __FUNCTION__);
-	skb_put(pskb, 2 + LL_HEADER_LENGTH);
-	skb_pull(pskb, 2);
-	pskb->dev = dev;
-	pskb->ip_summed = CHECKSUM_UNNECESSARY;
-	while (len > 0) {
-		struct sk_buff *skb;
-		struct ll_header *header = (struct ll_header *) pskb->data;
-
-		skb_pull(pskb, LL_HEADER_LENGTH);
-		if ((ch->protocol == CTC_PROTO_S390) &&
-		    (header->type != ETH_P_IP)) {
-
-#ifndef DEBUG
-		        if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
-#endif
-				/**
-				 * Check packet type only if we stick strictly
-				 * to S/390's protocol of OS390. This only
-				 * supports IP. Otherwise allow any packet
-				 * type.
-				 */
-				ctc_pr_warn(
-					"%s Illegal packet type 0x%04x received, dropping\n",
-					dev->name, header->type);
-				ch->logflags |= LOG_FLAG_ILLEGALPKT;
-#ifndef DEBUG
-			}
-#endif
-#ifdef DEBUG
-			ctc_dump_skb(pskb, -6);
-#endif
-			privptr->stats.rx_dropped++;
-			privptr->stats.rx_frame_errors++;
-			return;
-		}
-		pskb->protocol = ntohs(header->type);
-		if (header->length <= LL_HEADER_LENGTH) {
-#ifndef DEBUG
-		        if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
-#endif
-				ctc_pr_warn(
-				       "%s Illegal packet size %d "
-				       "received (MTU=%d blocklen=%d), "
-				       "dropping\n", dev->name, header->length,
-				       dev->mtu, len);
-				ch->logflags |= LOG_FLAG_ILLEGALSIZE;
-#ifndef DEBUG
-			}
-#endif
-#ifdef DEBUG
-			ctc_dump_skb(pskb, -6);
-#endif
-			privptr->stats.rx_dropped++;
-			privptr->stats.rx_length_errors++;
-			return;
-		}
-		header->length -= LL_HEADER_LENGTH;
-		len -= LL_HEADER_LENGTH;
-		if ((header->length > skb_tailroom(pskb)) ||
-		    (header->length > len)) {
-#ifndef DEBUG
-		        if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
-#endif
-				ctc_pr_warn(
-					"%s Illegal packet size %d "
-					"(beyond the end of received data), "
-					"dropping\n", dev->name, header->length);
-				ch->logflags |= LOG_FLAG_OVERRUN;
-#ifndef DEBUG
-			}
-#endif
-#ifdef DEBUG
-			ctc_dump_skb(pskb, -6);
-#endif
-			privptr->stats.rx_dropped++;
-			privptr->stats.rx_length_errors++;
-			return;
-		}
-		skb_put(pskb, header->length);
-		skb_reset_mac_header(pskb);
-		len -= header->length;
-		skb = dev_alloc_skb(pskb->len);
-		if (!skb) {
-#ifndef DEBUG
-		        if (!(ch->logflags & LOG_FLAG_NOMEM)) {
-#endif
-				ctc_pr_warn(
-					"%s Out of memory in ctc_unpack_skb\n",
-					dev->name);
-				ch->logflags |= LOG_FLAG_NOMEM;
-#ifndef DEBUG
-			}
-#endif
-			privptr->stats.rx_dropped++;
-			return;
-		}
-		skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
-					  pskb->len);
-		skb_reset_mac_header(skb);
-		skb->dev = pskb->dev;
-		skb->protocol = pskb->protocol;
-		pskb->ip_summed = CHECKSUM_UNNECESSARY;
-		/**
-		 * reset logflags
-		 */
-		ch->logflags = 0;
-		privptr->stats.rx_packets++;
-		privptr->stats.rx_bytes += skb->len;
-		netif_rx_ni(skb);
-		dev->last_rx = jiffies;
-		if (len > 0) {
-			skb_pull(pskb, header->length);
-			if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
-#ifndef DEBUG
-				if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
-#endif
-					ctc_pr_warn(
-						"%s Overrun in ctc_unpack_skb\n",
-						dev->name);
-					ch->logflags |= LOG_FLAG_OVERRUN;
-#ifndef DEBUG
-				}
-#endif
-				return;
-			}
-			skb_put(pskb, LL_HEADER_LENGTH);
-		}
-	}
-}
-
-/**
- * Check return code of a preceeding ccw_device call, halt_IO etc...
- *
- * @param ch          The channel, the error belongs to.
- * @param return_code The error code to inspect.
- */
-static void
-ccw_check_return_code(struct channel *ch, int return_code, char *msg)
-{
-	DBF_TEXT(trace, 5, __FUNCTION__);
-	switch (return_code) {
-		case 0:
-			fsm_event(ch->fsm, CH_EVENT_IO_SUCCESS, ch);
-			break;
-		case -EBUSY:
-			ctc_pr_warn("%s (%s): Busy !\n", ch->id, msg);
-			fsm_event(ch->fsm, CH_EVENT_IO_EBUSY, ch);
-			break;
-		case -ENODEV:
-			ctc_pr_emerg("%s (%s): Invalid device called for IO\n",
-				     ch->id, msg);
-			fsm_event(ch->fsm, CH_EVENT_IO_ENODEV, ch);
-			break;
-		case -EIO:
-			ctc_pr_emerg("%s (%s): Status pending... \n",
-				     ch->id, msg);
-			fsm_event(ch->fsm, CH_EVENT_IO_EIO, ch);
-			break;
-		default:
-			ctc_pr_emerg("%s (%s): Unknown error in do_IO %04x\n",
-				     ch->id, msg, return_code);
-			fsm_event(ch->fsm, CH_EVENT_IO_UNKNOWN, ch);
-	}
-}
-
-/**
- * Check sense of a unit check.
- *
- * @param ch    The channel, the sense code belongs to.
- * @param sense The sense code to inspect.
- */
-static void
-ccw_unit_check(struct channel *ch, unsigned char sense)
-{
-	DBF_TEXT(trace, 5, __FUNCTION__);
-	if (sense & SNS0_INTERVENTION_REQ) {
-		if (sense & 0x01) {
-			ctc_pr_debug("%s: Interface disc. or Sel. reset "
-					"(remote)\n", ch->id);
-			fsm_event(ch->fsm, CH_EVENT_UC_RCRESET, ch);
-		} else {
-			ctc_pr_debug("%s: System reset (remote)\n", ch->id);
-			fsm_event(ch->fsm, CH_EVENT_UC_RSRESET, ch);
-		}
-	} else if (sense & SNS0_EQUIPMENT_CHECK) {
-		if (sense & SNS0_BUS_OUT_CHECK) {
-			ctc_pr_warn("%s: Hardware malfunction (remote)\n",
-				    ch->id);
-			fsm_event(ch->fsm, CH_EVENT_UC_HWFAIL, ch);
-		} else {
-			ctc_pr_warn("%s: Read-data parity error (remote)\n",
-				    ch->id);
-			fsm_event(ch->fsm, CH_EVENT_UC_RXPARITY, ch);
-		}
-	} else if (sense & SNS0_BUS_OUT_CHECK) {
-		if (sense & 0x04) {
-			ctc_pr_warn("%s: Data-streaming timeout)\n", ch->id);
-			fsm_event(ch->fsm, CH_EVENT_UC_TXTIMEOUT, ch);
-		} else {
-			ctc_pr_warn("%s: Data-transfer parity error\n", ch->id);
-			fsm_event(ch->fsm, CH_EVENT_UC_TXPARITY, ch);
-		}
-	} else if (sense & SNS0_CMD_REJECT) {
-		ctc_pr_warn("%s: Command reject\n", ch->id);
-	} else if (sense == 0) {
-		ctc_pr_debug("%s: Unit check ZERO\n", ch->id);
-		fsm_event(ch->fsm, CH_EVENT_UC_ZERO, ch);
-	} else {
-		ctc_pr_warn("%s: Unit Check with sense code: %02x\n",
-			    ch->id, sense);
-		fsm_event(ch->fsm, CH_EVENT_UC_UNKNOWN, ch);
-	}
-}
-
-static void
-ctc_purge_skb_queue(struct sk_buff_head *q)
-{
-	struct sk_buff *skb;
-
-	DBF_TEXT(trace, 5, __FUNCTION__);
-
-	while ((skb = skb_dequeue(q))) {
-		atomic_dec(&skb->users);
-		dev_kfree_skb_irq(skb);
-	}
-}
-
-static int
-ctc_checkalloc_buffer(struct channel *ch, int warn)
-{
-	DBF_TEXT(trace, 5, __FUNCTION__);
-	if ((ch->trans_skb == NULL) ||
-	    (ch->flags & CHANNEL_FLAGS_BUFSIZE_CHANGED)) {
-		if (ch->trans_skb != NULL)
-			dev_kfree_skb(ch->trans_skb);
-		clear_normalized_cda(&ch->ccw[1]);
-		ch->trans_skb = __dev_alloc_skb(ch->max_bufsize,
-						GFP_ATOMIC | GFP_DMA);
-		if (ch->trans_skb == NULL) {
-			if (warn)
-				ctc_pr_warn(
-					"%s: Couldn't alloc %s trans_skb\n",
-					ch->id,
-					(CHANNEL_DIRECTION(ch->flags) == READ) ?
-					"RX" : "TX");
-			return -ENOMEM;
-		}
-		ch->ccw[1].count = ch->max_bufsize;
-		if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
-			dev_kfree_skb(ch->trans_skb);
-			ch->trans_skb = NULL;
-			if (warn)
-				ctc_pr_warn(
-					"%s: set_normalized_cda for %s "
-					"trans_skb failed, dropping packets\n",
-					ch->id,
-					(CHANNEL_DIRECTION(ch->flags) == READ) ?
-					"RX" : "TX");
-			return -ENOMEM;
-		}
-		ch->ccw[1].count = 0;
-		ch->trans_skb_data = ch->trans_skb->data;
-		ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
-	}
-	return 0;
-}
-
-/**
- * Dummy NOP action for statemachines
- */
-static void
-fsm_action_nop(fsm_instance * fi, int event, void *arg)
-{
-}
-
-/**
- * Actions for channel - statemachines.
- *****************************************************************************/
-
-/**
- * Normal data has been send. Free the corresponding
- * skb (it's in io_queue), reset dev->tbusy and
- * revert to idle state.
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_txdone(fsm_instance * fi, int event, void *arg)
-{
-	struct channel *ch = (struct channel *) arg;
-	struct net_device *dev = ch->netdev;
-	struct ctc_priv *privptr = dev->priv;
-	struct sk_buff *skb;
-	int first = 1;
-	int i;
-	unsigned long duration;
-	struct timespec done_stamp = current_kernel_time();
-
-	DBF_TEXT(trace, 4, __FUNCTION__);
-
-	duration =
-	    (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
-	    (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
-	if (duration > ch->prof.tx_time)
-		ch->prof.tx_time = duration;
-
-	if (ch->irb->scsw.count != 0)
-		ctc_pr_debug("%s: TX not complete, remaining %d bytes\n",
-			     dev->name, ch->irb->scsw.count);
-	fsm_deltimer(&ch->timer);
-	while ((skb = skb_dequeue(&ch->io_queue))) {
-		privptr->stats.tx_packets++;
-		privptr->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
-		if (first) {
-			privptr->stats.tx_bytes += 2;
-			first = 0;
-		}
-		atomic_dec(&skb->users);
-		dev_kfree_skb_irq(skb);
-	}
-	spin_lock(&ch->collect_lock);
-	clear_normalized_cda(&ch->ccw[4]);
-	if (ch->collect_len > 0) {
-		int rc;
-
-		if (ctc_checkalloc_buffer(ch, 1)) {
-			spin_unlock(&ch->collect_lock);
-			return;
-		}
-		ch->trans_skb->data = ch->trans_skb_data;
-		skb_reset_tail_pointer(ch->trans_skb);
-		ch->trans_skb->len = 0;
-		if (ch->prof.maxmulti < (ch->collect_len + 2))
-			ch->prof.maxmulti = ch->collect_len + 2;
-		if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
-			ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
-		*((__u16 *) skb_put(ch->trans_skb, 2)) = ch->collect_len + 2;
-		i = 0;
-		while ((skb = skb_dequeue(&ch->collect_queue))) {
-			skb_copy_from_linear_data(skb, skb_put(ch->trans_skb,
-							       skb->len),
-						  skb->len);
-			privptr->stats.tx_packets++;
-			privptr->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
-			atomic_dec(&skb->users);
-			dev_kfree_skb_irq(skb);
-			i++;
-		}
-		ch->collect_len = 0;
-		spin_unlock(&ch->collect_lock);
-		ch->ccw[1].count = ch->trans_skb->len;
-		fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
-		ch->prof.send_stamp = current_kernel_time();
-		rc = ccw_device_start(ch->cdev, &ch->ccw[0],
-				      (unsigned long) ch, 0xff, 0);
-		ch->prof.doios_multi++;
-		if (rc != 0) {
-			privptr->stats.tx_dropped += i;
-			privptr->stats.tx_errors += i;
-			fsm_deltimer(&ch->timer);
-			ccw_check_return_code(ch, rc, "chained TX");
-		}
-	} else {
-		spin_unlock(&ch->collect_lock);
-		fsm_newstate(fi, CH_STATE_TXIDLE);
-	}
-	ctc_clear_busy(dev);
-}
-
-/**
- * Initial data is sent.
