[PATCH] s390: revert dasd eer module

Revert dasd eer module until we have a common understanding of how the
interface should be.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 0 insertions, 1090 deletions

diff --git a/drivers/s390/block/dasd_eer.c b/drivers/s390/block/dasd_eer.c
deleted file mode 100644
index f70cd7716b24..000000000000
--- a/drivers/s390/block/dasd_eer.c
+++ /dev/null
@@ -1,1090 +0,0 @@
-/*
- *	character device driver for extended error reporting
- *
- *
- *	Copyright (C) 2005 IBM Corporation
- *	extended error reporting for DASD ECKD devices
- *	Author(s): Stefan Weinhuber <wein@de.ibm.com>
- *
- */
-
-#include <linux/init.h>
-#include <linux/fs.h>
-#include <linux/kernel.h>
-#include <linux/miscdevice.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/device.h>
-#include <linux/workqueue.h>
-#include <linux/poll.h>
-#include <linux/notifier.h>
-
-#include <asm/uaccess.h>
-#include <asm/semaphore.h>
-#include <asm/atomic.h>
-#include <asm/ebcdic.h>
-
-#include "dasd_int.h"
-#include "dasd_eckd.h"
-
-
-MODULE_LICENSE("GPL");
-
-MODULE_AUTHOR("Stefan Weinhuber <wein@de.ibm.com>");
-MODULE_DESCRIPTION("DASD extended error reporting module");
-
-
-#ifdef PRINTK_HEADER
-#undef PRINTK_HEADER
-#endif				/* PRINTK_HEADER */
-#define PRINTK_HEADER "dasd(eer):"
-
-
-
-
-
-/*****************************************************************************/
-/*      the internal buffer                                                  */
-/*****************************************************************************/
-
-/*
- * The internal buffer is meant to store obaque blobs of data, so it doesn't
- * know of higher level concepts like triggers.
- * It consists of a number of pages that are used as a ringbuffer. Each data
- * blob is stored in a simple record that consists of an integer, which
- * contains the size of the following data, and the data bytes themselfes.
- *
- * To allow for multiple independent readers we create one internal buffer
- * each time the device is opened and destroy the buffer when the file is
- * closed again.
- *
- * One record can be written to a buffer by using the functions
- * - dasd_eer_start_record (one time per record to write the size to the buffer
- *                          and reserve the space for the data)
- * - dasd_eer_write_buffer (one or more times per record to write the data)
- * The data can be written in several steps but you will have to compute
- * the total size up front for the invocation of dasd_eer_start_record.
- * If the ringbuffer is full, dasd_eer_start_record will remove the required
- * number of old records.
- *
- * A record is typically read in two steps, first read the integer that
- * specifies the size of the following data, then read the data.
- * Both can be done by
- * - dasd_eer_read_buffer
- *
- * For all mentioned functions you need to get the bufferlock first and keep it
- * until a complete record is written or read.
- */
-
-
-/*
- * Alle information necessary to keep track of an internal buffer is kept in
- * a struct eerbuffer. The buffer specific to a file pointer is strored in
- * the private_data field of that file. To be able to write data to all
- * existing buffers, each buffer is also added to the bufferlist.
- * If the user doesn't want to read a complete record in one go, we have to
- * keep track of the rest of the record. residual stores the number of bytes
- * that are still to deliver. If the rest of the record is invalidated between
- * two reads then residual will be set to -1 so that the next read will fail.
- * All entries in the eerbuffer structure are protected with the bufferlock.
- * To avoid races between writing to a buffer on the one side and creating
- * and destroying buffers on the other side, the bufferlock must also be used
- * to protect the bufferlist.
- */
-
-struct eerbuffer {
-	struct list_head list;
-	char **buffer;
-	int buffersize;
-	int buffer_page_count;
-	int head;
-        int tail;
-	int residual;
-};
-
-LIST_HEAD(bufferlist);
-
-static spinlock_t bufferlock = SPIN_LOCK_UNLOCKED;
-
-DECLARE_WAIT_QUEUE_HEAD(dasd_eer_read_wait_queue);
-
-/*
- * How many free bytes are available on the buffer.
- * needs to be called with bufferlock held
- */
-static int
-dasd_eer_get_free_bytes(struct eerbuffer *eerb)
-{
-	if (eerb->head < eerb->tail) {
-		return eerb->tail - eerb->head - 1;
-	} else
-		return eerb->buffersize - eerb->head + eerb->tail -1;
-}
-
-/*
- * How many bytes of buffer space are used.
- * needs to be called with bufferlock held
- */
-static int
-dasd_eer_get_filled_bytes(struct eerbuffer *eerb)
-{
-
-	if (eerb->head >= eerb->tail) {
-		return eerb->head - eerb->tail;
-	} else
-		return eerb->buffersize - eerb->tail + eerb->head;
-}
-
-/*
- * The dasd_eer_write_buffer function just copies count bytes of data
- * to the buffer. Make sure to call dasd_eer_start_record first, to
- * make sure that enough free space is available.
