Merge branch 'linus' into timers/nohz

1 files changed, 326 insertions, 1363 deletions

diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c
index 8c7e2b778ef..90abfd06ed5 100644
--- a/drivers/s390/scsi/zfcp_aux.c
+++ b/drivers/s390/scsi/zfcp_aux.c
@@ -1,22 +1,9 @@
 /*
- * This file is part of the zfcp device driver for
- * FCP adapters for IBM System z9 and zSeries.
+ * zfcp device driver
  *
- * (C) Copyright IBM Corp. 2002, 2006
+ * Module interface and handling of zfcp data structures.
  *
- * 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.
+ * Copyright IBM Corporation 2002, 2008
  */
 
 /*
@@ -31,93 +18,25 @@
  *            Maxim Shchetynin
  *            Volker Sameske
  *            Ralph Wuerthner
+ *            Michael Loehr
+ *            Swen Schillig
+ *            Christof Schmitt
+ *            Martin Petermann
+ *            Sven Schuetz
  */
 
+#include <linux/miscdevice.h>
 #include "zfcp_ext.h"
 
-/* accumulated log level (module parameter) */
-static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
 static char *device;
-/*********************** FUNCTION PROTOTYPES *********************************/
-
-/* written against the module interface */
-static int __init  zfcp_module_init(void);
-
-/* FCP related */
-static void zfcp_ns_gid_pn_handler(unsigned long);
-
-/* miscellaneous */
-static int zfcp_sg_list_alloc(struct zfcp_sg_list *, size_t);
-static void zfcp_sg_list_free(struct zfcp_sg_list *);
-static int zfcp_sg_list_copy_from_user(struct zfcp_sg_list *,
-				       void __user *, size_t);
-static int zfcp_sg_list_copy_to_user(void __user *,
-				     struct zfcp_sg_list *, size_t);
-static long zfcp_cfdc_dev_ioctl(struct file *, unsigned int, unsigned long);
-
-#define ZFCP_CFDC_IOC_MAGIC                     0xDD
-#define ZFCP_CFDC_IOC \
-	_IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_sense_data)
-
-
-static const struct file_operations zfcp_cfdc_fops = {
-	.unlocked_ioctl = zfcp_cfdc_dev_ioctl,
-#ifdef CONFIG_COMPAT
-	.compat_ioctl = zfcp_cfdc_dev_ioctl
-#endif
-};
-
-static struct miscdevice zfcp_cfdc_misc = {
-	.minor = ZFCP_CFDC_DEV_MINOR,
-	.name = ZFCP_CFDC_DEV_NAME,
-	.fops = &zfcp_cfdc_fops
-};
-
-/*********************** KERNEL/MODULE PARAMETERS  ***************************/
-
-/* declare driver module init/cleanup functions */
-module_init(zfcp_module_init);
 
 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
-MODULE_DESCRIPTION
-    ("FCP (SCSI over Fibre Channel) HBA driver for IBM System z9 and zSeries");
+MODULE_DESCRIPTION("FCP HBA driver");
 MODULE_LICENSE("GPL");
 
 module_param(device, charp, 0400);
 MODULE_PARM_DESC(device, "specify initial device");
 
-module_param(loglevel, uint, 0400);
-MODULE_PARM_DESC(loglevel,
-		 "log levels, 8 nibbles: "
-		 "FC ERP QDIO CIO Config FSF SCSI Other, "
-		 "levels: 0=none 1=normal 2=devel 3=trace");
-
-/****************************************************************/
-/************** Functions without logging ***********************/
-/****************************************************************/
-
-void
-_zfcp_hex_dump(char *addr, int count)
-{
-	int i;
-	for (i = 0; i < count; i++) {
-		printk("%02x", addr[i]);
-		if ((i % 4) == 3)
-			printk(" ");
-		if ((i % 32) == 31)
-			printk("\n");
-	}
-	if (((i-1) % 32) != 31)
-		printk("\n");
-}
-
-
-/****************************************************************/
-/****** Functions to handle the request ID hash table    ********/
-/****************************************************************/
-
-#define ZFCP_LOG_AREA			ZFCP_LOG_AREA_FSF
-
 static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter)
 {
 	int idx;
@@ -132,11 +51,12 @@ static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter)
 	return 0;
 }
 
-static void zfcp_reqlist_free(struct zfcp_adapter *adapter)
-{
-	kfree(adapter->req_list);
-}
-
+/**
+ * zfcp_reqlist_isempty - is the request list empty
+ * @adapter: pointer to struct zfcp_adapter
+ *
+ * Returns: true if list is empty, false otherwise
+ */
 int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
 {
 	unsigned int idx;
@@ -147,62 +67,58 @@ int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
 	return 1;
 }
 
-#undef ZFCP_LOG_AREA
-
-/****************************************************************/
-/************** Uncategorised Functions *************************/
-/****************************************************************/
-
-#define ZFCP_LOG_AREA			ZFCP_LOG_AREA_OTHER
-
-/**
- * zfcp_device_setup - setup function
- * @str: pointer to parameter string
- *
- * Parse "device=..." parameter string.
- */
-static int __init
-zfcp_device_setup(char *devstr)
+static int __init zfcp_device_setup(char *devstr)
 {
-	char *tmp, *str;
-	size_t len;
+	char *token;
+	char *str;
 
 	if (!devstr)
 		return 0;
 
-	len = strlen(devstr) + 1;
-	str = kmalloc(len, GFP_KERNEL);
+	/* duplicate devstr and keep the original for sysfs presentation*/
+	str = kmalloc(strlen(devstr) + 1, GFP_KERNEL);
 	if (!str)
-		goto err_out;
-	memcpy(str, devstr, len);
+		return 0;
 
-	tmp = strchr(str, ',');
-	if (!tmp)
-		goto err_out;
-	*tmp++ = '\0';
-	strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
-	zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
+	strcpy(str, devstr);
 
-	zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
-	if (*tmp++ != ',')
+	token = strsep(&str, ",");
+	if (!token || strlen(token) >= BUS_ID_SIZE)
 		goto err_out;
-	if (*tmp == '\0')
+	strncpy(zfcp_data.init_busid, token, BUS_ID_SIZE);
+
+	token = strsep(&str, ",");
+	if (!token || strict_strtoull(token, 0, &zfcp_data.init_wwpn))
 		goto err_out;
 
-	zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
-	if (*tmp != '\0')
+	token = strsep(&str, ",");
+	if (!token || strict_strtoull(token, 0, &zfcp_data.init_fcp_lun))
 		goto err_out;
+
 	kfree(str);
 	return 1;
 
  err_out:
-	ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
 	kfree(str);
+	pr_err("zfcp: Parse error for device parameter string %s, "
+	       "device not attached.\n", devstr);
 	return 0;
 }
 
-static void __init
-zfcp_init_device_configure(void)
+static struct zfcp_adapter *zfcp_get_adapter_by_busid(char *bus_id)
+{
+	struct zfcp_adapter *adapter;
+
+	list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list)
+		if ((strncmp(bus_id, adapter->ccw_device->dev.bus_id,
+			     BUS_ID_SIZE) == 0) &&
+		    !(atomic_read(&adapter->status) &
+		      ZFCP_STATUS_COMMON_REMOVE))
+		    return adapter;
+	return NULL;
+}
+
+static void __init zfcp_init_device_configure(void)
 {
 	struct zfcp_adapter *adapter;
 	struct zfcp_port *port;
@@ -215,101 +131,75 @@ zfcp_init_device_configure(void)
 		zfcp_adapter_get(adapter);
 	read_unlock_irq(&zfcp_data.config_lock);
 
-	if (adapter == NULL)
+	if (!adapter)
 		goto out_adapter;
 	port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
-	if (!port)
+	if (IS_ERR(port))
 		goto out_port;
 	unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
-	if (!unit)
+	if (IS_ERR(unit))
 		goto out_unit;
 	up(&zfcp_data.config_sema);
 	ccw_device_set_online(adapter->ccw_device);
 	zfcp_erp_wait(adapter);
 	down(&zfcp_data.config_sema);
 	zfcp_unit_put(unit);
- out_unit:
+out_unit:
 	zfcp_port_put(port);
- out_port:
+out_port:
 	zfcp_adapter_put(adapter);
- out_adapter:
+out_adapter:
 	up(&zfcp_data.config_sema);
 	return;
 }
 