- * Notify device statemachine that we are up and
- * running.
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_txidle(fsm_instance * fi, int event, void *arg)
-{
-	struct channel *ch = (struct channel *) arg;
-
-	DBF_TEXT(trace, 4, __FUNCTION__);
-	fsm_deltimer(&ch->timer);
-	fsm_newstate(fi, CH_STATE_TXIDLE);
-	fsm_event(((struct ctc_priv *) ch->netdev->priv)->fsm, DEV_EVENT_TXUP,
-		  ch->netdev);
-}
-
-/**
- * Got normal data, check for sanity, queue it up, allocate new buffer
- * trigger bottom half, and initiate next read.
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_rx(fsm_instance * fi, int event, void *arg)
-{
-	struct channel *ch = (struct channel *) arg;
-	struct net_device *dev = ch->netdev;
-	struct ctc_priv *privptr = dev->priv;
-	int len = ch->max_bufsize - ch->irb->scsw.count;
-	struct sk_buff *skb = ch->trans_skb;
-	__u16 block_len = *((__u16 *) skb->data);
-	int check_len;
-	int rc;
-
-	DBF_TEXT(trace, 4, __FUNCTION__);
-	fsm_deltimer(&ch->timer);
-	if (len < 8) {
-		ctc_pr_debug("%s: got packet with length %d < 8\n",
-			     dev->name, len);
-		privptr->stats.rx_dropped++;
-		privptr->stats.rx_length_errors++;
-		goto again;
-	}
-	if (len > ch->max_bufsize) {
-		ctc_pr_debug("%s: got packet with length %d > %d\n",
-			     dev->name, len, ch->max_bufsize);
-		privptr->stats.rx_dropped++;
-		privptr->stats.rx_length_errors++;
-		goto again;
-	}
-
-	/**
-	 * VM TCP seems to have a bug sending 2 trailing bytes of garbage.
-	 */
-	switch (ch->protocol) {
-		case CTC_PROTO_S390:
-		case CTC_PROTO_OS390:
-			check_len = block_len + 2;
-			break;
-		default:
-			check_len = block_len;
-			break;
-	}
-	if ((len < block_len) || (len > check_len)) {
-		ctc_pr_debug("%s: got block length %d != rx length %d\n",
-			     dev->name, block_len, len);
-#ifdef DEBUG
-		ctc_dump_skb(skb, 0);
-#endif
-		*((__u16 *) skb->data) = len;
-		privptr->stats.rx_dropped++;
-		privptr->stats.rx_length_errors++;
-		goto again;
-	}
-	block_len -= 2;
-	if (block_len > 0) {
-		*((__u16 *) skb->data) = block_len;
-		ctc_unpack_skb(ch, skb);
-	}
- again:
-	skb->data = ch->trans_skb_data;
-	skb_reset_tail_pointer(skb);
-	skb->len = 0;
-	if (ctc_checkalloc_buffer(ch, 1))
-		return;
-	ch->ccw[1].count = ch->max_bufsize;
-	rc = ccw_device_start(ch->cdev, &ch->ccw[0], (unsigned long) ch, 0xff, 0);
-	if (rc != 0)
-		ccw_check_return_code(ch, rc, "normal RX");
-}
-
-static void ch_action_rxidle(fsm_instance * fi, int event, void *arg);
-
-/**
- * Initialize connection by sending a __u16 of value 0.
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_firstio(fsm_instance * fi, int event, void *arg)
-{
-	struct channel *ch = (struct channel *) arg;
-	int rc;
-
-	DBF_TEXT(trace, 4, __FUNCTION__);
-
-	if (fsm_getstate(fi) == CH_STATE_TXIDLE)
-		ctc_pr_debug("%s: remote side issued READ?, init ...\n", ch->id);
-	fsm_deltimer(&ch->timer);
-	if (ctc_checkalloc_buffer(ch, 1))
-		return;
-	if ((fsm_getstate(fi) == CH_STATE_SETUPWAIT) &&
-	    (ch->protocol == CTC_PROTO_OS390)) {
-		/* OS/390 resp. z/OS */
-		if (CHANNEL_DIRECTION(ch->flags) == READ) {
-			*((__u16 *) ch->trans_skb->data) = CTC_INITIAL_BLOCKLEN;
-			fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC,
-				     CH_EVENT_TIMER, ch);
-			ch_action_rxidle(fi, event, arg);
-		} else {
-			struct net_device *dev = ch->netdev;
-			fsm_newstate(fi, CH_STATE_TXIDLE);
-			fsm_event(((struct ctc_priv *) dev->priv)->fsm,
-				  DEV_EVENT_TXUP, dev);
-		}
-		return;
-	}
-
-	/**
-	 * Don't setup a timer for receiving the initial RX frame
-	 * if in compatibility mode, since VM TCP delays the initial
-	 * frame until it has some data to send.
-	 */
-	if ((CHANNEL_DIRECTION(ch->flags) == WRITE) ||
-	    (ch->protocol != CTC_PROTO_S390))
-		fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
-
-	*((__u16 *) ch->trans_skb->data) = CTC_INITIAL_BLOCKLEN;
-	ch->ccw[1].count = 2;	/* Transfer only length */
-
-	fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == READ)
-		     ? CH_STATE_RXINIT : CH_STATE_TXINIT);
-	rc = ccw_device_start(ch->cdev, &ch->ccw[0], (unsigned long) ch, 0xff, 0);
-	if (rc != 0) {
-		fsm_deltimer(&ch->timer);
-		fsm_newstate(fi, CH_STATE_SETUPWAIT);
-		ccw_check_return_code(ch, rc, "init IO");
-	}
-	/**
-	 * If in compatibility mode since we don't setup a timer, we
-	 * also signal RX channel up immediately. This enables us
-	 * to send packets early which in turn usually triggers some
-	 * reply from VM TCP which brings up the RX channel to it's
-	 * final state.
-	 */
-	if ((CHANNEL_DIRECTION(ch->flags) == READ) &&
-	    (ch->protocol == CTC_PROTO_S390)) {
-		struct net_device *dev = ch->netdev;
-		fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXUP,
-			  dev);
-	}
-}
-
-/**
- * Got initial data, check it. If OK,
- * notify device statemachine that we are up and
- * running.
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_rxidle(fsm_instance * fi, int event, void *arg)
-{
-	struct channel *ch = (struct channel *) arg;
-	struct net_device *dev = ch->netdev;
-	__u16 buflen;
-	int rc;
-
-	DBF_TEXT(trace, 4, __FUNCTION__);
-	fsm_deltimer(&ch->timer);
-	buflen = *((__u16 *) ch->trans_skb->data);
-#ifdef DEBUG
-	ctc_pr_debug("%s: Initial RX count %d\n", dev->name, buflen);
-#endif
-	if (buflen >= CTC_INITIAL_BLOCKLEN) {
-		if (ctc_checkalloc_buffer(ch, 1))
-			return;
-		ch->ccw[1].count = ch->max_bufsize;
-		fsm_newstate(fi, CH_STATE_RXIDLE);
-		rc = ccw_device_start(ch->cdev, &ch->ccw[0],
-				      (unsigned long) ch, 0xff, 0);
-		if (rc != 0) {
-			fsm_newstate(fi, CH_STATE_RXINIT);
-			ccw_check_return_code(ch, rc, "initial RX");
-		} else
-			fsm_event(((struct ctc_priv *) dev->priv)->fsm,
-				  DEV_EVENT_RXUP, dev);
-	} else {
-		ctc_pr_debug("%s: Initial RX count %d not %d\n",
-			     dev->name, buflen, CTC_INITIAL_BLOCKLEN);
-		ch_action_firstio(fi, event, arg);
-	}
-}
-
-/**
- * Set channel into extended mode.
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_setmode(fsm_instance * fi, int event, void *arg)
-{
-	struct channel *ch = (struct channel *) arg;
-	int rc;
-	unsigned long saveflags;
-
-	DBF_TEXT(trace, 4, __FUNCTION__);
-	fsm_deltimer(&ch->timer);
-	fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
-	fsm_newstate(fi, CH_STATE_SETUPWAIT);
-	saveflags = 0;	/* avoids compiler warning with
-			   spin_unlock_irqrestore */
-	if (event == CH_EVENT_TIMER)	// only for timer not yet locked
-		spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
-	rc = ccw_device_start(ch->cdev, &ch->ccw[6], (unsigned long) ch, 0xff, 0);
-	if (event == CH_EVENT_TIMER)
-		spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
-	if (rc != 0) {
-		fsm_deltimer(&ch->timer);
-		fsm_newstate(fi, CH_STATE_STARTWAIT);
-		ccw_check_return_code(ch, rc, "set Mode");
-	} else
-		ch->retry = 0;
-}
-
-/**
- * Setup channel.
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_start(fsm_instance * fi, int event, void *arg)
-{
-	struct channel *ch = (struct channel *) arg;
-	unsigned long saveflags;
-	int rc;
-	struct net_device *dev;
-
-	DBF_TEXT(trace, 4, __FUNCTION__);
-	if (ch == NULL) {
-		ctc_pr_warn("ch_action_start ch=NULL\n");
-		return;
-	}
-	if (ch->netdev == NULL) {
-		ctc_pr_warn("ch_action_start dev=NULL, id=%s\n", ch->id);
-		return;
-	}
-	dev = ch->netdev;
-
-#ifdef DEBUG
-	ctc_pr_debug("%s: %s channel start\n", dev->name,
-		     (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
-#endif
-
-	if (ch->trans_skb != NULL) {
-		clear_normalized_cda(&ch->ccw[1]);
-		dev_kfree_skb(ch->trans_skb);
-		ch->trans_skb = NULL;
-	}
-	if (CHANNEL_DIRECTION(ch->flags) == READ) {
-		ch->ccw[1].cmd_code = CCW_CMD_READ;
-		ch->ccw[1].flags = CCW_FLAG_SLI;
-		ch->ccw[1].count = 0;
-	} else {
-		ch->ccw[1].cmd_code = CCW_CMD_WRITE;
-		ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
-		ch->ccw[1].count = 0;
-	}
-	if (ctc_checkalloc_buffer(ch, 0)) {
-		ctc_pr_notice(
-			"%s: Could not allocate %s trans_skb, delaying "
-			"allocation until first transfer\n",
-			dev->name,
-			(CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
-	}
-
-	ch->ccw[0].cmd_code = CCW_CMD_PREPARE;
-	ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
-	ch->ccw[0].count = 0;
-	ch->ccw[0].cda = 0;
-	ch->ccw[2].cmd_code = CCW_CMD_NOOP;	/* jointed CE + DE */
-	ch->ccw[2].flags = CCW_FLAG_SLI;
-	ch->ccw[2].count = 0;
-	ch->ccw[2].cda = 0;
-	memcpy(&ch->ccw[3], &ch->ccw[0], sizeof (struct ccw1) * 3);
-	ch->ccw[4].cda = 0;
-	ch->ccw[4].flags &= ~CCW_FLAG_IDA;
-
-	fsm_newstate(fi, CH_STATE_STARTWAIT);
-	fsm_addtimer(&ch->timer, 1000, CH_EVENT_TIMER, ch);
-	spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
-	rc = ccw_device_halt(ch->cdev, (unsigned long) ch);
-	spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
-	if (rc != 0) {
-		if (rc != -EBUSY)
-		    fsm_deltimer(&ch->timer);
-		ccw_check_return_code(ch, rc, "initial HaltIO");
-	}
-#ifdef DEBUG
-	ctc_pr_debug("ctc: %s(): leaving\n", __func__);
-#endif
-}
-
-/**
- * Shutdown a channel.
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_haltio(fsm_instance * fi, int event, void *arg)
-{
-	struct channel *ch = (struct channel *) arg;
-	unsigned long saveflags;
-	int rc;
-	int oldstate;
-
-	DBF_TEXT(trace, 3, __FUNCTION__);
-	fsm_deltimer(&ch->timer);
-	fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
-	saveflags = 0;	/* avoids comp warning with
-			   spin_unlock_irqrestore */
-	if (event == CH_EVENT_STOP)	// only for STOP not yet locked
-		spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
-	oldstate = fsm_getstate(fi);
-	fsm_newstate(fi, CH_STATE_TERM);
-	rc = ccw_device_halt(ch->cdev, (unsigned long) ch);
-	if (event == CH_EVENT_STOP)
-		spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
-	if (rc != 0) {
-		if (rc != -EBUSY) {
-		    fsm_deltimer(&ch->timer);
-		    fsm_newstate(fi, oldstate);
-		}
-		ccw_check_return_code(ch, rc, "HaltIO in ch_action_haltio");
-	}
-}
-
-/**
- * A channel has successfully been halted.
- * Cleanup it's queue and notify interface statemachine.