- * needs to be called with bufferlock held
- */
-static void
-dasd_eer_write_buffer(struct eerbuffer *eerb, int count, char *data)
-{
-
-	unsigned long headindex,localhead;
-	unsigned long rest, len;
-	char *nextdata;
-
-	nextdata = data;
-	rest = count;
-	while (rest > 0) {
- 		headindex = eerb->head / PAGE_SIZE;
- 		localhead = eerb->head % PAGE_SIZE;
-		len = min(rest, (PAGE_SIZE - localhead));
-		memcpy(eerb->buffer[headindex]+localhead, nextdata, len);
-		nextdata += len;
-		rest -= len;
-		eerb->head += len;
-		if ( eerb->head == eerb->buffersize )
-			eerb->head = 0; /* wrap around */
-		if (eerb->head > eerb->buffersize) {
-			MESSAGE(KERN_ERR, "%s", "runaway buffer head.");
-			BUG();
-		}
-	}
-}
-
-/*
- * needs to be called with bufferlock held
- */
-static int
-dasd_eer_read_buffer(struct eerbuffer *eerb, int count, char *data)
-{
-
-	unsigned long tailindex,localtail;
-	unsigned long rest, len, finalcount;
-	char *nextdata;
-
-	finalcount = min(count, dasd_eer_get_filled_bytes(eerb));
-	nextdata = data;
-	rest = finalcount;
-	while (rest > 0) {
- 		tailindex = eerb->tail / PAGE_SIZE;
- 		localtail = eerb->tail % PAGE_SIZE;
-		len = min(rest, (PAGE_SIZE - localtail));
-		memcpy(nextdata, eerb->buffer[tailindex]+localtail, len);
-		nextdata += len;
-		rest -= len;
-		eerb->tail += len;
-		if ( eerb->tail == eerb->buffersize )
-			eerb->tail = 0; /* wrap around */
-		if (eerb->tail > eerb->buffersize) {
-			MESSAGE(KERN_ERR, "%s", "runaway buffer tail.");
-			BUG();
-		}
-	}
-	return finalcount;
-}
-
-/*
- * Whenever you want to write a blob of data to the internal buffer you
- * have to start by using this function first. It will write the number
- * of bytes that will be written to the buffer. If necessary it will remove
- * old records to make room for the new one.
- * needs to be called with bufferlock held
- */
-static int
-dasd_eer_start_record(struct eerbuffer *eerb, int count)
-{
-	int tailcount;
-	if (count + sizeof(count) > eerb->buffersize)
-		return -ENOMEM;
-	while (dasd_eer_get_free_bytes(eerb) < count + sizeof(count)) {
-		if (eerb->residual > 0) {
-			eerb->tail += eerb->residual;
-			if (eerb->tail >= eerb->buffersize)
-				eerb->tail -= eerb->buffersize;
-			eerb->residual = -1;
-		}
-		dasd_eer_read_buffer(eerb, sizeof(tailcount),
-				     (char*)(&tailcount));
-		eerb->tail += tailcount;
-		if (eerb->tail >= eerb->buffersize)
-			eerb->tail -= eerb->buffersize;
-	}
-	dasd_eer_write_buffer(eerb, sizeof(count), (char*)(&count));
-
-	return 0;
-};
-
-/*
- * release pages that are not used anymore
- */
-static void
-dasd_eer_free_buffer_pages(char **buf, int no_pages)
-{
-	int i;
-
-	for (i = 0; i < no_pages; ++i) {
-		free_page((unsigned long)buf[i]);
-	}
-}
-
-/*
- * allocate a new set of memory pages
- */
-static int
-dasd_eer_allocate_buffer_pages(char **buf, int no_pages)
-{
-	int i;
-
-	for (i = 0; i < no_pages; ++i) {
-		buf[i] = (char *) get_zeroed_page(GFP_KERNEL);
-		if (!buf[i]) {
-			dasd_eer_free_buffer_pages(buf, i);
-			return -ENOMEM;
-		}
-	}
-	return 0;
-}
-
-/*
- * empty the buffer by resetting head and tail
- * In case there is a half read data blob in the buffer, we set residual
- * to -1 to indicate that the remainder of the blob is lost.