-static int calc_alignment(int size)
+static struct kmem_cache *zfcp_cache_create(int size, char *name)
 {
 	int align = 1;
-
-	if (!size)
-		return 0;
-
 	while ((size - align) > 0)
 		align <<= 1;
-
-	return align;
+	return kmem_cache_create(name , size, align, 0, NULL);
 }
 
-static int __init
-zfcp_module_init(void)
+static int __init zfcp_module_init(void)
 {
 	int retval = -ENOMEM;
-	int size, align;
 
-	size = sizeof(struct zfcp_fsf_req_qtcb);
-	align = calc_alignment(size);
-	zfcp_data.fsf_req_qtcb_cache =
-		kmem_cache_create("zfcp_fsf", size, align, 0, NULL);
+	zfcp_data.fsf_req_qtcb_cache = zfcp_cache_create(
+			sizeof(struct zfcp_fsf_req_qtcb), "zfcp_fsf");
 	if (!zfcp_data.fsf_req_qtcb_cache)
 		goto out;
 
-	size = sizeof(struct fsf_status_read_buffer);
-	align = calc_alignment(size);
-	zfcp_data.sr_buffer_cache =
-		kmem_cache_create("zfcp_sr", size, align, 0, NULL);
+	zfcp_data.sr_buffer_cache = zfcp_cache_create(
+			sizeof(struct fsf_status_read_buffer), "zfcp_sr");
 	if (!zfcp_data.sr_buffer_cache)
 		goto out_sr_cache;
 
-	size = sizeof(struct zfcp_gid_pn_data);
-	align = calc_alignment(size);
-	zfcp_data.gid_pn_cache =
-		kmem_cache_create("zfcp_gid", size, align, 0, NULL);
+	zfcp_data.gid_pn_cache = zfcp_cache_create(
+			sizeof(struct zfcp_gid_pn_data), "zfcp_gid");
 	if (!zfcp_data.gid_pn_cache)
 		goto out_gid_cache;
 
-	atomic_set(&zfcp_data.loglevel, loglevel);
-
-	/* initialize adapter list */
 	INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
-
-	/* initialize adapters to be removed list head */
 	INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
 
+	sema_init(&zfcp_data.config_sema, 1);
+	rwlock_init(&zfcp_data.config_lock);
+
 	zfcp_data.scsi_transport_template =
 		fc_attach_transport(&zfcp_transport_functions);
 	if (!zfcp_data.scsi_transport_template)
 		goto out_transport;
 
 	retval = misc_register(&zfcp_cfdc_misc);
-	if (retval != 0) {
-		ZFCP_LOG_INFO("registration of misc device "
-			      "zfcp_cfdc failed\n");
+	if (retval) {
+		pr_err("zfcp: registration of misc device zfcp_cfdc failed\n");
 		goto out_misc;
 	}
 
-	ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
-		       ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
-
-	/* Initialise proc semaphores */
-	sema_init(&zfcp_data.config_sema, 1);
-
-	/* initialise configuration rw lock */
-	rwlock_init(&zfcp_data.config_lock);
-
-	/* setup dynamic I/O */
 	retval = zfcp_ccw_register();
 	if (retval) {
-		ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
+		pr_err("zfcp: Registration with common I/O layer failed.\n");
 		goto out_ccw_register;
 	}
 
@@ -318,527 +208,88 @@ zfcp_module_init(void)
 
 	goto out;
 
- out_ccw_register:
+out_ccw_register:
 	misc_deregister(&zfcp_cfdc_misc);
- out_misc:
+out_misc:
 	fc_release_transport(zfcp_data.scsi_transport_template);
- out_transport:
+out_transport:
 	kmem_cache_destroy(zfcp_data.gid_pn_cache);
- out_gid_cache:
+out_gid_cache:
 	kmem_cache_destroy(zfcp_data.sr_buffer_cache);
- out_sr_cache:
+out_sr_cache:
 	kmem_cache_destroy(zfcp_data.fsf_req_qtcb_cache);
- out:
+out:
 	return retval;
 }
 