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_stopped(fsm_instance * fi, int event, void *arg)
-{
-	struct channel *ch = (struct channel *) arg;
-	struct net_device *dev = ch->netdev;
-
-	DBF_TEXT(trace, 3, __FUNCTION__);
-	fsm_deltimer(&ch->timer);
-	fsm_newstate(fi, CH_STATE_STOPPED);
-	if (ch->trans_skb != NULL) {
-		clear_normalized_cda(&ch->ccw[1]);
-		dev_kfree_skb(ch->trans_skb);
-		ch->trans_skb = NULL;
-	}
-	if (CHANNEL_DIRECTION(ch->flags) == READ) {
-		skb_queue_purge(&ch->io_queue);
-		fsm_event(((struct ctc_priv *) dev->priv)->fsm,
-			  DEV_EVENT_RXDOWN, dev);
-	} else {
-		ctc_purge_skb_queue(&ch->io_queue);
-		spin_lock(&ch->collect_lock);
-		ctc_purge_skb_queue(&ch->collect_queue);
-		ch->collect_len = 0;
-		spin_unlock(&ch->collect_lock);
-		fsm_event(((struct ctc_priv *) dev->priv)->fsm,
-			  DEV_EVENT_TXDOWN, dev);
-	}
-}
-
-/**
- * A stop command from device statemachine arrived and we are in
- * not operational mode. Set state to stopped.
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_stop(fsm_instance * fi, int event, void *arg)
-{
-	fsm_newstate(fi, CH_STATE_STOPPED);
-}
-
-/**
- * A machine check for no path, not operational status or gone device has
- * happened.
- * Cleanup queue and notify interface statemachine.
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_fail(fsm_instance * fi, int event, void *arg)
-{
-	struct channel *ch = (struct channel *) arg;
-	struct net_device *dev = ch->netdev;
-
-	DBF_TEXT(trace, 3, __FUNCTION__);
-	fsm_deltimer(&ch->timer);
-	fsm_newstate(fi, CH_STATE_NOTOP);
-	if (CHANNEL_DIRECTION(ch->flags) == READ) {
-		skb_queue_purge(&ch->io_queue);
-		fsm_event(((struct ctc_priv *) dev->priv)->fsm,
-			  DEV_EVENT_RXDOWN, dev);
-	} else {
-		ctc_purge_skb_queue(&ch->io_queue);
-		spin_lock(&ch->collect_lock);
-		ctc_purge_skb_queue(&ch->collect_queue);
-		ch->collect_len = 0;
-		spin_unlock(&ch->collect_lock);
-		fsm_event(((struct ctc_priv *) dev->priv)->fsm,
-			  DEV_EVENT_TXDOWN, dev);
-	}
-}
-
-/**
- * Handle error during setup of channel.
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_setuperr(fsm_instance * fi, int event, void *arg)
-{
-	struct channel *ch = (struct channel *) arg;
-	struct net_device *dev = ch->netdev;
-
-	DBF_TEXT(setup, 3, __FUNCTION__);
-	/**
-	 * Special case: Got UC_RCRESET on setmode.
-	 * This means that remote side isn't setup. In this case
-	 * simply retry after some 10 secs...
-	 */
-	if ((fsm_getstate(fi) == CH_STATE_SETUPWAIT) &&
-	    ((event == CH_EVENT_UC_RCRESET) ||
-	     (event == CH_EVENT_UC_RSRESET))) {
-		fsm_newstate(fi, CH_STATE_STARTRETRY);
-		fsm_deltimer(&ch->timer);
-		fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
-		if (CHANNEL_DIRECTION(ch->flags) == READ) {
-			int rc = ccw_device_halt(ch->cdev, (unsigned long) ch);
-			if (rc != 0)
-				ccw_check_return_code(
-					ch, rc, "HaltIO in ch_action_setuperr");
-		}
-		return;
-	}
-
-	ctc_pr_debug("%s: Error %s during %s channel setup state=%s\n",
-		     dev->name, ch_event_names[event],
-		     (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX",
-		     fsm_getstate_str(fi));
-	if (CHANNEL_DIRECTION(ch->flags) == READ) {
-		fsm_newstate(fi, CH_STATE_RXERR);
-		fsm_event(((struct ctc_priv *) dev->priv)->fsm,
-			  DEV_EVENT_RXDOWN, dev);
-	} else {
-		fsm_newstate(fi, CH_STATE_TXERR);
-		fsm_event(((struct ctc_priv *) dev->priv)->fsm,
-			  DEV_EVENT_TXDOWN, dev);
-	}
-}
-
-/**
- * Restart a channel after an error.
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_restart(fsm_instance * fi, int event, void *arg)
-{
-	unsigned long saveflags;
-	int oldstate;
-	int rc;
-
-	struct channel *ch = (struct channel *) arg;
-	struct net_device *dev = ch->netdev;
-
-	DBF_TEXT(trace, 3, __FUNCTION__);
-	fsm_deltimer(&ch->timer);
-	ctc_pr_debug("%s: %s channel restart\n", dev->name,
-		     (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
-	fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
-	oldstate = fsm_getstate(fi);
-	fsm_newstate(fi, CH_STATE_STARTWAIT);
-	saveflags = 0;	/* avoids compiler warning with
-			   spin_unlock_irqrestore */
-	if (event == CH_EVENT_TIMER)	// only for timer not yet locked
-		spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
-	rc = ccw_device_halt(ch->cdev, (unsigned long) ch);
-	if (event == CH_EVENT_TIMER)
-		spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
-	if (rc != 0) {
-		if (rc != -EBUSY) {
-		    fsm_deltimer(&ch->timer);
-		    fsm_newstate(fi, oldstate);
-		}
-		ccw_check_return_code(ch, rc, "HaltIO in ch_action_restart");
-	}
-}
-
-/**
- * Handle error during RX initial handshake (exchange of
- * 0-length block header)
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_rxiniterr(fsm_instance * fi, int event, void *arg)
-{
-	struct channel *ch = (struct channel *) arg;
-	struct net_device *dev = ch->netdev;
-
-	DBF_TEXT(setup, 3, __FUNCTION__);
-	if (event == CH_EVENT_TIMER) {
-		fsm_deltimer(&ch->timer);
-		ctc_pr_debug("%s: Timeout during RX init handshake\n", dev->name);
-		if (ch->retry++ < 3)
-			ch_action_restart(fi, event, arg);
-		else {
-			fsm_newstate(fi, CH_STATE_RXERR);
-			fsm_event(((struct ctc_priv *) dev->priv)->fsm,
-				  DEV_EVENT_RXDOWN, dev);
-		}
-	} else
-		ctc_pr_warn("%s: Error during RX init handshake\n", dev->name);
-}
-
-/**
- * Notify device statemachine if we gave up initialization
- * of RX channel.
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_rxinitfail(fsm_instance * fi, int event, void *arg)
-{
-	struct channel *ch = (struct channel *) arg;
-	struct net_device *dev = ch->netdev;
-
-	DBF_TEXT(setup, 3, __FUNCTION__);
-	fsm_newstate(fi, CH_STATE_RXERR);
-	ctc_pr_warn("%s: RX initialization failed\n", dev->name);
-	ctc_pr_warn("%s: RX <-> RX connection detected\n", dev->name);
-	fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXDOWN, dev);
-}
-
-/**
- * Handle RX Unit check remote reset (remote disconnected)
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_rxdisc(fsm_instance * fi, int event, void *arg)
-{
-	struct channel *ch = (struct channel *) arg;
-	struct channel *ch2;
-	struct net_device *dev = ch->netdev;
-
-	DBF_TEXT(trace, 3, __FUNCTION__);
-	fsm_deltimer(&ch->timer);
-	ctc_pr_debug("%s: Got remote disconnect, re-initializing ...\n",
-		     dev->name);
-
-	/**
-	 * Notify device statemachine
-	 */
-	fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXDOWN, dev);
-	fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_TXDOWN, dev);
-
-	fsm_newstate(fi, CH_STATE_DTERM);
-	ch2 = ((struct ctc_priv *) dev->priv)->channel[WRITE];
-	fsm_newstate(ch2->fsm, CH_STATE_DTERM);
-
-	ccw_device_halt(ch->cdev, (unsigned long) ch);
-	ccw_device_halt(ch2->cdev, (unsigned long) ch2);
-}
-
-/**
- * Handle error during TX channel initialization.
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_txiniterr(fsm_instance * fi, int event, void *arg)
-{
-	struct channel *ch = (struct channel *) arg;
-	struct net_device *dev = ch->netdev;
-
-	DBF_TEXT(setup, 2, __FUNCTION__);
-	if (event == CH_EVENT_TIMER) {
-		fsm_deltimer(&ch->timer);
-		ctc_pr_debug("%s: Timeout during TX init handshake\n", dev->name);
-		if (ch->retry++ < 3)
-			ch_action_restart(fi, event, arg);
-		else {
-			fsm_newstate(fi, CH_STATE_TXERR);
-			fsm_event(((struct ctc_priv *) dev->priv)->fsm,
-				  DEV_EVENT_TXDOWN, dev);
-		}
-	} else
-		ctc_pr_warn("%s: Error during TX init handshake\n", dev->name);
-}
-
-/**
- * Handle TX timeout by retrying operation.
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_txretry(fsm_instance * fi, int event, void *arg)
-{
-	struct channel *ch = (struct channel *) arg;
-	struct net_device *dev = ch->netdev;
-	unsigned long saveflags;
-
-	DBF_TEXT(trace, 4, __FUNCTION__);
-	fsm_deltimer(&ch->timer);
-	if (ch->retry++ > 3) {
-		ctc_pr_debug("%s: TX retry failed, restarting channel\n",
-			     dev->name);
-		fsm_event(((struct ctc_priv *) dev->priv)->fsm,
-			  DEV_EVENT_TXDOWN, dev);
-		ch_action_restart(fi, event, arg);
-	} else {
-		struct sk_buff *skb;
-
-		ctc_pr_debug("%s: TX retry %d\n", dev->name, ch->retry);
-		if ((skb = skb_peek(&ch->io_queue))) {
-			int rc = 0;
-
-			clear_normalized_cda(&ch->ccw[4]);
-			ch->ccw[4].count = skb->len;
-			if (set_normalized_cda(&ch->ccw[4], skb->data)) {
-				ctc_pr_debug(
-					"%s: IDAL alloc failed, chan restart\n",
-					dev->name);
-				fsm_event(((struct ctc_priv *) dev->priv)->fsm,
-					  DEV_EVENT_TXDOWN, dev);
-				ch_action_restart(fi, event, arg);
-				return;
-			}
-			fsm_addtimer(&ch->timer, 1000, CH_EVENT_TIMER, ch);
-			saveflags = 0;	/* avoids compiler warning with
-					   spin_unlock_irqrestore */
-			if (event == CH_EVENT_TIMER) // only for TIMER not yet locked
-				spin_lock_irqsave(get_ccwdev_lock(ch->cdev),
-						  saveflags);
-			rc = ccw_device_start(ch->cdev, &ch->ccw[3],
-					      (unsigned long) ch, 0xff, 0);
-			if (event == CH_EVENT_TIMER)
-				spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
-						       saveflags);
-			if (rc != 0) {
-				fsm_deltimer(&ch->timer);
-				ccw_check_return_code(ch, rc, "TX in ch_action_txretry");
-				ctc_purge_skb_queue(&ch->io_queue);
-			}
-		}
-	}
-
-}
-
-/**
- * Handle fatal errors during an I/O command.
- *
- * @param fi    An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_iofatal(fsm_instance * fi, int event, void *arg)
-{
-	struct channel *ch = (struct channel *) arg;
-	struct net_device *dev = ch->netdev;
-
-	DBF_TEXT(trace, 3, __FUNCTION__);
-	fsm_deltimer(&ch->timer);
-	if (CHANNEL_DIRECTION(ch->flags) == READ) {
-		ctc_pr_debug("%s: RX I/O error\n", dev->name);
-		fsm_newstate(fi, CH_STATE_RXERR);
-		fsm_event(((struct ctc_priv *) dev->priv)->fsm,
-			  DEV_EVENT_RXDOWN, dev);
-	} else {
-		ctc_pr_debug("%s: TX I/O error\n", dev->name);
-		fsm_newstate(fi, CH_STATE_TXERR);
-		fsm_event(((struct ctc_priv *) dev->priv)->fsm,
-			  DEV_EVENT_TXDOWN, dev);
-	}
-}
-
-static void
-ch_action_reinit(fsm_instance *fi, int event, void *arg)
-{
- 	struct channel *ch = (struct channel *)arg;
- 	struct net_device *dev = ch->netdev;
- 	struct ctc_priv *privptr = dev->priv;
-
-	DBF_TEXT(trace, 4, __FUNCTION__);
- 	ch_action_iofatal(fi, event, arg);
- 	fsm_addtimer(&privptr->restart_timer, 1000, DEV_EVENT_RESTART, dev);
-}
-
-/**
- * The statemachine for a channel.