- */
-static void
-dasd_eer_purge_buffer(struct eerbuffer *eerb)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&bufferlock, flags);
-	if (eerb->residual > 0)
-		eerb->residual = -1;
-	eerb->tail=0;
-	eerb->head=0;
-	spin_unlock_irqrestore(&bufferlock, flags);
-}
-
-/*
- * set the size of the buffer, newsize is the new number of pages to be used
- * we don't try to copy any data back an forth, so any resize will also purge
- * the buffer
- */
-static int
-dasd_eer_resize_buffer(struct eerbuffer *eerb, int newsize)
-{
-	int i, oldcount, reuse;
-	char **new;
-	char **old;
-	unsigned long flags;
-
-	if (newsize < 1)
-		return -EINVAL;
-	if (eerb->buffer_page_count == newsize) {
-		/* documented behaviour is that any successfull invocation
-                 * will purge all records */
-		dasd_eer_purge_buffer(eerb);
-		return 0;
-	}
-	new = kmalloc(newsize*sizeof(char*), GFP_KERNEL);
-	if (!new)
-		return -ENOMEM;
-
-	reuse=min(eerb->buffer_page_count, newsize);
-	for (i = 0; i < reuse; ++i) {
-		new[i] = eerb->buffer[i];
-	}
-	if (eerb->buffer_page_count < newsize) {
-		if (dasd_eer_allocate_buffer_pages(
-			    &new[eerb->buffer_page_count],
-			    newsize - eerb->buffer_page_count)) {
-			kfree(new);
-			return -ENOMEM;
-		}
-	}
-
-	spin_lock_irqsave(&bufferlock, flags);
-	old = eerb->buffer;
-	eerb->buffer = new;
-	if (eerb->residual > 0)
-		eerb->residual = -1;
-	eerb->tail = 0;
-	eerb->head = 0;
-	oldcount = eerb->buffer_page_count;
-	eerb->buffer_page_count = newsize;
-	spin_unlock_irqrestore(&bufferlock, flags);
-
-	if (oldcount > newsize) {
-		for (i = newsize; i < oldcount; ++i) {
-			free_page((unsigned long)old[i]);
-		}
-	}
-	kfree(old);
-
-	return 0;
-}
-
-
-/*****************************************************************************/
-/*      The extended error reporting functionality                           */
-/*****************************************************************************/
-
-/*
- * When a DASD device driver wants to report an error, it calls the
- * function dasd_eer_write_trigger (via a notifier mechanism) and gives the
- * respective trigger ID as parameter.
- * Currently there are four kinds of triggers:
- *
- * DASD_EER_FATALERROR:  all kinds of unrecoverable I/O problems
- * DASD_EER_PPRCSUSPEND: PPRC was suspended
- * DASD_EER_NOPATH:      There is no path to the device left.
- * DASD_EER_STATECHANGE: The state of the device has changed.
- *
- * For the first three triggers all required information can be supplied by
- * the caller. For these triggers a record is written by the function
- * dasd_eer_write_standard_trigger.
- *
- * When dasd_eer_write_trigger is called to write a DASD_EER_STATECHANGE
- * trigger, we have to gather the necessary sense data first. We cannot queue
- * the necessary SNSS (sense subsystem status) request immediatly, since we
- * are likely to run in a deadlock situation. Instead, we schedule a
- * work_struct that calls the function dasd_eer_sense_subsystem_status to
- * create and start an SNSS  request asynchronously.
- *
- * To avoid memory allocations at runtime, the necessary memory is allocated
- * when the extended error reporting is enabled for a device (by
- * dasd_eer_probe). There is one private eer data structure for each eer
- * enabled DASD device. It contains memory for the work_struct, one SNSS cqr
- * and a flags field that is used to coordinate the use of the cqr. The call
- * to write a state change trigger can come in at any time, so we have one flag
- * CQR_IN_USE that protects the cqr itself. When this flag indicates that the
- * cqr is currently in use, dasd_eer_sense_subsystem_status cannot start a
- * second request but sets the SNSS_REQUESTED flag instead.
- *
- * When the request is finished, the callback function dasd_eer_SNSS_cb
- * is called. This function will invoke the function
- * dasd_eer_write_SNSS_trigger to finally write the trigger. It will also
- * check the SNSS_REQUESTED flag and if it is set it will call
- * dasd_eer_sense_subsystem_status again.
- *
- * To avoid race conditions during the handling of the lock, the flags must
- * be protected by the snsslock.
- */
-
-struct dasd_eer_private {
-	struct dasd_ccw_req *cqr;
-	unsigned long flags;
-	struct work_struct worker;
-};
-
-static void dasd_eer_destroy(struct dasd_device *device,
-			     struct dasd_eer_private *eer);
-static int
-dasd_eer_write_trigger(struct dasd_eer_trigger *trigger);
-static void dasd_eer_sense_subsystem_status(void *data);
-static int dasd_eer_notify(struct notifier_block *self,
-			   unsigned long action, void *data);
-
-struct workqueue_struct *dasd_eer_workqueue;
-
-#define SNSS_DATA_SIZE 44
-static spinlock_t snsslock = SPIN_LOCK_UNLOCKED;
-
-#define DASD_EER_BUSID_SIZE 10
-struct dasd_eer_header {
-	__u32 total_size;
-	__u32 trigger;
-	__u64 tv_sec;
-	__u64 tv_usec;
-	char busid[DASD_EER_BUSID_SIZE];
-} __attribute__ ((packed));
-
-static struct notifier_block dasd_eer_nb = {
-	.notifier_call = dasd_eer_notify,
-};
-
-/*
- * flags for use with dasd_eer_private
- */
-#define CQR_IN_USE     0
-#define SNSS_REQUESTED 1
-
-/*
- * This function checks if extended error reporting is available for a given
- * dasd_device. If yes, then it creates and returns a struct dasd_eer,
- * otherwise it returns an -EPERM error pointer.
