Initial import

1 files changed, 1566 insertions, 0 deletions

diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c
new file mode 100644
index 000000000..acde3f5d6
--- /dev/null
+++ b/drivers/s390/scsi/zfcp_erp.c
@@ -0,0 +1,1566 @@
+/*
+ * zfcp device driver
+ *
+ * Error Recovery Procedures (ERP).
+ *
+ * Copyright IBM Corp. 2002, 2010
+ */
+
+#define KMSG_COMPONENT "zfcp"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/kthread.h>
+#include "zfcp_ext.h"
+#include "zfcp_reqlist.h"
+
+#define ZFCP_MAX_ERPS                   3
+
+enum zfcp_erp_act_flags {
+	ZFCP_STATUS_ERP_TIMEDOUT	= 0x10000000,
+	ZFCP_STATUS_ERP_CLOSE_ONLY	= 0x01000000,
+	ZFCP_STATUS_ERP_DISMISSING	= 0x00100000,
+	ZFCP_STATUS_ERP_DISMISSED	= 0x00200000,
+	ZFCP_STATUS_ERP_LOWMEM		= 0x00400000,
+	ZFCP_STATUS_ERP_NO_REF		= 0x00800000,
+};
+
+enum zfcp_erp_steps {
+	ZFCP_ERP_STEP_UNINITIALIZED	= 0x0000,
+	ZFCP_ERP_STEP_FSF_XCONFIG	= 0x0001,
+	ZFCP_ERP_STEP_PHYS_PORT_CLOSING	= 0x0010,
+	ZFCP_ERP_STEP_PORT_CLOSING	= 0x0100,
+	ZFCP_ERP_STEP_PORT_OPENING	= 0x0800,
+	ZFCP_ERP_STEP_LUN_CLOSING	= 0x1000,
+	ZFCP_ERP_STEP_LUN_OPENING	= 0x2000,
+};
+
+enum zfcp_erp_act_type {
+	ZFCP_ERP_ACTION_REOPEN_LUN         = 1,
+	ZFCP_ERP_ACTION_REOPEN_PORT	   = 2,
+	ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
+	ZFCP_ERP_ACTION_REOPEN_ADAPTER     = 4,
+};
+
+enum zfcp_erp_act_state {
+	ZFCP_ERP_ACTION_RUNNING = 1,
+	ZFCP_ERP_ACTION_READY   = 2,
+};
+
+enum zfcp_erp_act_result {
+	ZFCP_ERP_SUCCEEDED = 0,
+	ZFCP_ERP_FAILED    = 1,
+	ZFCP_ERP_CONTINUES = 2,
+	ZFCP_ERP_EXIT      = 3,
+	ZFCP_ERP_DISMISSED = 4,
+	ZFCP_ERP_NOMEM     = 5,
+};
+
+static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int mask)
+{
+	zfcp_erp_clear_adapter_status(adapter,
+				       ZFCP_STATUS_COMMON_UNBLOCKED | mask);
+}
+
+static int zfcp_erp_action_exists(struct zfcp_erp_action *act)
+{
+	struct zfcp_erp_action *curr_act;
+
+	list_for_each_entry(curr_act, &act->adapter->erp_running_head, list)
+		if (act == curr_act)
+			return ZFCP_ERP_ACTION_RUNNING;
+	return 0;
+}
+
+static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
+{
+	struct zfcp_adapter *adapter = act->adapter;
+
+	list_move(&act->list, &act->adapter->erp_ready_head);
+	zfcp_dbf_rec_run("erardy1", act);
+	wake_up(&adapter->erp_ready_wq);
+	zfcp_dbf_rec_run("erardy2", act);
+}
+
+static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act)
+{
+	act->status |= ZFCP_STATUS_ERP_DISMISSED;
+	if (zfcp_erp_action_exists(act) == ZFCP_ERP_ACTION_RUNNING)
+		zfcp_erp_action_ready(act);
+}
+
+static void zfcp_erp_action_dismiss_lun(struct scsi_device *sdev)
+{
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+
+	if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
+		zfcp_erp_action_dismiss(&zfcp_sdev->erp_action);
+}
+
+static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
+{
+	struct scsi_device *sdev;
+
+	if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
+		zfcp_erp_action_dismiss(&port->erp_action);
+	else {
+		spin_lock(port->adapter->scsi_host->host_lock);
+		__shost_for_each_device(sdev, port->adapter->scsi_host)
+			if (sdev_to_zfcp(sdev)->port == port)
+				zfcp_erp_action_dismiss_lun(sdev);
+		spin_unlock(port->adapter->scsi_host->host_lock);
+	}
+}
+
+static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
+{
+	struct zfcp_port *port;
+
+	if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
+		zfcp_erp_action_dismiss(&adapter->erp_action);
+	else {
+		read_lock(&adapter->port_list_lock);
+		list_for_each_entry(port, &adapter->port_list, list)
+		    zfcp_erp_action_dismiss_port(port);
+		read_unlock(&adapter->port_list_lock);
+	}
+}
+
+static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
+				 struct zfcp_port *port,
+				 struct scsi_device *sdev)
+{
+	int need = want;
+	int l_status, p_status, a_status;
+	struct zfcp_scsi_dev *zfcp_sdev;
+
+	switch (want) {
+	case ZFCP_ERP_ACTION_REOPEN_LUN:
+		zfcp_sdev = sdev_to_zfcp(sdev);
+		l_status = atomic_read(&zfcp_sdev->status);
+		if (l_status & ZFCP_STATUS_COMMON_ERP_INUSE)
+			return 0;
+		p_status = atomic_read(&port->status);
+		if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) ||
+		      p_status & ZFCP_STATUS_COMMON_ERP_FAILED)
+			return 0;
+		if (!(p_status & ZFCP_STATUS_COMMON_UNBLOCKED))
+			need = ZFCP_ERP_ACTION_REOPEN_PORT;
+		/* fall through */
+	case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
+		p_status = atomic_read(&port->status);
+		if (!(p_status & ZFCP_STATUS_COMMON_OPEN))
+			need = ZFCP_ERP_ACTION_REOPEN_PORT;
+		/* fall through */
+	case ZFCP_ERP_ACTION_REOPEN_PORT:
+		p_status = atomic_read(&port->status);