-/*
- * function:    zfcp_cfdc_dev_ioctl
- *
- * purpose:     Handle control file upload/download transaction via IOCTL
- *		interface
- *
- * returns:     0           - Operation completed successfuly
- *              -ENOTTY     - Unknown IOCTL command
- *              -EINVAL     - Invalid sense data record
- *              -ENXIO      - The FCP adapter is not available
- *              -EOPNOTSUPP - The FCP adapter does not have CFDC support
- *              -ENOMEM     - Insufficient memory
- *              -EFAULT     - User space memory I/O operation fault
- *              -EPERM      - Cannot create or queue FSF request or create SBALs
- *              -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
- */
-static long
-zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
-		    unsigned long buffer)
-{
-	struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
-	struct zfcp_adapter *adapter = NULL;
-	struct zfcp_fsf_req *fsf_req = NULL;
-	struct zfcp_sg_list *sg_list = NULL;
-	u32 fsf_command, option;
-	char *bus_id = NULL;
-	int retval = 0;
-
-	sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
-	if (sense_data == NULL) {
-		retval = -ENOMEM;
-		goto out;
-	}
-
-	sg_list = kzalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
-	if (sg_list == NULL) {
-		retval = -ENOMEM;
-		goto out;
-	}
-
-	if (command != ZFCP_CFDC_IOC) {
-		ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
-		retval = -ENOTTY;
-		goto out;
-	}
-
-	if ((sense_data_user = (void __user *) buffer) == NULL) {
-		ZFCP_LOG_INFO("sense data record is required\n");
-		retval = -EINVAL;
-		goto out;
-	}
-
-	retval = copy_from_user(sense_data, sense_data_user,
-				sizeof(struct zfcp_cfdc_sense_data));
-	if (retval) {
-		retval = -EFAULT;
-		goto out;
-	}
-
-	if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
-		ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
-			      ZFCP_CFDC_SIGNATURE);
-		retval = -EINVAL;
-		goto out;
-	}
-
-	switch (sense_data->command) {
-
-	case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
-		fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
-		option = FSF_CFDC_OPTION_NORMAL_MODE;
-		break;
-
-	case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
-		fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
-		option = FSF_CFDC_OPTION_FORCE;
-		break;
-
-	case ZFCP_CFDC_CMND_FULL_ACCESS:
-		fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
-		option = FSF_CFDC_OPTION_FULL_ACCESS;
-		break;
-
-	case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
-		fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
-		option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
-		break;
-
-	case ZFCP_CFDC_CMND_UPLOAD:
-		fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
-		option = 0;
-		break;
-
-	default:
-		ZFCP_LOG_INFO("invalid command code 0x%08x\n",
-			      sense_data->command);
-		retval = -EINVAL;
-		goto out;
-	}
-
-	bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
-	if (bus_id == NULL) {
-		retval = -ENOMEM;
-		goto out;
-	}
-	snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
-		(sense_data->devno >> 24),
-		(sense_data->devno >> 16) & 0xFF,
-		(sense_data->devno & 0xFFFF));
-
-	read_lock_irq(&zfcp_data.config_lock);
-	adapter = zfcp_get_adapter_by_busid(bus_id);
-	if (adapter)
-		zfcp_adapter_get(adapter);
-	read_unlock_irq(&zfcp_data.config_lock);
-
-	kfree(bus_id);
-
-	if (adapter == NULL) {
-		ZFCP_LOG_INFO("invalid adapter\n");
-		retval = -ENXIO;
-		goto out;
-	}
-
-	if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
-		retval = zfcp_sg_list_alloc(sg_list,
-					    ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
-		if (retval) {
-			retval = -ENOMEM;
-			goto out;
-		}
-	}
-
-	if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
-	    (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
-		retval = zfcp_sg_list_copy_from_user(
-			sg_list, &sense_data_user->control_file,
-			ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
-		if (retval) {
-			retval = -EFAULT;
-			goto out;
-		}
-	}
-
-	retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
-				       option, sg_list);
-	if (retval)
-		goto out;
-
-	if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
-	    (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
-		retval = -ENXIO;
-		goto out;
-	}
-
-	sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
-	memcpy(&sense_data->fsf_status_qual,
-	       &fsf_req->qtcb->header.fsf_status_qual,
-	       sizeof(union fsf_status_qual));
-	memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
-
-	retval = copy_to_user(sense_data_user, sense_data,
-		sizeof(struct zfcp_cfdc_sense_data));
-	if (retval) {
-		retval = -EFAULT;
-		goto out;
-	}
-
-	if (sense_data->command & ZFCP_CFDC_UPLOAD) {
-		retval = zfcp_sg_list_copy_to_user(
-			&sense_data_user->control_file, sg_list,
-			ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
-		if (retval) {
-			retval = -EFAULT;
-			goto out;
-		}
-	}
-
- out:
-	if (fsf_req != NULL)
-		zfcp_fsf_req_free(fsf_req);
-
-	if ((adapter != NULL) && (retval != -ENXIO))
-		zfcp_adapter_put(adapter);
-
-	if (sg_list != NULL) {
-		zfcp_sg_list_free(sg_list);
-		kfree(sg_list);
-	}
-
-	kfree(sense_data);
-
-	return retval;
-}
-
-
-/**
- * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
- * @sg_list: structure describing a scatter gather list
- * @size: size of scatter-gather list
- * Return: 0 on success, else -ENOMEM
- *
- * In sg_list->sg a pointer to the created scatter-gather list is returned,
- * or NULL if we run out of memory. sg_list->count specifies the number of
- * elements of the scatter-gather list. The maximum size of a single element
- * in the scatter-gather list is PAGE_SIZE.
- */
-static int
-zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
-{
-	struct scatterlist *sg;
-	unsigned int i;
-	int retval = 0;
-	void *address;
-
-	BUG_ON(sg_list == NULL);
-
-	sg_list->count = size >> PAGE_SHIFT;
-	if (size & ~PAGE_MASK)
-		sg_list->count++;
-	sg_list->sg = kcalloc(sg_list->count, sizeof(struct scatterlist),
-			      GFP_KERNEL);
-	if (sg_list->sg == NULL) {
-		sg_list->count = 0;
-		retval = -ENOMEM;
-		goto out;
-	}
-	sg_init_table(sg_list->sg, sg_list->count);
-
-	for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
-		address = (void *) get_zeroed_page(GFP_KERNEL);
-		if (address == NULL) {
-			sg_list->count = i;
-			zfcp_sg_list_free(sg_list);
-			retval = -ENOMEM;
-			goto out;
-		}
-		zfcp_address_to_sg(address, sg, min(size, PAGE_SIZE));
-		size -= sg->length;
-	}
-
- out:
-	return retval;
-}
-
-
-/**
- * zfcp_sg_list_free - free memory of a scatter-gather list
- * @sg_list: structure describing a scatter-gather list
- *
- * Memory for each element in the scatter-gather list is freed.
- * Finally sg_list->sg is freed itself and sg_list->count is reset.
- */
-static void
-zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
-{
-	struct scatterlist *sg;
-	unsigned int i;
-
-	BUG_ON(sg_list == NULL);
-
-	for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
-		free_page((unsigned long) zfcp_sg_to_address(sg));
-
-	sg_list->count = 0;
-	kfree(sg_list->sg);
-}
-
-/**
- * zfcp_sg_size - determine size of a scatter-gather list
- * @sg: array of (struct scatterlist)
- * @sg_count: elements in array
- * Return: size of entire scatter-gather list
- */
-static size_t zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
-{
-	unsigned int i;
-	struct scatterlist *p;
-	size_t size;
-
-	size = 0;
-	for (i = 0, p = sg; i < sg_count; i++, p++) {
-		BUG_ON(p == NULL);
-		size += p->length;
-	}
-
-	return size;
-}
-
-
-/**
- * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
- * @sg_list: structure describing a scatter-gather list
- * @user_buffer: pointer to buffer in user space
- * @size: number of bytes to be copied
- * Return: 0 on success, -EFAULT if copy_from_user fails.
- */
-static int
-zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
-			    void __user *user_buffer,
-                            size_t size)
-{
-	struct scatterlist *sg;
-	unsigned int length;
-	void *zfcp_buffer;
-	int retval = 0;
-
-	BUG_ON(sg_list == NULL);
-
-	if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
-		return -EFAULT;
-
-	for (sg = sg_list->sg; size > 0; sg++) {
-		length = min((unsigned int)size, sg->length);
-		zfcp_buffer = zfcp_sg_to_address(sg);
-		if (copy_from_user(zfcp_buffer, user_buffer, length)) {
-			retval = -EFAULT;
-			goto out;
-		}
-		user_buffer += length;
-		size -= length;
-	}
-
- out:
-	return retval;
-}
-
-
-/**
- * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
- * @user_buffer: pointer to buffer in user space
- * @sg_list: structure describing a scatter-gather list
- * @size: number of bytes to be copied
- * Return: 0 on success, -EFAULT if copy_to_user fails
- */
-static int
-zfcp_sg_list_copy_to_user(void __user  *user_buffer,
-			  struct zfcp_sg_list *sg_list,
-                          size_t size)
-{
-	struct scatterlist *sg;
-	unsigned int length;
-	void *zfcp_buffer;
-	int retval = 0;
-
-	BUG_ON(sg_list == NULL);
-
-	if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
-		return -EFAULT;
-
-	for (sg = sg_list->sg; size > 0; sg++) {
-		length = min((unsigned int) size, sg->length);
-		zfcp_buffer = zfcp_sg_to_address(sg);
-		if (copy_to_user(user_buffer, zfcp_buffer, length)) {
-			retval = -EFAULT;
-			goto out;
-		}
-		user_buffer += length;
-		size -= length;
-	}
-
- out:
-	return retval;
-}
-
-
-#undef ZFCP_LOG_AREA
-
-/****************************************************************/
-/****** Functions for configuration/set-up of structures ********/
-/****************************************************************/
-
-#define ZFCP_LOG_AREA			ZFCP_LOG_AREA_CONFIG
+module_init(zfcp_module_init);
 
 /**
  * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
  * @port: pointer to port to search for unit
  * @fcp_lun: FCP LUN to search for
- * Traverse list of all units of a port and return pointer to a unit
- * with the given FCP LUN.
+ *
+ * Returns: pointer to zfcp_unit or NULL
  */
-struct zfcp_unit *
-zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
+struct zfcp_unit *zfcp_get_unit_by_lun(struct zfcp_port *port,
+				       fcp_lun_t fcp_lun)
 {
 	struct zfcp_unit *unit;
-	int found = 0;
 
-	list_for_each_entry(unit, &port->unit_list_head, list) {
+	list_for_each_entry(unit, &port->unit_list_head, list)
 		if ((unit->fcp_lun == fcp_lun) &&
-		    !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
-		{
-			found = 1;
-			break;
-		}
-	}
-	return found ? unit : NULL;
+		    !(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_REMOVE))
+		    return unit;
+	return NULL;
 }
 
 /**
  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
  * @adapter: pointer to adapter to search for port
  * @wwpn: wwpn to search for
- * Traverse list of all ports of an adapter and return pointer to a port
- * with the given wwpn.
- */
-struct zfcp_port *
-zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
-{
-	struct zfcp_port *port;
-	int found = 0;
-
-	list_for_each_entry(port, &adapter->port_list_head, list) {
-		if ((port->wwpn == wwpn) &&
-		    !(atomic_read(&port->status) &
-		      (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
-			found = 1;
-			break;
-		}
-	}
-	return found ? port : NULL;
-}
-
-/**
- * zfcp_get_port_by_did - find port in port list of adapter by d_id
- * @adapter: pointer to adapter to search for port
- * @d_id: d_id to search for
- * Traverse list of all ports of an adapter and return pointer to a port
- * with the given d_id.
+ *
+ * Returns: pointer to zfcp_port or NULL
  */
-struct zfcp_port *
-zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
+struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter,
+					wwn_t wwpn)
 {
 	struct zfcp_port *port;
-	int found = 0;
 
-	list_for_each_entry(port, &adapter->port_list_head, list) {
-		if ((port->d_id == d_id) &&
-		    !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
-		{
-			found = 1;
-			break;
-		}
-	}
-	return found ? port : NULL;
+	list_for_each_entry(port, &adapter->port_list_head, list)
+		if ((port->wwpn == wwpn) && !(atomic_read(&port->status) &
+		      (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE)))
+			return port;
+	return NULL;
 }
 
-/**
- * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
- * @bus_id: bus_id to search for
- * Traverse list of all adapters and return pointer to an adapter
- * with the given bus_id.
- */
-struct zfcp_adapter *
-zfcp_get_adapter_by_busid(char *bus_id)
+static void zfcp_sysfs_unit_release(struct device *dev)
 {
-	struct zfcp_adapter *adapter;
-	int found = 0;
-
-	list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
-		if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
-			     BUS_ID_SIZE) == 0) &&
-		    !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
-				      &adapter->status)){
-			found = 1;
-			break;
-		}
-	}
-	return found ? adapter : NULL;
+	kfree(container_of(dev, struct zfcp_unit, sysfs_device));
 }
 