- */
-struct dasd_eer_private *
-dasd_eer_probe(struct dasd_device *device)
-{
-	struct dasd_eer_private *private;
-
-	if (!(device && device->discipline
-	      && !strcmp(device->discipline->name, "ECKD"))) {
-		return ERR_PTR(-EPERM);
-	}
-	/* allocate the private data structure */
-	private = (struct dasd_eer_private *)kmalloc(
-		sizeof(struct dasd_eer_private), GFP_KERNEL);
-	if (!private) {
-		return ERR_PTR(-ENOMEM);
-	}
-	INIT_WORK(&private->worker, dasd_eer_sense_subsystem_status,
-		  (void *)device);
-	private->cqr = dasd_kmalloc_request("ECKD",
-					    1 /* SNSS */ ,
-					    SNSS_DATA_SIZE ,
-					    device);
-	if (!private->cqr) {
-		kfree(private);
-		return ERR_PTR(-ENOMEM);
-	}
-	private->flags = 0;
-	return private;
-};
-
-/*
- * If our private SNSS request is queued, remove it from the
- * dasd ccw queue so we can free the requests memory.
- */
-static void
-dasd_eer_dequeue_SNSS_request(struct dasd_device *device,
-			      struct dasd_eer_private *eer)
-{
-	struct list_head *lst, *nxt;
-	struct dasd_ccw_req *cqr, *erpcqr;
-	dasd_erp_fn_t erp_fn;
-
-	spin_lock_irq(get_ccwdev_lock(device->cdev));
-	list_for_each_safe(lst, nxt, &device->ccw_queue) {
-		cqr = list_entry(lst, struct dasd_ccw_req, list);
-		/* we are looking for two kinds or requests */
-		/* first kind: our SNSS request: */
-		if (cqr == eer->cqr) {
-			if (cqr->status == DASD_CQR_IN_IO)
-				device->discipline->term_IO(cqr);
-			list_del(&cqr->list);
-			break;
-		}
-		/* second kind: ERP requests for our SNSS request */
-		if (cqr->refers) {
-			/* If this erp request chain ends in our cqr, then */
-                        /* cal the erp_postaction to clean it up  */
-			erpcqr = cqr;
-			while (erpcqr->refers) {
-				erpcqr = erpcqr->refers;
-			}
-			if (erpcqr == eer->cqr) {
-				erp_fn = device->discipline->erp_postaction(
-					 cqr);
-				erp_fn(cqr);
-			}
-			continue;
-		}
-	}
-	spin_unlock_irq(get_ccwdev_lock(device->cdev));
-}
-
-/*
- * This function dismantles a struct dasd_eer that was created by
- * dasd_eer_probe. Since we want to free our private data structure,
- * we must make sure that the memory is not in use anymore.
- * We have to flush the work queue and remove a possible SNSS request
- * from the dasd queue.
- */
-static void
-dasd_eer_destroy(struct dasd_device *device, struct dasd_eer_private *eer)
-{
-	flush_workqueue(dasd_eer_workqueue);
-	dasd_eer_dequeue_SNSS_request(device, eer);
-	dasd_kfree_request(eer->cqr, device);
-	kfree(eer);
-};
-
-/*
- * enable the extended error reporting for a particular device
- */
-static int
-dasd_eer_enable_on_device(struct dasd_device *device)
-{
-	void *eer;
-	if (!device)
-		return -ENODEV;
-	if (device->eer)
-		return 0;
-	if (!try_module_get(THIS_MODULE)) {
-		return -EINVAL;
-	}
-	eer = (void *)dasd_eer_probe(device);
-	if (IS_ERR(eer)) {
-		module_put(THIS_MODULE);
-		return PTR_ERR(eer);
-	}
-	device->eer = eer;
-	return 0;
-}
-
-/*
- * enable the extended error reporting for a particular device
- */
-static int
-dasd_eer_disable_on_device(struct dasd_device *device)
-{
-	struct dasd_eer_private *eer = device->eer;
-
-	if (!device)
-		return -ENODEV;
-	if (!device->eer)
-		return 0;
-	device->eer = NULL;
-	dasd_eer_destroy(device,eer);
-	module_put(THIS_MODULE);
-
-	return 0;
-}
-
-/*
- * Set extended error reporting (eer)
- * Note: This will be registered as a DASD ioctl, to be called on DASD devices.