- */
-static const fsm_node ch_fsm[] = {
-	{CH_STATE_STOPPED,    CH_EVENT_STOP,       fsm_action_nop       },
-	{CH_STATE_STOPPED,    CH_EVENT_START,      ch_action_start      },
-	{CH_STATE_STOPPED,    CH_EVENT_FINSTAT,    fsm_action_nop       },
-	{CH_STATE_STOPPED,    CH_EVENT_MC_FAIL,    fsm_action_nop       },
-
-	{CH_STATE_NOTOP,      CH_EVENT_STOP,       ch_action_stop       },
-	{CH_STATE_NOTOP,      CH_EVENT_START,      fsm_action_nop       },
-	{CH_STATE_NOTOP,      CH_EVENT_FINSTAT,    fsm_action_nop       },
-	{CH_STATE_NOTOP,      CH_EVENT_MC_FAIL,    fsm_action_nop       },
-	{CH_STATE_NOTOP,      CH_EVENT_MC_GOOD,    ch_action_start      },
-
-	{CH_STATE_STARTWAIT,  CH_EVENT_STOP,       ch_action_haltio     },
-	{CH_STATE_STARTWAIT,  CH_EVENT_START,      fsm_action_nop       },
-	{CH_STATE_STARTWAIT,  CH_EVENT_FINSTAT,    ch_action_setmode    },
-	{CH_STATE_STARTWAIT,  CH_EVENT_TIMER,      ch_action_setuperr   },
-	{CH_STATE_STARTWAIT,  CH_EVENT_IO_ENODEV,  ch_action_iofatal    },
-	{CH_STATE_STARTWAIT,  CH_EVENT_IO_EIO,     ch_action_reinit     },
-	{CH_STATE_STARTWAIT,  CH_EVENT_MC_FAIL,    ch_action_fail       },
-
-	{CH_STATE_STARTRETRY, CH_EVENT_STOP,       ch_action_haltio     },
-	{CH_STATE_STARTRETRY, CH_EVENT_TIMER,      ch_action_setmode    },
-	{CH_STATE_STARTRETRY, CH_EVENT_FINSTAT,    fsm_action_nop       },
-	{CH_STATE_STARTRETRY, CH_EVENT_MC_FAIL,    ch_action_fail       },
-
-	{CH_STATE_SETUPWAIT,  CH_EVENT_STOP,       ch_action_haltio     },
-	{CH_STATE_SETUPWAIT,  CH_EVENT_START,      fsm_action_nop       },
-	{CH_STATE_SETUPWAIT,  CH_EVENT_FINSTAT,    ch_action_firstio    },
-	{CH_STATE_SETUPWAIT,  CH_EVENT_UC_RCRESET, ch_action_setuperr   },
-	{CH_STATE_SETUPWAIT,  CH_EVENT_UC_RSRESET, ch_action_setuperr   },
-	{CH_STATE_SETUPWAIT,  CH_EVENT_TIMER,      ch_action_setmode    },
-	{CH_STATE_SETUPWAIT,  CH_EVENT_IO_ENODEV,  ch_action_iofatal    },
-	{CH_STATE_SETUPWAIT,  CH_EVENT_IO_EIO,     ch_action_reinit     },
-	{CH_STATE_SETUPWAIT,  CH_EVENT_MC_FAIL,    ch_action_fail       },
-
-	{CH_STATE_RXINIT,     CH_EVENT_STOP,       ch_action_haltio     },
-	{CH_STATE_RXINIT,     CH_EVENT_START,      fsm_action_nop       },
-	{CH_STATE_RXINIT,     CH_EVENT_FINSTAT,    ch_action_rxidle     },
-	{CH_STATE_RXINIT,     CH_EVENT_UC_RCRESET, ch_action_rxiniterr  },
-	{CH_STATE_RXINIT,     CH_EVENT_UC_RSRESET, ch_action_rxiniterr  },
-	{CH_STATE_RXINIT,     CH_EVENT_TIMER,      ch_action_rxiniterr  },
-	{CH_STATE_RXINIT,     CH_EVENT_ATTNBUSY,   ch_action_rxinitfail },
-	{CH_STATE_RXINIT,     CH_EVENT_IO_ENODEV,  ch_action_iofatal    },
-	{CH_STATE_RXINIT,     CH_EVENT_IO_EIO,     ch_action_reinit     },
-	{CH_STATE_RXINIT,     CH_EVENT_UC_ZERO,    ch_action_firstio    },
-	{CH_STATE_RXINIT,     CH_EVENT_MC_FAIL,    ch_action_fail       },
-
-	{CH_STATE_RXIDLE,     CH_EVENT_STOP,       ch_action_haltio     },
-	{CH_STATE_RXIDLE,     CH_EVENT_START,      fsm_action_nop       },
-	{CH_STATE_RXIDLE,     CH_EVENT_FINSTAT,    ch_action_rx         },
-	{CH_STATE_RXIDLE,     CH_EVENT_UC_RCRESET, ch_action_rxdisc     },
-//      {CH_STATE_RXIDLE,     CH_EVENT_UC_RSRESET, ch_action_rxretry    },
-	{CH_STATE_RXIDLE,     CH_EVENT_IO_ENODEV,  ch_action_iofatal    },
-	{CH_STATE_RXIDLE,     CH_EVENT_IO_EIO,     ch_action_reinit     },
-	{CH_STATE_RXIDLE,     CH_EVENT_MC_FAIL,    ch_action_fail       },
-	{CH_STATE_RXIDLE,     CH_EVENT_UC_ZERO,    ch_action_rx         },
-
-	{CH_STATE_TXINIT,     CH_EVENT_STOP,       ch_action_haltio     },
-	{CH_STATE_TXINIT,     CH_EVENT_START,      fsm_action_nop       },
-	{CH_STATE_TXINIT,     CH_EVENT_FINSTAT,    ch_action_txidle     },
-	{CH_STATE_TXINIT,     CH_EVENT_UC_RCRESET, ch_action_txiniterr  },
-	{CH_STATE_TXINIT,     CH_EVENT_UC_RSRESET, ch_action_txiniterr  },
-	{CH_STATE_TXINIT,     CH_EVENT_TIMER,      ch_action_txiniterr  },
-	{CH_STATE_TXINIT,     CH_EVENT_IO_ENODEV,  ch_action_iofatal    },
-	{CH_STATE_TXINIT,     CH_EVENT_IO_EIO,     ch_action_reinit     },
-	{CH_STATE_TXINIT,     CH_EVENT_MC_FAIL,    ch_action_fail       },
-
-	{CH_STATE_TXIDLE,     CH_EVENT_STOP,       ch_action_haltio     },
-	{CH_STATE_TXIDLE,     CH_EVENT_START,      fsm_action_nop       },
-	{CH_STATE_TXIDLE,     CH_EVENT_FINSTAT,    ch_action_firstio    },
-	{CH_STATE_TXIDLE,     CH_EVENT_UC_RCRESET, fsm_action_nop       },
-	{CH_STATE_TXIDLE,     CH_EVENT_UC_RSRESET, fsm_action_nop       },
-	{CH_STATE_TXIDLE,     CH_EVENT_IO_ENODEV,  ch_action_iofatal    },
-	{CH_STATE_TXIDLE,     CH_EVENT_IO_EIO,     ch_action_reinit     },
-	{CH_STATE_TXIDLE,     CH_EVENT_MC_FAIL,    ch_action_fail       },
-
-	{CH_STATE_TERM,       CH_EVENT_STOP,       fsm_action_nop       },
-	{CH_STATE_TERM,       CH_EVENT_START,      ch_action_restart    },
-	{CH_STATE_TERM,       CH_EVENT_FINSTAT,    ch_action_stopped    },
-	{CH_STATE_TERM,       CH_EVENT_UC_RCRESET, fsm_action_nop       },
-	{CH_STATE_TERM,       CH_EVENT_UC_RSRESET, fsm_action_nop       },
-	{CH_STATE_TERM,       CH_EVENT_MC_FAIL,    ch_action_fail       },
-
-	{CH_STATE_DTERM,      CH_EVENT_STOP,       ch_action_haltio     },
-	{CH_STATE_DTERM,      CH_EVENT_START,      ch_action_restart    },
-	{CH_STATE_DTERM,      CH_EVENT_FINSTAT,    ch_action_setmode    },
-	{CH_STATE_DTERM,      CH_EVENT_UC_RCRESET, fsm_action_nop       },
-	{CH_STATE_DTERM,      CH_EVENT_UC_RSRESET, fsm_action_nop       },
-	{CH_STATE_DTERM,      CH_EVENT_MC_FAIL,    ch_action_fail       },
-
-	{CH_STATE_TX,         CH_EVENT_STOP,       ch_action_haltio     },
-	{CH_STATE_TX,         CH_EVENT_START,      fsm_action_nop       },
-	{CH_STATE_TX,         CH_EVENT_FINSTAT,    ch_action_txdone     },
-	{CH_STATE_TX,         CH_EVENT_UC_RCRESET, ch_action_txretry    },
-	{CH_STATE_TX,         CH_EVENT_UC_RSRESET, ch_action_txretry    },
-	{CH_STATE_TX,         CH_EVENT_TIMER,      ch_action_txretry    },
-	{CH_STATE_TX,         CH_EVENT_IO_ENODEV,  ch_action_iofatal    },
-	{CH_STATE_TX,         CH_EVENT_IO_EIO,     ch_action_reinit     },
-	{CH_STATE_TX,         CH_EVENT_MC_FAIL,    ch_action_fail       },
-
-	{CH_STATE_RXERR,      CH_EVENT_STOP,       ch_action_haltio     },
-	{CH_STATE_TXERR,      CH_EVENT_STOP,       ch_action_haltio     },
-	{CH_STATE_TXERR,      CH_EVENT_MC_FAIL,    ch_action_fail       },
-	{CH_STATE_RXERR,      CH_EVENT_MC_FAIL,    ch_action_fail       },
-};
-
-static const int CH_FSM_LEN = sizeof (ch_fsm) / sizeof (fsm_node);
-
-/**
- * Functions related to setup and device detection.
- *****************************************************************************/
-
-static inline int
-less_than(char *id1, char *id2)
-{
-	int dev1, dev2, i;
-
-	for (i = 0; i < 5; i++) {
-		id1++;
-		id2++;
-	}
-	dev1 = simple_strtoul(id1, &id1, 16);
-	dev2 = simple_strtoul(id2, &id2, 16);
-
-	return (dev1 < dev2);
-}
-
-/**
- * Add a new channel to the list of channels.
- * Keeps the channel list sorted.
- *
- * @param cdev  The ccw_device to be added.
- * @param type  The type class of the new channel.
- *
- * @return 0 on success, !0 on error.
- */
-static int
-add_channel(struct ccw_device *cdev, enum channel_types type)
-{
-	struct channel **c = &channels;
-	struct channel *ch;
-
-	DBF_TEXT(trace, 2, __FUNCTION__);
-	ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
-	if (!ch) {
-		ctc_pr_warn("ctc: Out of memory in add_channel\n");
-		return -1;
-	}
-	/* assure all flags and counters are reset */
-	ch->ccw = kzalloc(8 * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
-	if (!ch->ccw) {
-		kfree(ch);
-		ctc_pr_warn("ctc: Out of memory in add_channel\n");
-		return -1;
-	}
-
-
-	/**
-	 * "static" ccws are used in the following way:
-	 *
-	 * ccw[0..2] (Channel program for generic I/O):
-	 *           0: prepare
-	 *           1: read or write (depending on direction) with fixed
-	 *              buffer (idal allocated once when buffer is allocated)
-	 *           2: nop
-	 * ccw[3..5] (Channel program for direct write of packets)
-	 *           3: prepare
-	 *           4: write (idal allocated on every write).
-	 *           5: nop
-	 * ccw[6..7] (Channel program for initial channel setup):
-	 *           6: set extended mode
-	 *           7: nop
-	 *
-	 * ch->ccw[0..5] are initialized in ch_action_start because
-	 * the channel's direction is yet unknown here.
-	 */
-	ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
-	ch->ccw[6].flags = CCW_FLAG_SLI;
-
-	ch->ccw[7].cmd_code = CCW_CMD_NOOP;
-	ch->ccw[7].flags = CCW_FLAG_SLI;
-
-	ch->cdev = cdev;
-	snprintf(ch->id, CTC_ID_SIZE, "ch-%s", cdev->dev.bus_id);
-	ch->type = type;
-	ch->fsm = init_fsm(ch->id, ch_state_names,
-			   ch_event_names, NR_CH_STATES, NR_CH_EVENTS,
-			   ch_fsm, CH_FSM_LEN, GFP_KERNEL);
-	if (ch->fsm == NULL) {
-		ctc_pr_warn("ctc: Could not create FSM in add_channel\n");
-		kfree(ch->ccw);
-		kfree(ch);
-		return -1;
-	}
-	fsm_newstate(ch->fsm, CH_STATE_IDLE);
-	ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
-	if (!ch->irb) {
-		ctc_pr_warn("ctc: Out of memory in add_channel\n");
-		kfree_fsm(ch->fsm);
-		kfree(ch->ccw);
-		kfree(ch);
-		return -1;
-	}
-	while (*c && less_than((*c)->id, ch->id))
-		c = &(*c)->next;
-	if (*c && (!strncmp((*c)->id, ch->id, CTC_ID_SIZE))) {
-		ctc_pr_debug(
-			"ctc: add_channel: device %s already in list, "
-			"using old entry\n", (*c)->id);
-		kfree(ch->irb);
-		kfree_fsm(ch->fsm);
-		kfree(ch->ccw);
-		kfree(ch);
-		return 0;
-	}
-
-	spin_lock_init(&ch->collect_lock);
-
-	fsm_settimer(ch->fsm, &ch->timer);
-	skb_queue_head_init(&ch->io_queue);
-	skb_queue_head_init(&ch->collect_queue);
-	ch->next = *c;
-	*c = ch;
-	return 0;
-}
-
-/**
- * Release a specific channel in the channel list.
- *
- * @param ch Pointer to channel struct to be released.