 /**
  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
  * @port: pointer to port where unit is added
  * @fcp_lun: FCP LUN of unit to be enqueued
- * Return: pointer to enqueued unit on success, NULL on error
+ * Returns: pointer to enqueued unit on success, ERR_PTR on error
  * Locks: config_sema must be held to serialize changes to the unit list
  *
  * Sets up some unit internal structures and creates sysfs entry.
  */
-struct zfcp_unit *
-zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
+struct zfcp_unit *zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
 {
 	struct zfcp_unit *unit;
 
-	/*
-	 * check that there is no unit with this FCP_LUN already in list
-	 * and enqueue it.
-	 * Note: Unlike for the adapter and the port, this is an error
-	 */
-	read_lock_irq(&zfcp_data.config_lock);
-	unit = zfcp_get_unit_by_lun(port, fcp_lun);
-	read_unlock_irq(&zfcp_data.config_lock);
-	if (unit)
-		return NULL;
-
-	unit = kzalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
+	unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL);
 	if (!unit)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
-	/* initialise reference count stuff */
 	atomic_set(&unit->refcount, 0);
 	init_waitqueue_head(&unit->remove_wq);
 
 	unit->port = port;
 	unit->fcp_lun = fcp_lun;
 
-	/* setup for sysfs registration */
 	snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
 	unit->sysfs_device.parent = &port->sysfs_device;
 	unit->sysfs_device.release = zfcp_sysfs_unit_release;
@@ -847,14 +298,28 @@ zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
 	/* mark unit unusable as long as sysfs registration is not complete */
 	atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 
-	if (device_register(&unit->sysfs_device)) {
-		kfree(unit);
-		return NULL;
+	spin_lock_init(&unit->latencies.lock);
+	unit->latencies.write.channel.min = 0xFFFFFFFF;
+	unit->latencies.write.fabric.min = 0xFFFFFFFF;
+	unit->latencies.read.channel.min = 0xFFFFFFFF;
+	unit->latencies.read.fabric.min = 0xFFFFFFFF;
+	unit->latencies.cmd.channel.min = 0xFFFFFFFF;
+	unit->latencies.cmd.fabric.min = 0xFFFFFFFF;
+
+	read_lock_irq(&zfcp_data.config_lock);
+	if (zfcp_get_unit_by_lun(port, fcp_lun)) {
+		read_unlock_irq(&zfcp_data.config_lock);
+		goto err_out_free;
 	}
+	read_unlock_irq(&zfcp_data.config_lock);
 
-	if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
+	if (device_register(&unit->sysfs_device))
+		goto err_out_free;
+
+	if (sysfs_create_group(&unit->sysfs_device.kobj,
+			       &zfcp_sysfs_unit_attrs)) {
 		device_unregister(&unit->sysfs_device);
-		return NULL;
+		return ERR_PTR(-EIO);
 	}
 
 	zfcp_unit_get(unit);
@@ -864,16 +329,27 @@ zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
 	list_add_tail(&unit->list, &port->unit_list_head);
 	atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
 	atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
+
 	write_unlock_irq(&zfcp_data.config_lock);
 
 	port->units++;
 	zfcp_port_get(port);
 
 	return unit;
+
+err_out_free:
+	kfree(unit);
+	return ERR_PTR(-EINVAL);
 }
 
-void
-zfcp_unit_dequeue(struct zfcp_unit *unit)
+/**
+ * zfcp_unit_dequeue - dequeue unit
+ * @unit: pointer to zfcp_unit
+ *
+ * waits until all work is done on unit and removes it then from the unit->list
+ * of the associated port.
+ */
+void zfcp_unit_dequeue(struct zfcp_unit *unit)
 {
 	zfcp_unit_wait(unit);
 	write_lock_irq(&zfcp_data.config_lock);
@@ -881,68 +357,51 @@ zfcp_unit_dequeue(struct zfcp_unit *unit)
 	write_unlock_irq(&zfcp_data.config_lock);
 	unit->port->units--;
 	zfcp_port_put(unit->port);
-	zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
+	sysfs_remove_group(&unit->sysfs_device.kobj, &zfcp_sysfs_unit_attrs);
 	device_unregister(&unit->sysfs_device);
 }
 
-/*
- * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
- * commands.
- * It also genrates fcp-nameserver request/response buffer and unsolicited
- * status read fsf_req buffers.
- *
- * locks:       must only be called with zfcp_data.config_sema taken
- */
-static int
-zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
+static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
 {
+	/* must only be called with zfcp_data.config_sema taken */
 	adapter->pool.fsf_req_erp =
-		mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
-					 zfcp_data.fsf_req_qtcb_cache);
+		mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache);
 	if (!adapter->pool.fsf_req_erp)
 		return -ENOMEM;
 
 	adapter->pool.fsf_req_scsi =
-		mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_SCSI_NR,
-					 zfcp_data.fsf_req_qtcb_cache);
+		mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache);
 	if (!adapter->pool.fsf_req_scsi)
 		return -ENOMEM;
 
 	adapter->pool.fsf_req_abort =
-		mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ABORT_NR,
-					 zfcp_data.fsf_req_qtcb_cache);
+		mempool_create_slab_pool(1, zfcp_data.fsf_req_qtcb_cache);
 	if (!adapter->pool.fsf_req_abort)
 		return -ENOMEM;
 
 	adapter->pool.fsf_req_status_read =
-		mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
+		mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
 					    sizeof(struct zfcp_fsf_req));
 	if (!adapter->pool.fsf_req_status_read)
 		return -ENOMEM;
 
 	adapter->pool.data_status_read =
-		mempool_create_slab_pool(ZFCP_POOL_STATUS_READ_NR,
+		mempool_create_slab_pool(FSF_STATUS_READS_RECOM,
 					 zfcp_data.sr_buffer_cache);
 	if (!adapter->pool.data_status_read)
 		return -ENOMEM;
 
 	adapter->pool.data_gid_pn =
-		mempool_create_slab_pool(ZFCP_POOL_DATA_GID_PN_NR,
-					 zfcp_data.gid_pn_cache);
+		mempool_create_slab_pool(1, zfcp_data.gid_pn_cache);
 	if (!adapter->pool.data_gid_pn)
 		return -ENOMEM;
 
 	return 0;
 }
 
-/**
- * zfcp_free_low_mem_buffers - free memory pools of an adapter
- * @adapter: pointer to zfcp_adapter for which memory pools should be freed
- * locking:  zfcp_data.config_sema must be held
- */
-static void
-zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
+static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
 {
+	/* zfcp_data.config_sema must be held */
 	if (adapter->pool.fsf_req_erp)
 		mempool_destroy(adapter->pool.fsf_req_erp);
 	if (adapter->pool.fsf_req_scsi)
@@ -962,20 +421,61 @@ static void zfcp_dummy_release(struct device *dev)
 	return;
 }
 
-/*
+/**
+ * zfcp_status_read_refill - refill the long running status_read_requests
+ * @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
+ *
+ * Returns: 0 on success, 1 otherwise
+ *
+ * if there are 16 or more status_read requests missing an adapter_reopen
+ * is triggered
+ */
+int zfcp_status_read_refill(struct zfcp_adapter *adapter)
+{
+	while (atomic_read(&adapter->stat_miss) > 0)
+		if (zfcp_fsf_status_read(adapter)) {
+			if (atomic_read(&adapter->stat_miss) >= 16) {
+				zfcp_erp_adapter_reopen(adapter, 0, 103, NULL);
+				return 1;
+			}
+			break;
+		} else
+			atomic_dec(&adapter->stat_miss);
+	return 0;
+}
+
+static void _zfcp_status_read_scheduler(struct work_struct *work)
+{
+	zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
+					     stat_work));
+}
+
+static int zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
+{
+	struct zfcp_port *port;
+
+	port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
+				 ZFCP_DID_DIRECTORY_SERVICE);
+	if (IS_ERR(port))
+		return PTR_ERR(port);
+	zfcp_port_put(port);
+
+	return 0;
+}
+
+/**
+ * zfcp_adapter_enqueue - enqueue a new adapter to the list
+ * @ccw_device: pointer to the struct cc_device
+ *
+ * Returns:	0             if a new adapter was successfully enqueued
+ *		-ENOMEM       if alloc failed
  * Enqueues an adapter at the end of the adapter list in the driver data.
  * All adapter internal structures are set up.
  * Proc-fs entries are also created.
- *
- * returns:	0             if a new adapter was successfully enqueued
- *              ZFCP_KNOWN    if an adapter with this devno was already present
- *		-ENOMEM       if alloc failed
  * locks:	config_sema must be held to serialise changes to the adapter list
  */
-struct zfcp_adapter *
-zfcp_adapter_enqueue(struct ccw_device *ccw_device)
+int zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 {
-	int retval = 0;
 	struct zfcp_adapter *adapter;
 