- */
-static int
-dasd_ioctl_set_eer(struct block_device *bdev, int no, long args)
-{
-	struct dasd_device *device;
-	int intval;
-
-	if (!capable(CAP_SYS_ADMIN))
-		return -EACCES;
-	if (bdev != bdev->bd_contains)
-		/* Error-reporting is not allowed for partitions */
-		return -EINVAL;
-	if (get_user(intval, (int __user *) args))
-		return -EFAULT;
-	device =  bdev->bd_disk->private_data;
-	if (device == NULL)
-		return -ENODEV;
-
-	intval = (intval != 0);
-	DEV_MESSAGE (KERN_DEBUG, device,
-		     "set eer on device to %d", intval);
-	if (intval)
-		return dasd_eer_enable_on_device(device);
-	else
-		return dasd_eer_disable_on_device(device);
-}
-
-/*
- * Get value of extended error reporting.
- * Note: This will be registered as a DASD ioctl, to be called on DASD devices.
- */
-static int
-dasd_ioctl_get_eer(struct block_device *bdev, int no, long args)
-{
-	struct dasd_device *device;
-
-	device =  bdev->bd_disk->private_data;
-	if (device == NULL)
-		return -ENODEV;
-	return put_user((device->eer != NULL), (int __user *) args);
-}
-
-/*
- * The following function can be used for those triggers that have
- * all necessary data available when the function is called.
- * If the parameter cqr is not NULL, the chain of requests will be searched
- * for valid sense data, and all valid sense data sets will be added to
- * the triggers data.
- */
-static int
-dasd_eer_write_standard_trigger(int trigger, struct dasd_device *device,
-				struct dasd_ccw_req *cqr)
-{
-	struct dasd_ccw_req *temp_cqr;
-	int data_size;
-	struct timeval tv;
-	struct dasd_eer_header header;
-	unsigned long flags;
-	struct eerbuffer *eerb;
-
-	/* go through cqr chain and count the valid sense data sets */
-	temp_cqr = cqr;
-	data_size = 0;
-	while (temp_cqr) {
-		if (temp_cqr->irb.esw.esw0.erw.cons)
-			data_size += 32;
-		temp_cqr = temp_cqr->refers;
-	}
-
-	header.total_size = sizeof(header) + data_size + 4; /* "EOR" */
-	header.trigger = trigger;
-	do_gettimeofday(&tv);
-	header.tv_sec = tv.tv_sec;
-	header.tv_usec = tv.tv_usec;
-	strncpy(header.busid, device->cdev->dev.bus_id, DASD_EER_BUSID_SIZE);
-
-	spin_lock_irqsave(&bufferlock, flags);
-	list_for_each_entry(eerb, &bufferlist, list) {
-		dasd_eer_start_record(eerb, header.total_size);
-		dasd_eer_write_buffer(eerb, sizeof(header), (char*)(&header));
-		temp_cqr = cqr;
-		while (temp_cqr) {
-			if (temp_cqr->irb.esw.esw0.erw.cons)
-				dasd_eer_write_buffer(eerb, 32, cqr->irb.ecw);
-			temp_cqr = temp_cqr->refers;
-		}
-		dasd_eer_write_buffer(eerb, 4,"EOR");
-	}
-	spin_unlock_irqrestore(&bufferlock, flags);
-
-	wake_up_interruptible(&dasd_eer_read_wait_queue);
-
-	return 0;
-}
-
-/*
- * This function writes a DASD_EER_STATECHANGE trigger.