- */
-static void
-channel_free(struct channel *ch)
-{
-	ch->flags &= ~CHANNEL_FLAGS_INUSE;
-	fsm_newstate(ch->fsm, CH_STATE_IDLE);
-}
-
-/**
- * Remove a specific channel in the channel list.
- *
- * @param ch Pointer to channel struct to be released.
- */
-static void
-channel_remove(struct channel *ch)
-{
-	struct channel **c = &channels;
-
-	DBF_TEXT(trace, 2, __FUNCTION__);
-	if (ch == NULL)
-		return;
-
-	channel_free(ch);
-	while (*c) {
-		if (*c == ch) {
-			*c = ch->next;
-			fsm_deltimer(&ch->timer);
-			kfree_fsm(ch->fsm);
-			clear_normalized_cda(&ch->ccw[4]);
-			if (ch->trans_skb != NULL) {
-				clear_normalized_cda(&ch->ccw[1]);
-				dev_kfree_skb(ch->trans_skb);
-			}
-			kfree(ch->ccw);
-			kfree(ch->irb);
-			kfree(ch);
-			return;
-		}
-		c = &((*c)->next);
-	}
-}
-
-/**
- * Get a specific channel from the channel list.
- *
- * @param type Type of channel we are interested in.
- * @param id Id of channel we are interested in.
- * @param direction Direction we want to use this channel for.
- *
- * @return Pointer to a channel or NULL if no matching channel available.
- */
-static struct channel
-*
-channel_get(enum channel_types type, char *id, int direction)
-{
-	struct channel *ch = channels;
-
-	DBF_TEXT(trace, 3, __FUNCTION__);
-#ifdef DEBUG
-	ctc_pr_debug("ctc: %s(): searching for ch with id %s and type %d\n",
-		     __func__, id, type);
-#endif
-
-	while (ch && ((strncmp(ch->id, id, CTC_ID_SIZE)) || (ch->type != type))) {
-#ifdef DEBUG
-		ctc_pr_debug("ctc: %s(): ch=0x%p (id=%s, type=%d\n",
-			     __func__, ch, ch->id, ch->type);
-#endif
-		ch = ch->next;
-	}
-#ifdef DEBUG
-	ctc_pr_debug("ctc: %s(): ch=0x%pq (id=%s, type=%d\n",
-		     __func__, ch, ch->id, ch->type);
-#endif
-	if (!ch) {
-		ctc_pr_warn("ctc: %s(): channel with id %s "
-			    "and type %d not found in channel list\n",
-			    __func__, id, type);
-	} else {
-		if (ch->flags & CHANNEL_FLAGS_INUSE)
-			ch = NULL;
-		else {
-			ch->flags |= CHANNEL_FLAGS_INUSE;
-			ch->flags &= ~CHANNEL_FLAGS_RWMASK;
-			ch->flags |= (direction == WRITE)
-			    ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
-			fsm_newstate(ch->fsm, CH_STATE_STOPPED);
-		}
-	}
-	return ch;
-}
-
-/**
- * Return the channel type by name.
- *
- * @param name Name of network interface.
- *
- * @return Type class of channel to be used for that interface.
- */
-static enum channel_types inline
-extract_channel_media(char *name)
-{
-	enum channel_types ret = channel_type_unknown;
-
-	if (name != NULL) {
-		if (strncmp(name, "ctc", 3) == 0)
-			ret = channel_type_parallel;
-		if (strncmp(name, "escon", 5) == 0)
-			ret = channel_type_escon;
-	}
-	return ret;
-}
-
-static long
-__ctc_check_irb_error(struct ccw_device *cdev, struct irb *irb)
-{
-	if (!IS_ERR(irb))
-		return 0;
-
-	switch (PTR_ERR(irb)) {
-	case -EIO:
-		ctc_pr_warn("i/o-error on device %s\n", cdev->dev.bus_id);
-//		CTC_DBF_TEXT(trace, 2, "ckirberr");
-//		CTC_DBF_TEXT_(trace, 2, "  rc%d", -EIO);
-		break;
-	case -ETIMEDOUT:
-		ctc_pr_warn("timeout on device %s\n", cdev->dev.bus_id);
-//		CTC_DBF_TEXT(trace, 2, "ckirberr");
-//		CTC_DBF_TEXT_(trace, 2, "  rc%d", -ETIMEDOUT);
-		break;
-	default:
-		ctc_pr_warn("unknown error %ld on device %s\n", PTR_ERR(irb),
-			   cdev->dev.bus_id);
-//		CTC_DBF_TEXT(trace, 2, "ckirberr");
-//		CTC_DBF_TEXT(trace, 2, "  rc???");
-	}
-	return PTR_ERR(irb);
-}
-
-/**
- * Main IRQ handler.
- *
- * @param cdev    The ccw_device the interrupt is for.
- * @param intparm interruption parameter.
- * @param irb     interruption response block.
- */
-static void
-ctc_irq_handler(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
-{
-	struct channel *ch;
-	struct net_device *dev;
-	struct ctc_priv *priv;
-
-	DBF_TEXT(trace, 5, __FUNCTION__);
-	if (__ctc_check_irb_error(cdev, irb))
-		return;
-
-	/* Check for unsolicited interrupts. */
-	if (!cdev->dev.driver_data) {
-		ctc_pr_warn("ctc: Got unsolicited irq: %s c-%02x d-%02x\n",
-			    cdev->dev.bus_id, irb->scsw.cstat,
-			    irb->scsw.dstat);
-		return;
-	}
-
-	priv = ((struct ccwgroup_device *)cdev->dev.driver_data)
-		->dev.driver_data;
-
-	/* Try to extract channel from driver data. */
-	if (priv->channel[READ]->cdev == cdev)
-		ch = priv->channel[READ];
-	else if (priv->channel[WRITE]->cdev == cdev)
-		ch = priv->channel[WRITE];
-	else {
-		ctc_pr_err("ctc: Can't determine channel for interrupt, "
-			   "device %s\n", cdev->dev.bus_id);
-		return;
-	}
-
-	dev = (struct net_device *) (ch->netdev);
-	if (dev == NULL) {
-		ctc_pr_crit("ctc: ctc_irq_handler dev=NULL bus_id=%s, ch=0x%p\n",
-			    cdev->dev.bus_id, ch);
-		return;
-	}
-
-#ifdef DEBUG
-	ctc_pr_debug("%s: interrupt for device: %s received c-%02x d-%02x\n",
-		     dev->name, ch->id, irb->scsw.cstat, irb->scsw.dstat);
-#endif
-
-	/* Copy interruption response block. */
-	memcpy(ch->irb, irb, sizeof(struct irb));
-
-	/* Check for good subchannel return code, otherwise error message */
-	if (ch->irb->scsw.cstat) {
-		fsm_event(ch->fsm, CH_EVENT_SC_UNKNOWN, ch);
-		ctc_pr_warn("%s: subchannel check for device: %s - %02x %02x\n",
-			    dev->name, ch->id, ch->irb->scsw.cstat,
-			    ch->irb->scsw.dstat);
-		return;
-	}
-
-	/* Check the reason-code of a unit check */
-	if (ch->irb->scsw.dstat & DEV_STAT_UNIT_CHECK) {
-		ccw_unit_check(ch, ch->irb->ecw[0]);
-		return;
-	}
-	if (ch->irb->scsw.dstat & DEV_STAT_BUSY) {
-		if (ch->irb->scsw.dstat & DEV_STAT_ATTENTION)
-			fsm_event(ch->fsm, CH_EVENT_ATTNBUSY, ch);
-		else
-			fsm_event(ch->fsm, CH_EVENT_BUSY, ch);
-		return;
-	}
-	if (ch->irb->scsw.dstat & DEV_STAT_ATTENTION) {
-		fsm_event(ch->fsm, CH_EVENT_ATTN, ch);
-		return;
-	}
-	if ((ch->irb->scsw.stctl & SCSW_STCTL_SEC_STATUS) ||
-	    (ch->irb->scsw.stctl == SCSW_STCTL_STATUS_PEND) ||
-	    (ch->irb->scsw.stctl ==
-	     (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
-		fsm_event(ch->fsm, CH_EVENT_FINSTAT, ch);
-	else
-		fsm_event(ch->fsm, CH_EVENT_IRQ, ch);
-
-}
-
-/**
- * Actions for interface - statemachine.
- *****************************************************************************/
-
-/**
- * Startup channels by sending CH_EVENT_START to each channel.
- *
- * @param fi    An instance of an interface statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from struct net_device * upon call.
- */
-static void
-dev_action_start(fsm_instance * fi, int event, void *arg)
-{
-	struct net_device *dev = (struct net_device *) arg;
-	struct ctc_priv *privptr = dev->priv;
-	int direction;
-
-	DBF_TEXT(setup, 3, __FUNCTION__);
-	fsm_deltimer(&privptr->restart_timer);
-	fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
-	for (direction = READ; direction <= WRITE; direction++) {
-		struct channel *ch = privptr->channel[direction];
-		fsm_event(ch->fsm, CH_EVENT_START, ch);
-	}
-}
-
-/**
- * Shutdown channels by sending CH_EVENT_STOP to each channel.
- *
- * @param fi    An instance of an interface statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from struct net_device * upon call.
- */
-static void
-dev_action_stop(fsm_instance * fi, int event, void *arg)
-{
-	struct net_device *dev = (struct net_device *) arg;
-	struct ctc_priv *privptr = dev->priv;
-	int direction;
-
-	DBF_TEXT(trace, 3, __FUNCTION__);
-	fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
-	for (direction = READ; direction <= WRITE; direction++) {
-		struct channel *ch = privptr->channel[direction];
-		fsm_event(ch->fsm, CH_EVENT_STOP, ch);
-	}
-}
-static void
-dev_action_restart(fsm_instance *fi, int event, void *arg)
-{
-	struct net_device *dev = (struct net_device *)arg;
-	struct ctc_priv *privptr = dev->priv;
-
-	DBF_TEXT(trace, 3, __FUNCTION__);
-	ctc_pr_debug("%s: Restarting\n", dev->name);
-	dev_action_stop(fi, event, arg);
-	fsm_event(privptr->fsm, DEV_EVENT_STOP, dev);
-	fsm_addtimer(&privptr->restart_timer, CTC_TIMEOUT_5SEC,
-		     DEV_EVENT_START, dev);
-}
-
-/**
- * Called from channel statemachine
- * when a channel is up and running.
- *
- * @param fi    An instance of an interface statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from struct net_device * upon call.
- */
-static void
-dev_action_chup(fsm_instance * fi, int event, void *arg)
-{
-	struct net_device *dev = (struct net_device *) arg;
-
-	DBF_TEXT(trace, 3, __FUNCTION__);
-	switch (fsm_getstate(fi)) {
-		case DEV_STATE_STARTWAIT_RXTX:
-			if (event == DEV_EVENT_RXUP)
-				fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
-			else
-				fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
-			break;
-		case DEV_STATE_STARTWAIT_RX:
-			if (event == DEV_EVENT_RXUP) {
-				fsm_newstate(fi, DEV_STATE_RUNNING);
-				ctc_pr_info("%s: connected with remote side\n",
-					    dev->name);
-				ctc_clear_busy(dev);
-			}
-			break;
-		case DEV_STATE_STARTWAIT_TX:
-			if (event == DEV_EVENT_TXUP) {
-				fsm_newstate(fi, DEV_STATE_RUNNING);
-				ctc_pr_info("%s: connected with remote side\n",
-					    dev->name);
-				ctc_clear_busy(dev);
-			}
-			break;
-		case DEV_STATE_STOPWAIT_TX:
-			if (event == DEV_EVENT_RXUP)
-				fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
-			break;
-		case DEV_STATE_STOPWAIT_RX:
-			if (event == DEV_EVENT_TXUP)
-				fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
-			break;
-	}
-}
-
-/**
- * Called from channel statemachine
- * when a channel has been shutdown.
- *
- * @param fi    An instance of an interface statemachine.
- * @param event The event, just happened.
- * @param arg   Generic pointer, casted from struct net_device * upon call.