 	/*
@@ -983,85 +483,58 @@ zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 	 * are protected by the config_sema, which must be held to get here
 	 */
 
-	/* try to allocate new adapter data structure (zeroed) */
-	adapter = kzalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
-	if (!adapter) {
-		ZFCP_LOG_INFO("error: allocation of base adapter "
-			      "structure failed\n");
-		goto out;
-	}
+	adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
+	if (!adapter)
+		return -ENOMEM;
 
 	ccw_device->handler = NULL;
-
-	/* save ccw_device pointer */
 	adapter->ccw_device = ccw_device;
+	atomic_set(&adapter->refcount, 0);
 
-	retval = zfcp_qdio_allocate_queues(adapter);
-	if (retval)
-		goto queues_alloc_failed;
-
-	retval = zfcp_qdio_allocate(adapter);
-	if (retval)
+	if (zfcp_qdio_allocate(adapter))
 		goto qdio_allocate_failed;
 
-	retval = zfcp_allocate_low_mem_buffers(adapter);
-	if (retval) {
-		ZFCP_LOG_INFO("error: pool allocation failed\n");
+	if (zfcp_allocate_low_mem_buffers(adapter))
 		goto failed_low_mem_buffers;
-	}
 
-	/* initialise reference count stuff */
-	atomic_set(&adapter->refcount, 0);
+	if (zfcp_reqlist_alloc(adapter))
+		goto failed_low_mem_buffers;
+
+	if (zfcp_adapter_debug_register(adapter))
+		goto debug_register_failed;
+
 	init_waitqueue_head(&adapter->remove_wq);
+	init_waitqueue_head(&adapter->erp_thread_wqh);
+	init_waitqueue_head(&adapter->erp_done_wqh);
 
-	/* initialise list of ports */
 	INIT_LIST_HEAD(&adapter->port_list_head);
-
-	/* initialise list of ports to be removed */
 	INIT_LIST_HEAD(&adapter->port_remove_lh);
+	INIT_LIST_HEAD(&adapter->erp_ready_head);
+	INIT_LIST_HEAD(&adapter->erp_running_head);
 
-	/* initialize list of fsf requests */
 	spin_lock_init(&adapter->req_list_lock);
-	retval = zfcp_reqlist_alloc(adapter);
-	if (retval) {
-		ZFCP_LOG_INFO("request list initialization failed\n");
-		goto failed_low_mem_buffers;
-	}
-
-	/* initialize debug locks */
 
 	spin_lock_init(&adapter->hba_dbf_lock);
 	spin_lock_init(&adapter->san_dbf_lock);
 	spin_lock_init(&adapter->scsi_dbf_lock);
 	spin_lock_init(&adapter->rec_dbf_lock);
-
-	retval = zfcp_adapter_debug_register(adapter);
-	if (retval)
-		goto debug_register_failed;
-
-	/* initialize error recovery stuff */
+	spin_lock_init(&adapter->req_q.lock);
 
 	rwlock_init(&adapter->erp_lock);
-	sema_init(&adapter->erp_ready_sem, 0);
-	INIT_LIST_HEAD(&adapter->erp_ready_head);
-	INIT_LIST_HEAD(&adapter->erp_running_head);
-
-	/* initialize abort lock */
 	rwlock_init(&adapter->abort_lock);
 
-	/* initialise some erp stuff */
-	init_waitqueue_head(&adapter->erp_thread_wqh);
-	init_waitqueue_head(&adapter->erp_done_wqh);
+	sema_init(&adapter->erp_ready_sem, 0);
 
-	/* initialize lock of associated request queue */
-	rwlock_init(&adapter->request_queue.queue_lock);
+	INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
+	INIT_WORK(&adapter->scan_work, _zfcp_scan_ports_later);
 
 	/* mark adapter unusable as long as sysfs registration is not complete */
 	atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 
 	dev_set_drvdata(&ccw_device->dev, adapter);
 
-	if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
+	if (sysfs_create_group(&ccw_device->dev.kobj,
+			       &zfcp_sysfs_adapter_attrs))
 		goto sysfs_failed;
 
 	adapter->generic_services.parent = &adapter->ccw_device->dev;
@@ -1072,7 +545,6 @@ zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 	if (device_register(&adapter->generic_services))
 		goto generic_services_failed;
 
-	/* put allocated adapter at list tail */
 	write_lock_irq(&zfcp_data.config_lock);
 	atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 	list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
@@ -1080,57 +552,49 @@ zfcp_adapter_enqueue(struct ccw_device *ccw_device)
 
 	zfcp_data.adapters++;
 
-	goto out;
+	zfcp_nameserver_enqueue(adapter);
+
+	return 0;
 
- generic_services_failed:
-	zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
- sysfs_failed:
+generic_services_failed:
+	sysfs_remove_group(&ccw_device->dev.kobj,
+			   &zfcp_sysfs_adapter_attrs);
+sysfs_failed:
 	zfcp_adapter_debug_unregister(adapter);
- debug_register_failed:
+debug_register_failed:
 	dev_set_drvdata(&ccw_device->dev, NULL);
-	zfcp_reqlist_free(adapter);
- failed_low_mem_buffers:
+	kfree(adapter->req_list);
+failed_low_mem_buffers:
 	zfcp_free_low_mem_buffers(adapter);
-	if (qdio_free(ccw_device) != 0)
-		ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
-				zfcp_get_busid_by_adapter(adapter));
- qdio_allocate_failed:
-	zfcp_qdio_free_queues(adapter);
- queues_alloc_failed:
+qdio_allocate_failed:
+	zfcp_qdio_free(adapter);
 	kfree(adapter);
-	adapter = NULL;
- out:
-	return adapter;
+	return -ENOMEM;
 }
 
-/*
- * returns:	0 - struct zfcp_adapter  data structure successfully removed
- *		!0 - struct zfcp_adapter  data structure could not be removed
- *			(e.g. still used)
+/**
+ * zfcp_adapter_dequeue - remove the adapter from the resource list
+ * @adapter: pointer to struct zfcp_adapter which should be removed
  * locks:	adapter list write lock is assumed to be held by caller
  */
-void
-zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
+void zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
 {
 	int retval = 0;
 	unsigned long flags;
 
+	cancel_work_sync(&adapter->scan_work);
+	cancel_work_sync(&adapter->stat_work);
 	zfcp_adapter_scsi_unregister(adapter);
 	device_unregister(&adapter->generic_services);
-	zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
+	sysfs_remove_group(&adapter->ccw_device->dev.kobj,
+			   &zfcp_sysfs_adapter_attrs);
 	dev_set_drvdata(&adapter->ccw_device->dev, NULL);
 	/* sanity check: no pending FSF requests */
 	spin_lock_irqsave(&adapter->req_list_lock, flags);
 	retval = zfcp_reqlist_isempty(adapter);
 	spin_unlock_irqrestore(&adapter->req_list_lock, flags);
-	if (!retval) {
-		ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
-				"%i requests outstanding\n",
-				zfcp_get_busid_by_adapter(adapter), adapter,
-				atomic_read(&adapter->reqs_active));
-		retval = -EBUSY;
-		goto out;
-	}
+	if (!retval)
+		return;
 
 	zfcp_adapter_debug_unregister(adapter);
 
@@ -1142,26 +606,18 @@ zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
 	/* decrease number of adapters in list */
 	zfcp_data.adapters--;
 
-	ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
-		       "%i adapters still in list\n",
-		       zfcp_get_busid_by_adapter(adapter),
-		       adapter, zfcp_data.adapters);
-
-	retval = qdio_free(adapter->ccw_device);
-	if (retval)
-		ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
-				zfcp_get_busid_by_adapter(adapter));
+	zfcp_qdio_free(adapter);
 
 	zfcp_free_low_mem_buffers(adapter);
-	/* free memory of adapter data structure and queues */
-	zfcp_qdio_free_queues(adapter);
-	zfcp_reqlist_free(adapter);
+	kfree(adapter->req_list);
 	kfree(adapter->fc_stats);
 	kfree(adapter->stats_reset_data);
-	ZFCP_LOG_TRACE("freeing adapter structure\n");
 	kfree(adapter);
- out:
-	return;
+}
+
+static void zfcp_sysfs_port_release(struct device *dev)
+{
+	kfree(container_of(dev, struct zfcp_port, sysfs_device));
 }
 