- */
-static void
-dasd_eer_write_SNSS_trigger(struct dasd_device *device,
-			    struct dasd_ccw_req *cqr)
-{
-	int data_size;
-	int snss_rc;
-	struct timeval tv;
-	struct dasd_eer_header header;
-	unsigned long flags;
-	struct eerbuffer *eerb;
-
-	snss_rc = (cqr->status == DASD_CQR_FAILED) ? -EIO : 0;
-	if (snss_rc)
-		data_size = 0;
-	else
-		data_size = SNSS_DATA_SIZE;
-
-	header.total_size = sizeof(header) + data_size + 4; /* "EOR" */
-	header.trigger = DASD_EER_STATECHANGE;
-	do_gettimeofday(&tv);
-	header.tv_sec = tv.tv_sec;
-	header.tv_usec = tv.tv_usec;
-	strncpy(header.busid, device->cdev->dev.bus_id, DASD_EER_BUSID_SIZE);
-
-	spin_lock_irqsave(&bufferlock, flags);
-	list_for_each_entry(eerb, &bufferlist, list) {
-		dasd_eer_start_record(eerb, header.total_size);
-		dasd_eer_write_buffer(eerb, sizeof(header),(char*)(&header));
-		if (!snss_rc)
-			dasd_eer_write_buffer(eerb, SNSS_DATA_SIZE, cqr->data);
-		dasd_eer_write_buffer(eerb, 4,"EOR");
-	}
-	spin_unlock_irqrestore(&bufferlock, flags);
-
-	wake_up_interruptible(&dasd_eer_read_wait_queue);
-}
-
-/*
- * callback function for use with SNSS request
- */
-static void
-dasd_eer_SNSS_cb(struct dasd_ccw_req *cqr, void *data)
-{
-        struct dasd_device *device;
-	struct dasd_eer_private *private;
-	unsigned long irqflags;
-
-        device = (struct dasd_device *)data;
-	private = (struct dasd_eer_private *)device->eer;
-	dasd_eer_write_SNSS_trigger(device, cqr);
-	spin_lock_irqsave(&snsslock, irqflags);
-	if(!test_and_clear_bit(SNSS_REQUESTED, &private->flags)) {
-		clear_bit(CQR_IN_USE, &private->flags);
-		spin_unlock_irqrestore(&snsslock, irqflags);
-		return;
-	};
-	clear_bit(CQR_IN_USE, &private->flags);
-	spin_unlock_irqrestore(&snsslock, irqflags);
-	dasd_eer_sense_subsystem_status(device);
-	return;
-}
-
-/*
- * clean a used cqr before using it again
- */
-static void
-dasd_eer_clean_SNSS_request(struct dasd_ccw_req *cqr)
-{
-	struct ccw1 *cpaddr = cqr->cpaddr;
-	void *data = cqr->data;
-
-	memset(cqr, 0, sizeof(struct dasd_ccw_req));
-	memset(cpaddr, 0, sizeof(struct ccw1));
-	memset(data, 0, SNSS_DATA_SIZE);
-	cqr->cpaddr = cpaddr;
-	cqr->data = data;
-	strncpy((char *) &cqr->magic, "ECKD", 4);
-	ASCEBC((char *) &cqr->magic, 4);
-	set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
-}
-
-/*
- * build and start an SNSS request
- * This function is called from a work queue so we have to
- * pass the dasd_device pointer as a void pointer.
- */
-static void
-dasd_eer_sense_subsystem_status(void *data)
-{
-	struct dasd_device *device;
-	struct dasd_eer_private *private;
-	struct dasd_ccw_req *cqr;
-	struct ccw1 *ccw;
-	unsigned long irqflags;
-
-	device = (struct dasd_device *)data;
-	private = (struct dasd_eer_private *)device->eer;
-	if (!private) /* device not eer enabled any more */
-		return;
-	cqr = private->cqr;
-	spin_lock_irqsave(&snsslock, irqflags);
-	if(test_and_set_bit(CQR_IN_USE, &private->flags)) {
-		set_bit(SNSS_REQUESTED, &private->flags);
-		spin_unlock_irqrestore(&snsslock, irqflags);
-		return;
-	};
-	spin_unlock_irqrestore(&snsslock, irqflags);
-	dasd_eer_clean_SNSS_request(cqr);
-	cqr->device = device;
-	cqr->retries = 255;
-	cqr->expires = 10 * HZ;
-
-	ccw = cqr->cpaddr;
-	ccw->cmd_code = DASD_ECKD_CCW_SNSS;
-	ccw->count = SNSS_DATA_SIZE;
-	ccw->flags = 0;
-	ccw->cda = (__u32)(addr_t)cqr->data;
-
-	cqr->buildclk = get_clock();
-	cqr->status = DASD_CQR_FILLED;
-	cqr->callback = dasd_eer_SNSS_cb;
-	cqr->callback_data = (void *)device;
-        dasd_add_request_head(cqr);
-
-	return;
-}
-
-/*
- * This function is called for all triggers. It calls the appropriate
- * function that writes the actual trigger records.
- */
-static int
-dasd_eer_write_trigger(struct dasd_eer_trigger *trigger)
-{
-	int rc;
-	struct dasd_eer_private *private = trigger->device->eer;
-
-	switch (trigger->id) {
-	case DASD_EER_FATALERROR:
-	case DASD_EER_PPRCSUSPEND:
-		rc = dasd_eer_write_standard_trigger(
-			trigger->id, trigger->device, trigger->cqr);
-		break;
-	case DASD_EER_NOPATH:
-		rc = dasd_eer_write_standard_trigger(
-			trigger->id, trigger->device, NULL);
-		break;
-	case DASD_EER_STATECHANGE:
-                if (queue_work(dasd_eer_workqueue, &private->worker)) {
-                        rc=0;
-                } else {
-                        /* If the work_struct was already queued, it can't
-                         * be queued again. But this is OK since we don't
-                         * need to have it queued twice.