- */
-static void
-dev_action_chdown(fsm_instance * fi, int event, void *arg)
-{
-
-	DBF_TEXT(trace, 3, __FUNCTION__);
-	switch (fsm_getstate(fi)) {
-		case DEV_STATE_RUNNING:
-			if (event == DEV_EVENT_TXDOWN)
-				fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
-			else
-				fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
-			break;
-		case DEV_STATE_STARTWAIT_RX:
-			if (event == DEV_EVENT_TXDOWN)
-				fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
-			break;
-		case DEV_STATE_STARTWAIT_TX:
-			if (event == DEV_EVENT_RXDOWN)
-				fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
-			break;
-		case DEV_STATE_STOPWAIT_RXTX:
-			if (event == DEV_EVENT_TXDOWN)
-				fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
-			else
-				fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
-			break;
-		case DEV_STATE_STOPWAIT_RX:
-			if (event == DEV_EVENT_RXDOWN)
-				fsm_newstate(fi, DEV_STATE_STOPPED);
-			break;
-		case DEV_STATE_STOPWAIT_TX:
-			if (event == DEV_EVENT_TXDOWN)
-				fsm_newstate(fi, DEV_STATE_STOPPED);
-			break;
-	}
-}
-
-static const fsm_node dev_fsm[] = {
-	{DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start},
-
-	{DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_START,   dev_action_start   },
-	{DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_RXDOWN,  dev_action_chdown  },
-	{DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_TXDOWN,  dev_action_chdown  },
- 	{DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_RESTART, dev_action_restart },
-
-	{DEV_STATE_STOPWAIT_RX,    DEV_EVENT_START,   dev_action_start   },
-	{DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RXUP,    dev_action_chup    },
-	{DEV_STATE_STOPWAIT_RX,    DEV_EVENT_TXUP,    dev_action_chup    },
-	{DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RXDOWN,  dev_action_chdown  },
- 	{DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RESTART, dev_action_restart },
-
-	{DEV_STATE_STOPWAIT_TX,    DEV_EVENT_START,   dev_action_start   },
-	{DEV_STATE_STOPWAIT_TX,    DEV_EVENT_RXUP,    dev_action_chup    },
-	{DEV_STATE_STOPWAIT_TX,    DEV_EVENT_TXUP,    dev_action_chup    },
-	{DEV_STATE_STOPWAIT_TX,    DEV_EVENT_TXDOWN,  dev_action_chdown  },
- 	{DEV_STATE_STOPWAIT_TX,    DEV_EVENT_RESTART, dev_action_restart },
-
-	{DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP,    dev_action_stop    },
-	{DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP,    dev_action_chup    },
-	{DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP,    dev_action_chup    },
-	{DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN,  dev_action_chdown  },
-	{DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN,  dev_action_chdown  },
- 	{DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
-
-	{DEV_STATE_STARTWAIT_TX,   DEV_EVENT_STOP,    dev_action_stop    },
-	{DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RXUP,    dev_action_chup    },
-	{DEV_STATE_STARTWAIT_TX,   DEV_EVENT_TXUP,    dev_action_chup    },
-	{DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RXDOWN,  dev_action_chdown  },
- 	{DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RESTART, dev_action_restart },
-
-	{DEV_STATE_STARTWAIT_RX,   DEV_EVENT_STOP,    dev_action_stop    },
-	{DEV_STATE_STARTWAIT_RX,   DEV_EVENT_RXUP,    dev_action_chup    },
-	{DEV_STATE_STARTWAIT_RX,   DEV_EVENT_TXUP,    dev_action_chup    },
-	{DEV_STATE_STARTWAIT_RX,   DEV_EVENT_TXDOWN,  dev_action_chdown  },
- 	{DEV_STATE_STARTWAIT_RX,   DEV_EVENT_RESTART, dev_action_restart },
-
-	{DEV_STATE_RUNNING,        DEV_EVENT_STOP,    dev_action_stop    },
-	{DEV_STATE_RUNNING,        DEV_EVENT_RXDOWN,  dev_action_chdown  },
-	{DEV_STATE_RUNNING,        DEV_EVENT_TXDOWN,  dev_action_chdown  },
-	{DEV_STATE_RUNNING,        DEV_EVENT_TXUP,    fsm_action_nop     },
-	{DEV_STATE_RUNNING,        DEV_EVENT_RXUP,    fsm_action_nop     },
- 	{DEV_STATE_RUNNING,        DEV_EVENT_RESTART, dev_action_restart },
-};
-
-static const int DEV_FSM_LEN = sizeof (dev_fsm) / sizeof (fsm_node);
-
-/**
- * Transmit a packet.
- * This is a helper function for ctc_tx().
- *
- * @param ch Channel to be used for sending.
- * @param skb Pointer to struct sk_buff of packet to send.
- *            The linklevel header has already been set up
- *            by ctc_tx().
- *
- * @return 0 on success, -ERRNO on failure. (Never fails.)
- */
-static int
-transmit_skb(struct channel *ch, struct sk_buff *skb)
-{
-	unsigned long saveflags;
-	struct ll_header header;
-	int rc = 0;
-
-	DBF_TEXT(trace, 5, __FUNCTION__);
-	/* we need to acquire the lock for testing the state
-	 * otherwise we can have an IRQ changing the state to
-	 * TXIDLE after the test but before acquiring the lock.
-	 */
-	spin_lock_irqsave(&ch->collect_lock, saveflags);
-	if (fsm_getstate(ch->fsm) != CH_STATE_TXIDLE) {
-		int l = skb->len + LL_HEADER_LENGTH;
-
-		if (ch->collect_len + l > ch->max_bufsize - 2) {
-			spin_unlock_irqrestore(&ch->collect_lock, saveflags);
-			return -EBUSY;
-		} else {
-			atomic_inc(&skb->users);
-			header.length = l;
-			header.type = skb->protocol;
-			header.unused = 0;
-			memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
-			       LL_HEADER_LENGTH);
-			skb_queue_tail(&ch->collect_queue, skb);
-			ch->collect_len += l;
-		}
-		spin_unlock_irqrestore(&ch->collect_lock, saveflags);
-	} else {
-		__u16 block_len;
-		int ccw_idx;
-		struct sk_buff *nskb;
-		unsigned long hi;
-		spin_unlock_irqrestore(&ch->collect_lock, saveflags);
-		/**
-		 * Protect skb against beeing free'd by upper
-		 * layers.
-		 */
-		atomic_inc(&skb->users);
-		ch->prof.txlen += skb->len;
-		header.length = skb->len + LL_HEADER_LENGTH;
-		header.type = skb->protocol;
-		header.unused = 0;
-		memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
-		       LL_HEADER_LENGTH);
-		block_len = skb->len + 2;
-		*((__u16 *) skb_push(skb, 2)) = block_len;
-
-		/**
-		 * IDAL support in CTC is broken, so we have to
-		 * care about skb's above 2G ourselves.
-		 */
-		hi = ((unsigned long)skb_tail_pointer(skb) +
-		      LL_HEADER_LENGTH) >> 31;
-		if (hi) {
-			nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
-			if (!nskb) {
-				atomic_dec(&skb->users);
-				skb_pull(skb, LL_HEADER_LENGTH + 2);
-				ctc_clear_busy(ch->netdev);
-				return -ENOMEM;
-			} else {
-				memcpy(skb_put(nskb, skb->len),
-				       skb->data, skb->len);
-				atomic_inc(&nskb->users);
-				atomic_dec(&skb->users);
-				dev_kfree_skb_irq(skb);
-				skb = nskb;
-			}
-		}
-
-		ch->ccw[4].count = block_len;
-		if (set_normalized_cda(&ch->ccw[4], skb->data)) {
-			/**
-			 * idal allocation failed, try via copying to
-			 * trans_skb. trans_skb usually has a pre-allocated
-			 * idal.
-			 */
-			if (ctc_checkalloc_buffer(ch, 1)) {
-				/**
-				 * Remove our header. It gets added
-				 * again on retransmit.
-				 */
-				atomic_dec(&skb->users);
-				skb_pull(skb, LL_HEADER_LENGTH + 2);
-				ctc_clear_busy(ch->netdev);
-				return -EBUSY;
-			}
-
-			skb_reset_tail_pointer(ch->trans_skb);
-			ch->trans_skb->len = 0;
-			ch->ccw[1].count = skb->len;
-			skb_copy_from_linear_data(skb, skb_put(ch->trans_skb,
-							       skb->len),
-						  skb->len);
-			atomic_dec(&skb->users);
-			dev_kfree_skb_irq(skb);
-			ccw_idx = 0;
-		} else {
-			skb_queue_tail(&ch->io_queue, skb);
-			ccw_idx = 3;
-		}
-		ch->retry = 0;
-		fsm_newstate(ch->fsm, CH_STATE_TX);
-		fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
-		spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
-		ch->prof.send_stamp = current_kernel_time();
-		rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
-				      (unsigned long) ch, 0xff, 0);
-		spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
-		if (ccw_idx == 3)
-			ch->prof.doios_single++;
-		if (rc != 0) {
-			fsm_deltimer(&ch->timer);
-			ccw_check_return_code(ch, rc, "single skb TX");
-			if (ccw_idx == 3)
-				skb_dequeue_tail(&ch->io_queue);
-			/**
-			 * Remove our header. It gets added
-			 * again on retransmit.
-			 */
-			skb_pull(skb, LL_HEADER_LENGTH + 2);
-		} else {
-			if (ccw_idx == 0) {
-				struct net_device *dev = ch->netdev;
-				struct ctc_priv *privptr = dev->priv;
-				privptr->stats.tx_packets++;
-				privptr->stats.tx_bytes +=
-				    skb->len - LL_HEADER_LENGTH;
-			}
-		}
-	}
-
-	ctc_clear_busy(ch->netdev);
-	return rc;
-}
-
-/**
- * Interface API for upper network layers
- *****************************************************************************/
-
-/**
- * Open an interface.
- * Called from generic network layer when ifconfig up is run.
- *
- * @param dev Pointer to interface struct.
- *
- * @return 0 on success, -ERRNO on failure. (Never fails.)
- */
-static int
-ctc_open(struct net_device * dev)
-{
-	DBF_TEXT(trace, 5, __FUNCTION__);
-	fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_START, dev);
-	return 0;
-}
-
-/**
- * Close an interface.
- * Called from generic network layer when ifconfig down is run.
- *
- * @param dev Pointer to interface struct.
- *
- * @return 0 on success, -ERRNO on failure. (Never fails.)
- */
-static int
-ctc_close(struct net_device * dev)
-{
-	DBF_TEXT(trace, 5, __FUNCTION__);
-	fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_STOP, dev);
-	return 0;
-}
-
-/**
- * Start transmission of a packet.
- * Called from generic network device layer.
- *
- * @param skb Pointer to buffer containing the packet.
- * @param dev Pointer to interface struct.
- *
- * @return 0 if packet consumed, !0 if packet rejected.
- *         Note: If we return !0, then the packet is free'd by
- *               the generic network layer.
- */
-static int
-ctc_tx(struct sk_buff *skb, struct net_device * dev)
-{
-	int rc = 0;
-	struct ctc_priv *privptr = (struct ctc_priv *) dev->priv;
-
-	DBF_TEXT(trace, 5, __FUNCTION__);
-	/**
-	 * Some sanity checks ...
-	 */
-	if (skb == NULL) {
-		ctc_pr_warn("%s: NULL sk_buff passed\n", dev->name);
-		privptr->stats.tx_dropped++;
-		return 0;
-	}
-	if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
-		ctc_pr_warn("%s: Got sk_buff with head room < %ld bytes\n",
-			    dev->name, LL_HEADER_LENGTH + 2);
-		dev_kfree_skb(skb);
-		privptr->stats.tx_dropped++;
-		return 0;
-	}
-
-	/**
-	 * If channels are not running, try to restart them
-	 * and throw away packet.
-	 */
-	if (fsm_getstate(privptr->fsm) != DEV_STATE_RUNNING) {
-		fsm_event(privptr->fsm, DEV_EVENT_START, dev);
-		dev_kfree_skb(skb);
-		privptr->stats.tx_dropped++;
-		privptr->stats.tx_errors++;
-		privptr->stats.tx_carrier_errors++;
-		return 0;
-	}
-
-	if (ctc_test_and_set_busy(dev))
-		return -EBUSY;
-
-	dev->trans_start = jiffies;
-	if (transmit_skb(privptr->channel[WRITE], skb) != 0)
-		rc = 1;
-	return rc;
-}
-
-/**
- * Sets MTU of an interface.
- *
- * @param dev     Pointer to interface struct.
- * @param new_mtu The new MTU to use for this interface.
- *
- * @return 0 on success, -EINVAL if MTU is out of valid range.
- *         (valid range is 576 .. 65527). If VM is on the
- *         remote side, maximum MTU is 32760, however this is
- *         <em>not</em> checked here.
- */
-static int
-ctc_change_mtu(struct net_device * dev, int new_mtu)
-{
-	struct ctc_priv *privptr = (struct ctc_priv *) dev->priv;
-
-	DBF_TEXT(trace, 3, __FUNCTION__);
-	if ((new_mtu < 576) || (new_mtu > 65527) ||
-	    (new_mtu > (privptr->channel[READ]->max_bufsize -
-			LL_HEADER_LENGTH - 2)))
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	dev->hard_header_len = LL_HEADER_LENGTH + 2;
-	return 0;
-}
-
-/**
- * Returns interface statistics of a device.
- *
- * @param dev Pointer to interface struct.
- *
- * @return Pointer to stats struct of this interface.