 /**
@@ -1170,98 +626,90 @@ zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
  * @wwpn: WWPN of the remote port to be enqueued
  * @status: initial status for the port
  * @d_id: destination id of the remote port to be enqueued
- * Return: pointer to enqueued port on success, NULL on error
+ * Returns: pointer to enqueued port on success, ERR_PTR on error
  * Locks: config_sema must be held to serialize changes to the port list
  *
  * All port internal structures are set up and the sysfs entry is generated.
  * d_id is used to enqueue ports with a well known address like the Directory
  * Service for nameserver lookup.
  */
-struct zfcp_port *
-zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
-		  u32 d_id)
+struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn,
+				     u32 status, u32 d_id)
 {
 	struct zfcp_port *port;
-	int check_wwpn;
-
-	check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
-	/*
-	 * check that there is no port with this WWPN already in list
-	 */
-	if (check_wwpn) {
-		read_lock_irq(&zfcp_data.config_lock);
-		port = zfcp_get_port_by_wwpn(adapter, wwpn);
-		read_unlock_irq(&zfcp_data.config_lock);
-		if (port)
-			return NULL;
-	}
+	int retval;
+	char *bus_id;
 
-	port = kzalloc(sizeof (struct zfcp_port), GFP_KERNEL);
+	port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
 	if (!port)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
-	/* initialise reference count stuff */
-	atomic_set(&port->refcount, 0);
 	init_waitqueue_head(&port->remove_wq);
 
 	INIT_LIST_HEAD(&port->unit_list_head);
 	INIT_LIST_HEAD(&port->unit_remove_lh);
 
 	port->adapter = adapter;
+	port->d_id = d_id;
+	port->wwpn = wwpn;
 
-	if (check_wwpn)
-		port->wwpn = wwpn;
-
-	atomic_set_mask(status, &port->status);
+	/* mark port unusable as long as sysfs registration is not complete */
+	atomic_set_mask(status | ZFCP_STATUS_COMMON_REMOVE, &port->status);
+	atomic_set(&port->refcount, 0);
 
-	/* setup for sysfs registration */
 	if (status & ZFCP_STATUS_PORT_WKA) {
 		switch (d_id) {
 		case ZFCP_DID_DIRECTORY_SERVICE:
-			snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
-				 "directory");
+			bus_id = "directory";
 			break;
 		case ZFCP_DID_MANAGEMENT_SERVICE:
-			snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
-				 "management");
+			bus_id = "management";
 			break;
 		case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
-			snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
-				 "key_distribution");
+			bus_id = "key_distribution";
 			break;
 		case ZFCP_DID_ALIAS_SERVICE:
-			snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
-				 "alias");
+			bus_id = "alias";
 			break;
 		case ZFCP_DID_TIME_SERVICE:
-			snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
-				 "time");
+			bus_id = "time";
 			break;
 		default:
 			kfree(port);
-			return NULL;
+			return ERR_PTR(-EINVAL);
 		}
-		port->d_id = d_id;
+		snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE, "%s", bus_id);
 		port->sysfs_device.parent = &adapter->generic_services;
 	} else {
 		snprintf(port->sysfs_device.bus_id,
 			 BUS_ID_SIZE, "0x%016llx", wwpn);
 		port->sysfs_device.parent = &adapter->ccw_device->dev;
 	}
+
 	port->sysfs_device.release = zfcp_sysfs_port_release;
 	dev_set_drvdata(&port->sysfs_device, port);
 
-	/* mark port unusable as long as sysfs registration is not complete */
-	atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
+	read_lock_irq(&zfcp_data.config_lock);
+	if (!(status & ZFCP_STATUS_PORT_NO_WWPN))
+		if (zfcp_get_port_by_wwpn(adapter, wwpn)) {
+			read_unlock_irq(&zfcp_data.config_lock);
+			goto err_out_free;
+		}
+	read_unlock_irq(&zfcp_data.config_lock);
 
-	if (device_register(&port->sysfs_device)) {
-		kfree(port);
-		return NULL;
-	}
+	if (device_register(&port->sysfs_device))
+		goto err_out_free;
+
+	if (status & ZFCP_STATUS_PORT_WKA)
+		retval = sysfs_create_group(&port->sysfs_device.kobj,
+					    &zfcp_sysfs_ns_port_attrs);
+	else
+		retval = sysfs_create_group(&port->sysfs_device.kobj,
+					    &zfcp_sysfs_port_attrs);
 
-	if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
+	if (retval) {
 		device_unregister(&port->sysfs_device);
-		return NULL;
+		goto err_out;
 	}
 
 	zfcp_port_get(port);
@@ -1274,15 +722,23 @@ zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
 		if (!adapter->nameserver_port)
 			adapter->nameserver_port = port;
 	adapter->ports++;
+
 	write_unlock_irq(&zfcp_data.config_lock);
 
 	zfcp_adapter_get(adapter);
-
 	return port;
+
+err_out_free:
+	kfree(port);
+err_out:
+	return ERR_PTR(-EINVAL);
 }
 