-                         */
-                        rc = -EBUSY;
-                }
-		break;
-	default: /* unknown trigger, so we write it without any sense data */
-		rc = dasd_eer_write_standard_trigger(
-			trigger->id, trigger->device, NULL);
-		break;
-	}
-	return rc;
-}
-
-/*
- * This function is registered with the dasd device driver and gets called
- * for all dasd eer notifications.
- */
-static int dasd_eer_notify(struct notifier_block *self,
-			    unsigned long action, void *data)
-{
-	switch (action) {
-	case DASD_EER_DISABLE:
-		dasd_eer_disable_on_device((struct dasd_device *)data);
-		break;
-	case DASD_EER_TRIGGER:
-		dasd_eer_write_trigger((struct dasd_eer_trigger *)data);
-		break;
-	}
-	return NOTIFY_OK;
-}
-
-
-/*****************************************************************************/
-/*      the device operations                                                */
-/*****************************************************************************/
-
-/*
- * On the one side we need a lock to access our internal buffer, on the
- * other side a copy_to_user can sleep. So we need to copy the data we have
- * to transfer in a readbuffer, which is protected by the readbuffer_mutex.
- */
-static char readbuffer[PAGE_SIZE];
-DECLARE_MUTEX(readbuffer_mutex);
-
-
-static int
-dasd_eer_open(struct inode *inp, struct file *filp)
-{
-	struct eerbuffer *eerb;
-	unsigned long flags;
-
-	eerb = kmalloc(sizeof(struct eerbuffer), GFP_KERNEL);
-	eerb->head = 0;
-	eerb->tail = 0;
-	eerb->residual = 0;
-	eerb->buffer_page_count = 1;
-	eerb->buffersize = eerb->buffer_page_count * PAGE_SIZE;
-        eerb->buffer = kmalloc(eerb->buffer_page_count*sizeof(char*),
-			       GFP_KERNEL);
-        if (!eerb->buffer)
-                return -ENOMEM;
-	if (dasd_eer_allocate_buffer_pages(eerb->buffer,
-					   eerb->buffer_page_count)) {
-		kfree(eerb->buffer);
-		return -ENOMEM;
-	}
-	filp->private_data = eerb;
-	spin_lock_irqsave(&bufferlock, flags);
-	list_add(&eerb->list, &bufferlist);
-	spin_unlock_irqrestore(&bufferlock, flags);
-
-	return nonseekable_open(inp,filp);
-}
-
-static int
-dasd_eer_close(struct inode *inp, struct file *filp)
-{
-	struct eerbuffer *eerb;
-	unsigned long flags;
-
-	eerb = (struct eerbuffer *)filp->private_data;
-	spin_lock_irqsave(&bufferlock, flags);
-	list_del(&eerb->list);
-	spin_unlock_irqrestore(&bufferlock, flags);
-	dasd_eer_free_buffer_pages(eerb->buffer, eerb->buffer_page_count);
-	kfree(eerb->buffer);
-	kfree(eerb);
-
-	return 0;
-}
-
-static long
-dasd_eer_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
-{
-	int intval;
-	struct eerbuffer *eerb;
-
-	eerb = (struct eerbuffer *)filp->private_data;
-	switch (cmd) {
-	case DASD_EER_PURGE:
-		dasd_eer_purge_buffer(eerb);
-		return 0;
-	case DASD_EER_SETBUFSIZE:
-		if (get_user(intval, (int __user *)arg))
-			return -EFAULT;
-		return dasd_eer_resize_buffer(eerb, intval);
-	default:
-		return -ENOIOCTLCMD;
-	}
-}
-
-static ssize_t
-dasd_eer_read(struct file *filp, char __user *buf, size_t count, loff_t *ppos)
-{
-	int tc,rc;
-	int tailcount,effective_count;
-        unsigned long flags;
-	struct eerbuffer *eerb;
-
-	eerb = (struct eerbuffer *)filp->private_data;
-	if(down_interruptible(&readbuffer_mutex))
-		return -ERESTARTSYS;
-
-	spin_lock_irqsave(&bufferlock, flags);
-
-	if (eerb->residual < 0) { /* the remainder of this record */
-		                  /* has been deleted             */
-		eerb->residual = 0;
-		spin_unlock_irqrestore(&bufferlock, flags);
-		up(&readbuffer_mutex);
-		return -EIO;
-	} else if (eerb->residual > 0) {
-		/* OK we still have a second half of a record to deliver */
-		effective_count = min(eerb->residual, (int)count);