- */
-static struct net_device_stats *
-ctc_stats(struct net_device * dev)
-{
-	return &((struct ctc_priv *) dev->priv)->stats;
-}
-
-/*
- * sysfs attributes
- */
-
-static ssize_t
-buffer_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct ctc_priv *priv;
-
-	priv = dev->driver_data;
-	if (!priv)
-		return -ENODEV;
-	return sprintf(buf, "%d\n",
-			priv->buffer_size);
-}
-
-static ssize_t
-buffer_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
-{
-	struct ctc_priv *priv;
-	struct net_device *ndev;
-	int bs1;
-	char buffer[16];
-
-	DBF_TEXT(trace, 3, __FUNCTION__);
-	DBF_TEXT(trace, 3, buf);
-	priv = dev->driver_data;
-	if (!priv) {
-		DBF_TEXT(trace, 3, "bfnopriv");
-		return -ENODEV;
-	}
-
-	sscanf(buf, "%u", &bs1);
-	if (bs1 > CTC_BUFSIZE_LIMIT)
-		goto einval;
-	if (bs1 < (576 + LL_HEADER_LENGTH + 2))
-		goto einval;
-	priv->buffer_size = bs1;	// just to overwrite the default
-
-	ndev = priv->channel[READ]->netdev;
-	if (!ndev) {
-		DBF_TEXT(trace, 3, "bfnondev");
-		return -ENODEV;
-	}
-
-	if ((ndev->flags & IFF_RUNNING) &&
-	    (bs1 < (ndev->mtu + LL_HEADER_LENGTH + 2)))
-		goto einval;
-
-	priv->channel[READ]->max_bufsize = bs1;
-	priv->channel[WRITE]->max_bufsize = bs1;
-	if (!(ndev->flags & IFF_RUNNING))
-		ndev->mtu = bs1 - LL_HEADER_LENGTH - 2;
-	priv->channel[READ]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED;
-	priv->channel[WRITE]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED;
-
-	sprintf(buffer, "%d",priv->buffer_size);
-	DBF_TEXT(trace, 3, buffer);
-	return count;
-
-einval:
-	DBF_TEXT(trace, 3, "buff_err");
-	return -EINVAL;
-}
-
-static ssize_t
-loglevel_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	return sprintf(buf, "%d\n", loglevel);
-}
-
-static ssize_t
-loglevel_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
-{
-	int ll1;
-
-	DBF_TEXT(trace, 5, __FUNCTION__);
-	sscanf(buf, "%i", &ll1);
-
-	if ((ll1 > CTC_LOGLEVEL_MAX) || (ll1 < 0))
-		return -EINVAL;
-	loglevel = ll1;
-	return count;
-}
-
-static void
-ctc_print_statistics(struct ctc_priv *priv)
-{
-	char *sbuf;
-	char *p;
-
-	DBF_TEXT(trace, 4, __FUNCTION__);
-	if (!priv)
-		return;
-	sbuf = kmalloc(2048, GFP_KERNEL);
-	if (sbuf == NULL)
-		return;
-	p = sbuf;
-
-	p += sprintf(p, "  Device FSM state: %s\n",
-		     fsm_getstate_str(priv->fsm));
-	p += sprintf(p, "  RX channel FSM state: %s\n",
-		     fsm_getstate_str(priv->channel[READ]->fsm));
-	p += sprintf(p, "  TX channel FSM state: %s\n",
-		     fsm_getstate_str(priv->channel[WRITE]->fsm));
-	p += sprintf(p, "  Max. TX buffer used: %ld\n",
-		     priv->channel[WRITE]->prof.maxmulti);
-	p += sprintf(p, "  Max. chained SKBs: %ld\n",
-		     priv->channel[WRITE]->prof.maxcqueue);
-	p += sprintf(p, "  TX single write ops: %ld\n",
-		     priv->channel[WRITE]->prof.doios_single);
-	p += sprintf(p, "  TX multi write ops: %ld\n",
-		     priv->channel[WRITE]->prof.doios_multi);
-	p += sprintf(p, "  Netto bytes written: %ld\n",
-		     priv->channel[WRITE]->prof.txlen);
-	p += sprintf(p, "  Max. TX IO-time: %ld\n",
-		     priv->channel[WRITE]->prof.tx_time);
-
-	ctc_pr_debug("Statistics for %s:\n%s",
-		     priv->channel[WRITE]->netdev->name, sbuf);
-	kfree(sbuf);
-	return;
-}
-
-static ssize_t
-stats_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct ctc_priv *priv = dev->driver_data;
-	if (!priv)
-		return -ENODEV;
-	ctc_print_statistics(priv);
-	return sprintf(buf, "0\n");
-}
-
-static ssize_t
-stats_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
-{
-	struct ctc_priv *priv = dev->driver_data;
-	if (!priv)
-		return -ENODEV;
-	/* Reset statistics */
-	memset(&priv->channel[WRITE]->prof, 0,
-			sizeof(priv->channel[WRITE]->prof));
-	return count;
-}
-
-static void
-ctc_netdev_unregister(struct net_device * dev)
-{
-	struct ctc_priv *privptr;
-
-	if (!dev)
-		return;
-	privptr = (struct ctc_priv *) dev->priv;
-	unregister_netdev(dev);
-}
-
-static int
-ctc_netdev_register(struct net_device * dev)
-{
-	return register_netdev(dev);
-}
-
-static void
-ctc_free_netdevice(struct net_device * dev, int free_dev)
-{
-	struct ctc_priv *privptr;
-	if (!dev)
-		return;
-	privptr = dev->priv;
-	if (privptr) {
-		if (privptr->fsm)
-			kfree_fsm(privptr->fsm);
-		kfree(privptr);
-	}
-#ifdef MODULE
-	if (free_dev)
-		free_netdev(dev);
-#endif
-}
-
-static ssize_t
-ctc_proto_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct ctc_priv *priv;
-
-	priv = dev->driver_data;
-	if (!priv)
-		return -ENODEV;
-
-	return sprintf(buf, "%d\n", priv->protocol);
-}
-
-static ssize_t
-ctc_proto_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
-{
-	struct ctc_priv *priv;
-	int value;
-
-	DBF_TEXT(trace, 3, __FUNCTION__);
-	pr_debug("%s() called\n", __FUNCTION__);
-
-	priv = dev->driver_data;
-	if (!priv)
-		return -ENODEV;
-	sscanf(buf, "%u", &value);
-	if (!((value == CTC_PROTO_S390)  ||
-	      (value == CTC_PROTO_LINUX) ||
-	      (value == CTC_PROTO_OS390)))
-		return -EINVAL;
-	priv->protocol = value;
-
-	return count;
-}
-
-static ssize_t
-ctc_type_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct ccwgroup_device *cgdev;
-
-	cgdev = to_ccwgroupdev(dev);
-	if (!cgdev)
-		return -ENODEV;
-
-	return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]);
-}
-
-static DEVICE_ATTR(buffer, 0644, buffer_show, buffer_write);
-static DEVICE_ATTR(protocol, 0644, ctc_proto_show, ctc_proto_store);
-static DEVICE_ATTR(type, 0444, ctc_type_show, NULL);
-
-static DEVICE_ATTR(loglevel, 0644, loglevel_show, loglevel_write);
-static DEVICE_ATTR(stats, 0644, stats_show, stats_write);
-
-static struct attribute *ctc_attr[] = {
-	&dev_attr_protocol.attr,
-	&dev_attr_type.attr,
-	&dev_attr_buffer.attr,
-	NULL,
-};
-
-static struct attribute_group ctc_attr_group = {
-	.attrs = ctc_attr,
-};
-
-static int
-ctc_add_attributes(struct device *dev)
-{
-	int rc;
-
-	rc = device_create_file(dev, &dev_attr_loglevel);
-	if (rc)
-		goto out;
-	rc = device_create_file(dev, &dev_attr_stats);
-	if (!rc)
-		goto out;
-	device_remove_file(dev, &dev_attr_loglevel);
-out:
-	return rc;
-}
-
-static void
-ctc_remove_attributes(struct device *dev)
-{
-	device_remove_file(dev, &dev_attr_stats);
-	device_remove_file(dev, &dev_attr_loglevel);
-}
-
-static int
-ctc_add_files(struct device *dev)
-{
-	pr_debug("%s() called\n", __FUNCTION__);
-
-	return sysfs_create_group(&dev->kobj, &ctc_attr_group);
-}
-
-static void
-ctc_remove_files(struct device *dev)
-{
-	pr_debug("%s() called\n", __FUNCTION__);
-
-	sysfs_remove_group(&dev->kobj, &ctc_attr_group);
-}
-
-/**
- * Add ctc specific attributes.
- * Add ctc private data.
- *
- * @param cgdev pointer to ccwgroup_device just added
- *
- * @returns 0 on success, !0 on failure.
- */
-static int
-ctc_probe_device(struct ccwgroup_device *cgdev)
-{
-	struct ctc_priv *priv;
-	int rc;
-	char buffer[16];
-
-	pr_debug("%s() called\n", __FUNCTION__);
-	DBF_TEXT(setup, 3, __FUNCTION__);
-
-	if (!get_device(&cgdev->dev))
-		return -ENODEV;
-
-	priv = kzalloc(sizeof(struct ctc_priv), GFP_KERNEL);
-	if (!priv) {
-		ctc_pr_err("%s: Out of memory\n", __func__);
-		put_device(&cgdev->dev);
-		return -ENOMEM;
-	}
-
-	rc = ctc_add_files(&cgdev->dev);
-	if (rc) {
-		kfree(priv);
-		put_device(&cgdev->dev);
-		return rc;
-	}
-	priv->buffer_size = CTC_BUFSIZE_DEFAULT;
-	cgdev->cdev[0]->handler = ctc_irq_handler;
-	cgdev->cdev[1]->handler = ctc_irq_handler;
-	cgdev->dev.driver_data = priv;
-
-	sprintf(buffer, "%p", priv);
-	DBF_TEXT(data, 3, buffer);
-
-	sprintf(buffer, "%u", (unsigned int)sizeof(struct ctc_priv));
-	DBF_TEXT(data, 3, buffer);
-
-	sprintf(buffer, "%p", &channels);
-	DBF_TEXT(data, 3, buffer);
-
-	sprintf(buffer, "%u", (unsigned int)sizeof(struct channel));
-	DBF_TEXT(data, 3, buffer);
-
-	return 0;
-}
-
-/**
- * Device setup function called by alloc_netdev().
- *
- * @param dev  Device to be setup.
- */
-void ctc_init_netdevice(struct net_device * dev)
-{
-	DBF_TEXT(setup, 3, __FUNCTION__);
-
-	if (dev->mtu == 0)
-		dev->mtu = CTC_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
-	dev->hard_start_xmit = ctc_tx;
-	dev->open = ctc_open;
-	dev->stop = ctc_close;
-	dev->get_stats = ctc_stats;
-	dev->change_mtu = ctc_change_mtu;
-	dev->hard_header_len = LL_HEADER_LENGTH + 2;
-	dev->addr_len = 0;
-	dev->type = ARPHRD_SLIP;
-	dev->tx_queue_len = 100;
-	dev->flags = IFF_POINTOPOINT | IFF_NOARP;
-}
-
-
-/**
- *
- * Setup an interface.
- *
- * @param cgdev  Device to be setup.
- *
- * @returns 0 on success, !0 on failure.
- */
-static int
-ctc_new_device(struct ccwgroup_device *cgdev)
-{
-	char read_id[CTC_ID_SIZE];
-	char write_id[CTC_ID_SIZE];
-	int direction;
-	enum channel_types type;
-	struct ctc_priv *privptr;
-	struct net_device *dev;
-	int ret;
-	char buffer[16];
-
-	pr_debug("%s() called\n", __FUNCTION__);
-	DBF_TEXT(setup, 3, __FUNCTION__);
-
-	privptr = cgdev->dev.driver_data;
-	if (!privptr)
-		return -ENODEV;
-
-	sprintf(buffer, "%d", privptr->buffer_size);
-	DBF_TEXT(setup, 3, buffer);
-
-	type = get_channel_type(&cgdev->cdev[0]->id);
-
-	snprintf(read_id, CTC_ID_SIZE, "ch-%s", cgdev->cdev[0]->dev.bus_id);
-	snprintf(write_id, CTC_ID_SIZE, "ch-%s", cgdev->cdev[1]->dev.bus_id);
-
-	if (add_channel(cgdev->cdev[0], type))
-		return -ENOMEM;
-	if (add_channel(cgdev->cdev[1], type))
-		return -ENOMEM;
-
-	ret = ccw_device_set_online(cgdev->cdev[0]);
-	if (ret != 0) {
-			printk(KERN_WARNING
-		 	"ccw_device_set_online (cdev[0]) failed with ret = %d\n", ret);
-	}
-
-	ret = ccw_device_set_online(cgdev->cdev[1]);
-	if (ret != 0) {
-			printk(KERN_WARNING
-		 	"ccw_device_set_online (cdev[1]) failed with ret = %d\n", ret);
-	}
-
-	dev = alloc_netdev(0, "ctc%d", ctc_init_netdevice);
-	if (!dev) {
-		ctc_pr_warn("ctc_init_netdevice failed\n");
-		goto out;
-	}
-	dev->priv = privptr;
-
-	privptr->fsm = init_fsm("ctcdev", dev_state_names,
-			dev_event_names, CTC_NR_DEV_STATES, CTC_NR_DEV_EVENTS,
-			dev_fsm, DEV_FSM_LEN, GFP_KERNEL);
-	if (privptr->fsm == NULL) {
-		free_netdev(dev);
-		goto out;
-	}
-	fsm_newstate(privptr->fsm, DEV_STATE_STOPPED);
-	fsm_settimer(privptr->fsm, &privptr->restart_timer);
-
-	for (direction = READ; direction <= WRITE; direction++) {
-		privptr->channel[direction] =
-		    channel_get(type, direction == READ ? read_id : write_id,
-				direction);
-		if (privptr->channel[direction] == NULL) {
-			if (direction == WRITE)
-				channel_free(privptr->channel[READ]);
-
-			ctc_free_netdevice(dev, 1);
-			goto out;
-		}
-		privptr->channel[direction]->netdev = dev;
-		privptr->channel[direction]->protocol = privptr->protocol;
-		privptr->channel[direction]->max_bufsize = privptr->buffer_size;
-	}
-	/* sysfs magic */
-	SET_NETDEV_DEV(dev, &cgdev->dev);
-
-	if (ctc_netdev_register(dev) != 0) {
-		ctc_free_netdevice(dev, 1);
-		goto out;
-	}
-
-	if (ctc_add_attributes(&cgdev->dev)) {
-		ctc_netdev_unregister(dev);
-		dev->priv = NULL;
-		ctc_free_netdevice(dev, 1);
-		goto out;
-	}
-
-	strlcpy(privptr->fsm->name, dev->name, sizeof (privptr->fsm->name));
-
-	print_banner();
-
-	ctc_pr_info("%s: read: %s, write: %s, proto: %d\n",
-		    dev->name, privptr->channel[READ]->id,
-		    privptr->channel[WRITE]->id, privptr->protocol);
-
-	return 0;
-out:
-	ccw_device_set_offline(cgdev->cdev[1]);
-	ccw_device_set_offline(cgdev->cdev[0]);
-
-	return -ENODEV;
-}
-
-/**
- * Shutdown an interface.