-void
-zfcp_port_dequeue(struct zfcp_port *port)
+/**
+ * zfcp_port_dequeue - dequeues a port from the port list of the adapter
+ * @port: pointer to struct zfcp_port which should be removed
+ */
+void zfcp_port_dequeue(struct zfcp_port *port)
 {
 	zfcp_port_wait(port);
 	write_lock_irq(&zfcp_data.config_lock);
@@ -1293,546 +749,53 @@ zfcp_port_dequeue(struct zfcp_port *port)
 		fc_remote_port_delete(port->rport);
 	port->rport = NULL;
 	zfcp_adapter_put(port->adapter);
-	zfcp_sysfs_port_remove_files(&port->sysfs_device,
-				     atomic_read(&port->status));
-	device_unregister(&port->sysfs_device);
-}
-
-/* Enqueues a nameserver port */
-int
-zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
-{
-	struct zfcp_port *port;
-
-	port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
-				 ZFCP_DID_DIRECTORY_SERVICE);
-	if (!port) {
-		ZFCP_LOG_INFO("error: enqueue of nameserver port for "
-			      "adapter %s failed\n",
-			      zfcp_get_busid_by_adapter(adapter));
-		return -ENXIO;
-	}
-	zfcp_port_put(port);
-
-	return 0;
-}
-
-#undef ZFCP_LOG_AREA
-
-/****************************************************************/
-/******* Fibre Channel Standard related Functions  **************/
-/****************************************************************/
-
-#define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FC
-
-static void zfcp_fsf_incoming_els_rscn(struct zfcp_fsf_req *fsf_req)
-{
-	struct fsf_status_read_buffer *status_buffer = (void*)fsf_req->data;
-	struct zfcp_adapter *adapter = fsf_req->adapter;
-	struct fcp_rscn_head *fcp_rscn_head;
-	struct fcp_rscn_element *fcp_rscn_element;
-	struct zfcp_port *port;
-	u16 i;
-	u16 no_entries;
-	u32 range_mask;
-	unsigned long flags;
-
-	fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
-	fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
-
-	/* see FC-FS */
-	no_entries = (fcp_rscn_head->payload_len / 4);
-
-	for (i = 1; i < no_entries; i++) {
-		/* skip head and start with 1st element */
-		fcp_rscn_element++;
-		switch (fcp_rscn_element->addr_format) {
-		case ZFCP_PORT_ADDRESS:
-			range_mask = ZFCP_PORTS_RANGE_PORT;
-			break;
-		case ZFCP_AREA_ADDRESS:
-			range_mask = ZFCP_PORTS_RANGE_AREA;
-			break;
-		case ZFCP_DOMAIN_ADDRESS:
-			range_mask = ZFCP_PORTS_RANGE_DOMAIN;
-			break;
-		case ZFCP_FABRIC_ADDRESS:
-			range_mask = ZFCP_PORTS_RANGE_FABRIC;
-			break;
-		default:
-			ZFCP_LOG_INFO("incoming RSCN with unknown "
-				      "address format\n");
-			continue;
-		}
-		read_lock_irqsave(&zfcp_data.config_lock, flags);
-		list_for_each_entry(port, &adapter->port_list_head, list) {
-			if (atomic_test_mask
-			    (ZFCP_STATUS_PORT_WKA, &port->status))
-				continue;
-			/* Do we know this port? If not skip it. */
-			if (!atomic_test_mask
-			    (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
-				ZFCP_LOG_INFO("incoming RSCN, trying to open "
-					      "port 0x%016Lx\n", port->wwpn);
-				zfcp_erp_port_reopen(port,
-						     ZFCP_STATUS_COMMON_ERP_FAILED,
-						     82, fsf_req);
-				continue;
-			}
-
-			/*
-			 * FIXME: race: d_id might being invalidated
-			 * (...DID_DID reset)
-			 */
-			if ((port->d_id & range_mask)
-			    == (fcp_rscn_element->nport_did & range_mask)) {
-				ZFCP_LOG_TRACE("reopen did 0x%08x\n",
-					       fcp_rscn_element->nport_did);
-				/*
-				 * Unfortunately, an RSCN does not specify the
-				 * type of change a target underwent. We assume
-				 * that it makes sense to reopen the link.
-				 * FIXME: Shall we try to find out more about
-				 * the target and link state before closing it?
-				 * How to accomplish this? (nameserver?)
-				 * Where would such code be put in?
-				 * (inside or outside erp)
-				 */
-				ZFCP_LOG_INFO("incoming RSCN, trying to open "
-					      "port 0x%016Lx\n", port->wwpn);
-				zfcp_test_link(port);
-			}
-		}
-		read_unlock_irqrestore(&zfcp_data.config_lock, flags);
-	}
-}
-
-static void zfcp_fsf_incoming_els_plogi(struct zfcp_fsf_req *fsf_req)
-{
-	struct fsf_status_read_buffer *status_buffer = (void*)fsf_req->data;
-	struct zfcp_adapter *adapter = fsf_req->adapter;
-	struct fsf_plogi *els_plogi;
-	struct zfcp_port *port;
-	unsigned long flags;
-
-	els_plogi = (struct fsf_plogi *) status_buffer->payload;
-	read_lock_irqsave(&zfcp_data.config_lock, flags);
-	list_for_each_entry(port, &adapter->port_list_head, list) {
-		if (port->wwpn == (*(wwn_t *) &els_plogi->serv_param.wwpn))
-			break;
-	}
-	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
-
-	if (!port || (port->wwpn != (*(wwn_t *) &els_plogi->serv_param.wwpn))) {
-		ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
-			       "with d_id 0x%06x on adapter %s\n",
-			       status_buffer->d_id,
-			       zfcp_get_busid_by_adapter(adapter));
-	} else {
-		zfcp_erp_port_forced_reopen(port, 0, 83, fsf_req);
-	}
-}
-
-static void zfcp_fsf_incoming_els_logo(struct zfcp_fsf_req *fsf_req)
-{
-	struct fsf_status_read_buffer *status_buffer = (void*)fsf_req->data;
-	struct zfcp_adapter *adapter = fsf_req->adapter;
-	struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
-	struct zfcp_port *port;
-	unsigned long flags;
-
-	read_lock_irqsave(&zfcp_data.config_lock, flags);
-	list_for_each_entry(port, &adapter->port_list_head, list) {
-		if (port->wwpn == els_logo->nport_wwpn)
-			break;
-	}
-	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
-
-	if (!port || (port->wwpn != els_logo->nport_wwpn)) {
-		ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
-			       "with d_id 0x%06x on adapter %s\n",
-			       status_buffer->d_id,
-			       zfcp_get_busid_by_adapter(adapter));
-	} else {
-		zfcp_erp_port_forced_reopen(port, 0, 84, fsf_req);
-	}
-}
-
-static void
-zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
-			      struct fsf_status_read_buffer *status_buffer)
-{
-	ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
-			"for adapter %s\n", *(u32 *) (status_buffer->payload),
-			zfcp_get_busid_by_adapter(adapter));
-
-}
-
-void
-zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
-{
-	struct fsf_status_read_buffer *status_buffer;
-	u32 els_type;
-	struct zfcp_adapter *adapter;
-
-	status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
-	els_type = *(u32 *) (status_buffer->payload);
-	adapter = fsf_req->adapter;
-
-	zfcp_san_dbf_event_incoming_els(fsf_req);
-	if (els_type == LS_PLOGI)
-		zfcp_fsf_incoming_els_plogi(fsf_req);
-	else if (els_type == LS_LOGO)
-		zfcp_fsf_incoming_els_logo(fsf_req);
-	else if ((els_type & 0xffff0000) == LS_RSCN)
-		/* we are only concerned with the command, not the length */
-		zfcp_fsf_incoming_els_rscn(fsf_req);
-	else
-		zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
-}
-
-
-/**
- * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
- * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
- * @pool: pointer to mempool_t if non-null memory pool is used for allocation
- */
-static int
-zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
-{
-	struct zfcp_gid_pn_data *data;
-
-	if (pool != NULL) {
-		data = mempool_alloc(pool, GFP_ATOMIC);
-		if (likely(data != NULL)) {
-			data->ct.pool = pool;
-		}
-	} else {
-		data = kmem_cache_alloc(zfcp_data.gid_pn_cache, GFP_ATOMIC);
-	}
-
-        if (NULL == data)
-                return -ENOMEM;
-
-	memset(data, 0, sizeof(*data));
-	sg_init_table(&data->req , 1);
-	sg_init_table(&data->resp , 1);
-        data->ct.req = &data->req;
-        data->ct.resp = &data->resp;
-	data->ct.req_count = data->ct.resp_count = 1;
-	zfcp_address_to_sg(&data->ct_iu_req, &data->req, sizeof(struct ct_iu_gid_pn_req));
-        zfcp_address_to_sg(&data->ct_iu_resp, &data->resp, sizeof(struct ct_iu_gid_pn_resp));
-
-	*gid_pn = data;
-	return 0;
-}
-
-/**
- * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
- * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
- */
-static void zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
-{
-	if (gid_pn->ct.pool)
-		mempool_free(gid_pn, gid_pn->ct.pool);
+	if (atomic_read(&port->status) & ZFCP_STATUS_PORT_WKA)
+		sysfs_remove_group(&port->sysfs_device.kobj,
+				   &zfcp_sysfs_ns_port_attrs);
 	else
-		kmem_cache_free(zfcp_data.gid_pn_cache, gid_pn);
-}
-
-/**
- * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
- * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
- */
-int
-zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
-{
-	int ret;
-        struct ct_iu_gid_pn_req *ct_iu_req;
-        struct zfcp_gid_pn_data *gid_pn;
-        struct zfcp_adapter *adapter = erp_action->adapter;
-
-	ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
-	if (ret < 0) {
-		ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
-			      "request failed for adapter %s\n",
-			      zfcp_get_busid_by_adapter(adapter));
-		goto out;
-	}
-
-	/* setup nameserver request */
-        ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
-        ct_iu_req->header.revision = ZFCP_CT_REVISION;
-        ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
-        ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
-        ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
-        ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
-        ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
-	ct_iu_req->wwpn = erp_action->port->wwpn;
-
-        /* setup parameters for send generic command */
-        gid_pn->ct.port = adapter->nameserver_port;
-	gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
-	gid_pn->ct.handler_data = (unsigned long) gid_pn;
-        gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
-	gid_pn->port = erp_action->port;
-
-	ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
-			       erp_action);
-	if (ret) {
-		ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
-                              "failed for adapter %s\n",
-			      zfcp_get_busid_by_adapter(adapter));
-
-                zfcp_gid_pn_buffers_free(gid_pn);
-	}
-
- out:
-	return ret;
-}
-
-/**
- * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
- * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
- */
-static void zfcp_ns_gid_pn_handler(unsigned long data)
-{
-	struct zfcp_port *port;
-        struct zfcp_send_ct *ct;
-	struct ct_iu_gid_pn_req *ct_iu_req;
-	struct ct_iu_gid_pn_resp *ct_iu_resp;
-        struct zfcp_gid_pn_data *gid_pn;
-
-
-	gid_pn = (struct zfcp_gid_pn_data *) data;
-	port = gid_pn->port;
-        ct = &gid_pn->ct;
-	ct_iu_req = zfcp_sg_to_address(ct->req);
-	ct_iu_resp = zfcp_sg_to_address(ct->resp);
-
-	if (ct->status != 0)
-		goto failed;
-
-	if (zfcp_check_ct_response(&ct_iu_resp->header)) {
-		/* FIXME: do we need some specific erp entry points */
-		atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
-		goto failed;
-	}
-	/* paranoia */
-	if (ct_iu_req->wwpn != port->wwpn) {
-		ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
-				"lookup does not match expected wwpn 0x%016Lx "
-				"for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
-				zfcp_get_busid_by_port(port));
-		goto mismatch;
-	}
-
-	/* looks like a valid d_id */
-        port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
-	atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
-	ZFCP_LOG_DEBUG("adapter %s:  wwpn=0x%016Lx ---> d_id=0x%06x\n",
-		       zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
-	goto out;
-
- mismatch:
-	ZFCP_LOG_DEBUG("CT IUs do not match:\n");
-	ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
-		      sizeof(struct ct_iu_gid_pn_req));
-	ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
-		      sizeof(struct ct_iu_gid_pn_resp));
-
- failed:
-	ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
-			"0x%016Lx for adapter %s\n",
-			port->wwpn, zfcp_get_busid_by_port(port));
- out:
-        zfcp_gid_pn_buffers_free(gid_pn);
-	return;
+		sysfs_remove_group(&port->sysfs_device.kobj,
+				   &zfcp_sysfs_port_attrs);
+	device_unregister(&port->sysfs_device);
 }
 