-		eerb->residual -= effective_count;
-	} else {
-		tc = 0;
-		while (!tc) {
-			tc = dasd_eer_read_buffer(eerb,
-				sizeof(tailcount), (char*)(&tailcount));
-			if (!tc) {
-				/* no data available */
-				spin_unlock_irqrestore(&bufferlock, flags);
-				up(&readbuffer_mutex);
-				if (filp->f_flags & O_NONBLOCK)
-					return -EAGAIN;
-				rc = wait_event_interruptible(
-					dasd_eer_read_wait_queue,
-					eerb->head != eerb->tail);
-				if (rc) {
-					return rc;
-				}
-				if(down_interruptible(&readbuffer_mutex))
-					return -ERESTARTSYS;
-				spin_lock_irqsave(&bufferlock, flags);
-			}
-		}
-		WARN_ON(tc != sizeof(tailcount));
-		effective_count = min(tailcount,(int)count);
-		eerb->residual = tailcount - effective_count;
-	}
-
-	tc = dasd_eer_read_buffer(eerb, effective_count, readbuffer);
-	WARN_ON(tc != effective_count);
-
-	spin_unlock_irqrestore(&bufferlock, flags);
-
-	if (copy_to_user(buf, readbuffer, effective_count)) {
-		up(&readbuffer_mutex);
-		return -EFAULT;
-	}
-
-	up(&readbuffer_mutex);
-	return effective_count;
-}
-
-static unsigned int
-dasd_eer_poll (struct file *filp, poll_table *ptable)
-{
-	unsigned int mask;
-	unsigned long flags;
-	struct eerbuffer *eerb;
-
-	eerb = (struct eerbuffer *)filp->private_data;
-	poll_wait(filp, &dasd_eer_read_wait_queue, ptable);
-	spin_lock_irqsave(&bufferlock, flags);
-	if (eerb->head != eerb->tail)
-		mask = POLLIN | POLLRDNORM ;
-	else
-		mask = 0;
-	spin_unlock_irqrestore(&bufferlock, flags);
-	return mask;
-}
-
-static struct file_operations dasd_eer_fops = {
-	.open		= &dasd_eer_open,
-	.release	= &dasd_eer_close,
-	.unlocked_ioctl = &dasd_eer_ioctl,
-	.compat_ioctl	= &dasd_eer_ioctl,
-	.read		= &dasd_eer_read,
-	.poll		= &dasd_eer_poll,
-	.owner		= THIS_MODULE,
-};
-
-static struct miscdevice dasd_eer_dev = {
-	.minor	    = MISC_DYNAMIC_MINOR,
-	.name	    = "dasd_eer",
-	.fops	    = &dasd_eer_fops,
-};
-
-
-/*****************************************************************************/
-/*	Init and exit							     */
-/*****************************************************************************/
-
-static int
-__init dasd_eer_init(void)
-{
-	int rc;
-
-	dasd_eer_workqueue = create_singlethread_workqueue("dasd_eer");
-	if (!dasd_eer_workqueue) {
-		MESSAGE(KERN_ERR , "%s", "dasd_eer_init could not "
-		       "create workqueue \n");
-		rc = -ENOMEM;
-		goto out;
-	}
-
-	rc = dasd_register_eer_notifier(&dasd_eer_nb);
-	if (rc) {
-		MESSAGE(KERN_ERR, "%s", "dasd_eer_init could not "
-		       "register error reporting");
-		goto queue;
-	}
-
-	dasd_ioctl_no_register(THIS_MODULE, BIODASDEERSET, dasd_ioctl_set_eer);
-	dasd_ioctl_no_register(THIS_MODULE, BIODASDEERGET, dasd_ioctl_get_eer);
-
-	/* we don't need our own character device,
-	 * so we just register as misc device */
-	rc = misc_register(&dasd_eer_dev);
-	if (rc) {
-		MESSAGE(KERN_ERR, "%s", "dasd_eer_init could not "
-		       "register misc device");
-		goto unregister;
-	}
-
-	return 0;
-
-unregister:
-	dasd_unregister_eer_notifier(&dasd_eer_nb);
-	dasd_ioctl_no_unregister(THIS_MODULE, BIODASDEERSET,
-				 dasd_ioctl_set_eer);
-	dasd_ioctl_no_unregister(THIS_MODULE, BIODASDEERGET,
-				 dasd_ioctl_get_eer);
-queue:
-	destroy_workqueue(dasd_eer_workqueue);
-out:
-	return rc;
-
-}
-module_init(dasd_eer_init);
-
-static void
-__exit dasd_eer_exit(void)
-{
-	dasd_unregister_eer_notifier(&dasd_eer_nb);
-	dasd_ioctl_no_unregister(THIS_MODULE, BIODASDEERSET,
-				 dasd_ioctl_set_eer);
-	dasd_ioctl_no_unregister(THIS_MODULE, BIODASDEERGET,
-				 dasd_ioctl_get_eer);
-	destroy_workqueue(dasd_eer_workqueue);
-
-	WARN_ON(misc_deregister(&dasd_eer_dev) != 0);
-}
-module_exit(dasd_eer_exit);