- *
- * @param cgdev  Device to be shut down.
- *
- * @returns 0 on success, !0 on failure.
- */
-static int
-ctc_shutdown_device(struct ccwgroup_device *cgdev)
-{
-	struct ctc_priv *priv;
-	struct net_device *ndev;
-
-	DBF_TEXT(setup, 3, __FUNCTION__);
-	pr_debug("%s() called\n", __FUNCTION__);
-
-
-	priv = cgdev->dev.driver_data;
-	ndev = NULL;
-	if (!priv)
-		return -ENODEV;
-
-	if (priv->channel[READ]) {
-		ndev = priv->channel[READ]->netdev;
-
-		/* Close the device */
-		ctc_close(ndev);
-		ndev->flags &=~IFF_RUNNING;
-
-		ctc_remove_attributes(&cgdev->dev);
-
-		channel_free(priv->channel[READ]);
-	}
-	if (priv->channel[WRITE])
-		channel_free(priv->channel[WRITE]);
-
-	if (ndev) {
-		ctc_netdev_unregister(ndev);
-		ndev->priv = NULL;
-		ctc_free_netdevice(ndev, 1);
-	}
-
-	if (priv->fsm)
-		kfree_fsm(priv->fsm);
-
-	ccw_device_set_offline(cgdev->cdev[1]);
-	ccw_device_set_offline(cgdev->cdev[0]);
-
-	if (priv->channel[READ])
-		channel_remove(priv->channel[READ]);
-	if (priv->channel[WRITE])
-		channel_remove(priv->channel[WRITE]);
-	priv->channel[READ] = priv->channel[WRITE] = NULL;
-
-	return 0;
-
-}
-
-static void
-ctc_remove_device(struct ccwgroup_device *cgdev)
-{
-	struct ctc_priv *priv;
-
-	pr_debug("%s() called\n", __FUNCTION__);
-	DBF_TEXT(setup, 3, __FUNCTION__);
-
-	priv = cgdev->dev.driver_data;
-	if (!priv)
-		return;
-	if (cgdev->state == CCWGROUP_ONLINE)
-		ctc_shutdown_device(cgdev);
-	ctc_remove_files(&cgdev->dev);
-	cgdev->dev.driver_data = NULL;
-	kfree(priv);
-	put_device(&cgdev->dev);
-}
-
-static struct ccwgroup_driver ctc_group_driver = {
-	.owner       = THIS_MODULE,
-	.name        = "ctc",
-	.max_slaves  = 2,
-	.driver_id   = 0xC3E3C3,
-	.probe       = ctc_probe_device,
-	.remove      = ctc_remove_device,
-	.set_online  = ctc_new_device,
-	.set_offline = ctc_shutdown_device,
-};
-
-/**
- * Module related routines
- *****************************************************************************/
-
-/**
- * Prepare to be unloaded. Free IRQ's and release all resources.
- * This is called just before this module is unloaded. It is
- * <em>not</em> called, if the usage count is !0, so we don't need to check
- * for that.
- */
-static void __exit
-ctc_exit(void)
-{
-	DBF_TEXT(setup, 3, __FUNCTION__);
-	unregister_cu3088_discipline(&ctc_group_driver);
-	ctc_unregister_dbf_views();
-	ctc_pr_info("CTC driver unloaded\n");
-}
-
-/**
- * Initialize module.
- * This is called just after the module is loaded.
- *
- * @return 0 on success, !0 on error.
- */
-static int __init
-ctc_init(void)
-{
-	int ret = 0;
-
-	loglevel = CTC_LOGLEVEL_DEFAULT;
-
-	DBF_TEXT(setup, 3, __FUNCTION__);
-
-	print_banner();
-
-	ret = ctc_register_dbf_views();
-	if (ret){
-		ctc_pr_crit("ctc_init failed with ctc_register_dbf_views rc = %d\n", ret);
-		return ret;
-	}
-	ret = register_cu3088_discipline(&ctc_group_driver);
-	if (ret) {
-		ctc_unregister_dbf_views();
-	}
-	return ret;
-}
-
-module_init(ctc_init);
-module_exit(ctc_exit);
-
-/* --- This is the END my friend --- */

drivers/s390/net/ctcmain.h

···
-/*
- * CTC / ESCON network driver
- *
- * Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
- * Author(s): Fritz Elfert ([e-mail], [e-mail])
-	      Peter Tiedemann ([e-mail])
- *
- *
- * Documentation used:
- *  - Principles of Operation (IBM doc#: SA22-7201-06)
- *  - Common IO/-Device Commands and Self Description (IBM doc#: SA22-7204-02)
- *  - Common IO/-Device Commands and Self Description (IBM doc#: SN22-5535)
- *  - ESCON Channel-to-Channel Adapter (IBM doc#: SA22-7203-00)
- *  - ESCON I/O Interface (IBM doc#: SA22-7202-029
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- */
-
-#ifndef _CTCMAIN_H_
-#define _CTCMAIN_H_
-
-#include <asm/ccwdev.h>
-#include <asm/ccwgroup.h>
-
-#include <linux/skbuff.h>
-#include <linux/netdevice.h>
-
-#include "fsm.h"
-#include "cu3088.h"
-
-
-/**
- * CCW commands, used in this driver.
- */
-#define CCW_CMD_WRITE		0x01
-#define CCW_CMD_READ		0x02
-#define CCW_CMD_SET_EXTENDED	0xc3
-#define CCW_CMD_PREPARE		0xe3
-
-#define CTC_PROTO_S390          0
-#define CTC_PROTO_LINUX         1
-#define CTC_PROTO_OS390         3
-
-#define CTC_BUFSIZE_LIMIT       65535
-#define CTC_BUFSIZE_DEFAULT     32768
-
-#define CTC_TIMEOUT_5SEC        5000
-
-#define CTC_INITIAL_BLOCKLEN    2
-
-#define READ			0
-#define WRITE			1
-
-#define CTC_ID_SIZE             BUS_ID_SIZE+3
-
-
-struct ctc_profile {
-	unsigned long maxmulti;
-	unsigned long maxcqueue;
-	unsigned long doios_single;
-	unsigned long doios_multi;
-	unsigned long txlen;
-	unsigned long tx_time;
-	struct timespec send_stamp;
-};
-
-/**
- * Definition of one channel
- */
-struct channel {
-
-	/**
-	 * Pointer to next channel in list.
-	 */
-	struct channel *next;
-	char id[CTC_ID_SIZE];
-	struct ccw_device *cdev;
-
-	/**
-	 * Type of this channel.
-	 * CTC/A or Escon for valid channels.
-	 */
-	enum channel_types type;
-
-	/**
-	 * Misc. flags. See CHANNEL_FLAGS_... below
-	 */
-	__u32 flags;
-
-	/**
-	 * The protocol of this channel
-	 */
-	__u16 protocol;
-
-	/**
-	 * I/O and irq related stuff
-	 */
-	struct ccw1 *ccw;
-	struct irb *irb;
-
-	/**
-	 * RX/TX buffer size
-	 */
-	int max_bufsize;
-
-	/**
-	 * Transmit/Receive buffer.
-	 */
-	struct sk_buff *trans_skb;
-
-	/**
-	 * Universal I/O queue.
-	 */
-	struct sk_buff_head io_queue;
-
-	/**
-	 * TX queue for collecting skb's during busy.
-	 */
-	struct sk_buff_head collect_queue;
-
-	/**
-	 * Amount of data in collect_queue.
-	 */
-	int collect_len;
-
-	/**
-	 * spinlock for collect_queue and collect_len
-	 */
-	spinlock_t collect_lock;
-
-	/**
-	 * Timer for detecting unresposive
-	 * I/O operations.
-	 */
-	fsm_timer timer;
-
-	/**
-	 * Retry counter for misc. operations.
-	 */
-	int retry;
-
-	/**
-	 * The finite state machine of this channel
-	 */
-	fsm_instance *fsm;
-
-	/**
-	 * The corresponding net_device this channel
-	 * belongs to.
-	 */
-	struct net_device *netdev;
-
-	struct ctc_profile prof;
-
-	unsigned char *trans_skb_data;
-
-	__u16 logflags;
-};
-
-#define CHANNEL_FLAGS_READ            0
-#define CHANNEL_FLAGS_WRITE           1
-#define CHANNEL_FLAGS_INUSE           2
-#define CHANNEL_FLAGS_BUFSIZE_CHANGED 4
-#define CHANNEL_FLAGS_FAILED          8
-#define CHANNEL_FLAGS_WAITIRQ        16
-#define CHANNEL_FLAGS_RWMASK 1
-#define CHANNEL_DIRECTION(f) (f & CHANNEL_FLAGS_RWMASK)
-
-#define LOG_FLAG_ILLEGALPKT  1
-#define LOG_FLAG_ILLEGALSIZE 2
-#define LOG_FLAG_OVERRUN     4
-#define LOG_FLAG_NOMEM       8
-
-#define CTC_LOGLEVEL_INFO     1
-#define CTC_LOGLEVEL_NOTICE   2
-#define CTC_LOGLEVEL_WARN     4
-#define CTC_LOGLEVEL_EMERG    8
-#define CTC_LOGLEVEL_ERR     16
-#define CTC_LOGLEVEL_DEBUG   32
-#define CTC_LOGLEVEL_CRIT    64
-
-#define CTC_LOGLEVEL_DEFAULT \
-(CTC_LOGLEVEL_INFO | CTC_LOGLEVEL_NOTICE | CTC_LOGLEVEL_WARN | CTC_LOGLEVEL_CRIT)
-
-#define CTC_LOGLEVEL_MAX     ((CTC_LOGLEVEL_CRIT<<1)-1)
-
-#define ctc_pr_debug(fmt, arg...) \
-do { if (loglevel & CTC_LOGLEVEL_DEBUG) printk(KERN_DEBUG fmt,##arg); } while (0)
-
-#define ctc_pr_info(fmt, arg...) \
-do { if (loglevel & CTC_LOGLEVEL_INFO) printk(KERN_INFO fmt,##arg); } while (0)
-
-#define ctc_pr_notice(fmt, arg...) \
-do { if (loglevel & CTC_LOGLEVEL_NOTICE) printk(KERN_NOTICE fmt,##arg); } while (0)
-
-#define ctc_pr_warn(fmt, arg...) \
-do { if (loglevel & CTC_LOGLEVEL_WARN) printk(KERN_WARNING fmt,##arg); } while (0)
-
-#define ctc_pr_emerg(fmt, arg...) \
-do { if (loglevel & CTC_LOGLEVEL_EMERG) printk(KERN_EMERG fmt,##arg); } while (0)
-
-#define ctc_pr_err(fmt, arg...) \
-do { if (loglevel & CTC_LOGLEVEL_ERR) printk(KERN_ERR fmt,##arg); } while (0)
-
-#define ctc_pr_crit(fmt, arg...) \
-do { if (loglevel & CTC_LOGLEVEL_CRIT) printk(KERN_CRIT fmt,##arg); } while (0)
-
-struct ctc_priv {
-	struct net_device_stats stats;
-	unsigned long tbusy;
-	/**
-	 * The finite state machine of this interface.
-	 */
-	fsm_instance *fsm;
-	/**
-	 * The protocol of this device
-	 */
-	__u16 protocol;
- 	/**
- 	 * Timer for restarting after I/O Errors
- 	 */
- 	fsm_timer               restart_timer;
-
-	int buffer_size;
-
-	struct channel *channel[2];
-};
-
-/**
- * Definition of our link level header.
- */
-struct ll_header {
-	__u16 length;
-	__u16 type;
-	__u16 unused;
-};
-#define LL_HEADER_LENGTH (sizeof(struct ll_header))
-
-/**
- * Compatibility macros for busy handling
- * of network devices.
- */
-static __inline__ void
-ctc_clear_busy(struct net_device * dev)
-{
-	clear_bit(0, &(((struct ctc_priv *) dev->priv)->tbusy));
-	netif_wake_queue(dev);
-}
-
-static __inline__ int
-ctc_test_and_set_busy(struct net_device * dev)
-{
-	netif_stop_queue(dev);
-	return test_and_set_bit(0, &((struct ctc_priv *) dev->priv)->tbusy);
-}
-
-#endif