-/* reject CT_IU reason codes acc. to FC-GS-4 */
-static const struct zfcp_rc_entry zfcp_ct_rc[] = {
-	{0x01, "invalid command code"},
-	{0x02, "invalid version level"},
-	{0x03, "logical error"},
-	{0x04, "invalid CT_IU size"},
-	{0x05, "logical busy"},
-	{0x07, "protocol error"},
-	{0x09, "unable to perform command request"},
-	{0x0b, "command not supported"},
-	{0x0d, "server not available"},
-	{0x0e, "session could not be established"},
-	{0xff, "vendor specific error"},
-	{0, NULL},
-};
-
-/* LS_RJT reason codes acc. to FC-FS */
-static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
-	{0x01, "invalid LS_Command code"},
-	{0x03, "logical error"},
-	{0x05, "logical busy"},
-	{0x07, "protocol error"},
-	{0x09, "unable to perform command request"},
-	{0x0b, "command not supported"},
-	{0x0e, "command already in progress"},
-	{0xff, "vendor specific error"},
-	{0, NULL},
-};
-
-/* reject reason codes according to FC-PH/FC-FS */
-static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
-	{0x01, "invalid D_ID"},
-	{0x02, "invalid S_ID"},
-	{0x03, "Nx_Port not available, temporary"},
-	{0x04, "Nx_Port not available, permament"},
-	{0x05, "class not supported"},
-	{0x06, "delimiter usage error"},
-	{0x07, "TYPE not supported"},
-	{0x08, "invalid Link_Control"},
-	{0x09, "invalid R_CTL field"},
-	{0x0a, "invalid F_CTL field"},
-	{0x0b, "invalid OX_ID"},
-	{0x0c, "invalid RX_ID"},
-	{0x0d, "invalid SEQ_ID"},
-	{0x0e, "invalid DF_CTL"},
-	{0x0f, "invalid SEQ_CNT"},
-	{0x10, "invalid parameter field"},
-	{0x11, "exchange error"},
-	{0x12, "protocol error"},
-	{0x13, "incorrect length"},
-	{0x14, "unsupported ACK"},
-	{0x15, "class of service not supported by entity at FFFFFE"},
-	{0x16, "login required"},
-	{0x17, "excessive sequences attempted"},
-	{0x18, "unable to establish exchange"},
-	{0x1a, "fabric path not available"},
-	{0x1b, "invalid VC_ID (class 4)"},
-	{0x1c, "invalid CS_CTL field"},
-	{0x1d, "insufficient resources for VC (class 4)"},
-	{0x1f, "invalid class of service"},
-	{0x20, "preemption request rejected"},
-	{0x21, "preemption not enabled"},
-	{0x22, "multicast error"},
-	{0x23, "multicast error terminate"},
-	{0x24, "process login required"},
-	{0xff, "vendor specific reject"},
-	{0, NULL},
-};
-
 /**
- * zfcp_rc_description - return description for given reaon code
- * @code: reason code
- * @rc_table: table of reason codes and descriptions
+ * zfcp_sg_free_table - free memory used by scatterlists
+ * @sg: pointer to scatterlist
+ * @count: number of scatterlist which are to be free'ed
+ * the scatterlist are expected to reference pages always
  */
-static const char *
-zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
+void zfcp_sg_free_table(struct scatterlist *sg, int count)
 {
-	const char *descr = "unknown reason code";
+	int i;
 
-	do {
-		if (code == rc_table->code) {
-			descr = rc_table->description;
+	for (i = 0; i < count; i++, sg++)
+		if (sg)
+			free_page((unsigned long) sg_virt(sg));
+		else
 			break;
-		}
-		rc_table++;
-	} while (rc_table->code && rc_table->description);
-
-	return descr;
 }
 
 /**
- * zfcp_check_ct_response - evaluate reason code for CT_IU
- * @rjt: response payload to an CT_IU request
- * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
+ * zfcp_sg_setup_table - init scatterlist and allocate, assign buffers
+ * @sg: pointer to struct scatterlist
+ * @count: number of scatterlists which should be assigned with buffers
+ * of size page
+ *
+ * Returns: 0 on success, -ENOMEM otherwise
  */
-int
-zfcp_check_ct_response(struct ct_hdr *rjt)
+int zfcp_sg_setup_table(struct scatterlist *sg, int count)
 {
-	if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
-		return 0;
+	void *addr;
+	int i;
 
-	if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
-		ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
-				"response code (0x%04hx)\n",
-				rjt->cmd_rsp_code);
-		return 1;
+	sg_init_table(sg, count);
+	for (i = 0; i < count; i++, sg++) {
+		addr = (void *) get_zeroed_page(GFP_KERNEL);
+		if (!addr) {
+			zfcp_sg_free_table(sg, i);
+			return -ENOMEM;
+		}
+		sg_set_buf(sg, addr, PAGE_SIZE);
 	}
-
-	ZFCP_LOG_INFO("Generic Service command rejected\n");
-	ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
-		      zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
-		      (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
-		      (u32) rjt->vendor_unique);
-
-	return 1;
-}
-
-/**
- * zfcp_print_els_rjt - print reject parameter and description for ELS reject
- * @rjt_par: reject parameter acc. to FC-PH/FC-FS
- * @rc_table: table of reason codes and descriptions
- */
-static void
-zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
-		   const struct zfcp_rc_entry *rc_table)
-{
-	ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
-		      zfcp_rc_description(rjt_par->reason_code, rc_table),
-		      (u32) rjt_par->action, (u32) rjt_par->reason_code,
-		      (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
-}
-
-/**
- * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
- * @sq: status qualifier word
- * @rjt_par: reject parameter as described in FC-PH and FC-FS
- * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
- */
-int
-zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
-{
-	int ret = -EIO;
-
-	if (sq == FSF_IOSTAT_NPORT_RJT) {
-		ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
-		zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
-		/* invalid d_id */
-		if (rjt_par->reason_code == 0x01)
-			ret = -EREMCHG;
-	} else if (sq == FSF_IOSTAT_FABRIC_RJT) {
-		ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
-		zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
-		/* invalid d_id */
-		if (rjt_par->reason_code == 0x01)
-			ret = -EREMCHG;
-	} else if (sq == FSF_IOSTAT_LS_RJT) {
-		ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
-		zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
-		ret = -EREMOTEIO;
-	} else
-		ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
-
-	return ret;
-}
-
-/**
- * zfcp_plogi_evaluate - evaluate PLOGI playload and copy important fields
- * into zfcp_port structure
- * @port: zfcp_port structure
- * @plogi: plogi payload
- */
-void
-zfcp_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
-{
-	port->maxframe_size = plogi->serv_param.common_serv_param[7] |
-		((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
-	if (plogi->serv_param.class1_serv_param[0] & 0x80)
-		port->supported_classes |= FC_COS_CLASS1;
-	if (plogi->serv_param.class2_serv_param[0] & 0x80)
-		port->supported_classes |= FC_COS_CLASS2;
-	if (plogi->serv_param.class3_serv_param[0] & 0x80)
-		port->supported_classes |= FC_COS_CLASS3;
-	if (plogi->serv_param.class4_serv_param[0] & 0x80)
-		port->supported_classes |= FC_COS_CLASS4;
+	return 0;
 }
-
-#undef ZFCP_LOG_AREA