+		if (p_status & ZFCP_STATUS_COMMON_ERP_INUSE)
+			return 0;
+		a_status = atomic_read(&adapter->status);
+		if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) ||
+		      a_status & ZFCP_STATUS_COMMON_ERP_FAILED)
+			return 0;
+		if (p_status & ZFCP_STATUS_COMMON_NOESC)
+			return need;
+		if (!(a_status & ZFCP_STATUS_COMMON_UNBLOCKED))
+			need = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
+		/* fall through */
+	case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
+		a_status = atomic_read(&adapter->status);
+		if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE)
+			return 0;
+		if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) &&
+		    !(a_status & ZFCP_STATUS_COMMON_OPEN))
+			return 0; /* shutdown requested for closed adapter */
+	}
+
+	return need;
+}
+
+static struct zfcp_erp_action *zfcp_erp_setup_act(int need, u32 act_status,
+						  struct zfcp_adapter *adapter,
+						  struct zfcp_port *port,
+						  struct scsi_device *sdev)
+{
+	struct zfcp_erp_action *erp_action;
+	struct zfcp_scsi_dev *zfcp_sdev;
+
+	switch (need) {
+	case ZFCP_ERP_ACTION_REOPEN_LUN:
+		zfcp_sdev = sdev_to_zfcp(sdev);
+		if (!(act_status & ZFCP_STATUS_ERP_NO_REF))
+			if (scsi_device_get(sdev))
+				return NULL;
+		atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
+				&zfcp_sdev->status);
+		erp_action = &zfcp_sdev->erp_action;
+		memset(erp_action, 0, sizeof(struct zfcp_erp_action));
+		erp_action->port = port;
+		erp_action->sdev = sdev;
+		if (!(atomic_read(&zfcp_sdev->status) &
+		      ZFCP_STATUS_COMMON_RUNNING))
+			act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
+		break;
+
+	case ZFCP_ERP_ACTION_REOPEN_PORT:
+	case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
+		if (!get_device(&port->dev))
+			return NULL;
+		zfcp_erp_action_dismiss_port(port);
+		atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
+		erp_action = &port->erp_action;
+		memset(erp_action, 0, sizeof(struct zfcp_erp_action));
+		erp_action->port = port;
+		if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING))
+			act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
+		break;
+
+	case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
+		kref_get(&adapter->ref);
+		zfcp_erp_action_dismiss_adapter(adapter);
+		atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
+		erp_action = &adapter->erp_action;
+		memset(erp_action, 0, sizeof(struct zfcp_erp_action));
+		if (!(atomic_read(&adapter->status) &
+		      ZFCP_STATUS_COMMON_RUNNING))
+			act_status |= ZFCP_STATUS_ERP_CLOSE_ONLY;
+		break;
+
+	default:
+		return NULL;
+	}
+
+	erp_action->adapter = adapter;
+	erp_action->action = need;
+	erp_action->status = act_status;
+
+	return erp_action;
+}
+
+static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
+				   struct zfcp_port *port,
+				   struct scsi_device *sdev,
+				   char *id, u32 act_status)
+{
+	int retval = 1, need;
+	struct zfcp_erp_action *act;
+
+	if (!adapter->erp_thread)
+		return -EIO;
+
+	need = zfcp_erp_required_act(want, adapter, port, sdev);
+	if (!need)
+		goto out;
+
+	act = zfcp_erp_setup_act(need, act_status, adapter, port, sdev);
+	if (!act)
+		goto out;
+	atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
+	++adapter->erp_total_count;
+	list_add_tail(&act->list, &adapter->erp_ready_head);
+	wake_up(&adapter->erp_ready_wq);
+	retval = 0;
+ out:
+	zfcp_dbf_rec_trig(id, adapter, port, sdev, want, need);
+	return retval;
+}
+
+static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
+				    int clear_mask, char *id)
+{
+	zfcp_erp_adapter_block(adapter, clear_mask);
+	zfcp_scsi_schedule_rports_block(adapter);
+
+	/* ensure propagation of failed status to new devices */
+	if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
+		zfcp_erp_set_adapter_status(adapter,
+					    ZFCP_STATUS_COMMON_ERP_FAILED);
+		return -EIO;
+	}
+	return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
+				       adapter, NULL, NULL, id, 0);
+}
+
+/**
+ * zfcp_erp_adapter_reopen - Reopen adapter.
+ * @adapter: Adapter to reopen.
+ * @clear: Status flags to clear.
+ * @id: Id for debug trace event.
+ */
+void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear, char *id)
+{
+	unsigned long flags;
+
+	zfcp_erp_adapter_block(adapter, clear);
+	zfcp_scsi_schedule_rports_block(adapter);
+
+	write_lock_irqsave(&adapter->erp_lock, flags);
+	if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
+		zfcp_erp_set_adapter_status(adapter,
+					    ZFCP_STATUS_COMMON_ERP_FAILED);
+	else
+		zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER, adapter,
+					NULL, NULL, id, 0);
+	write_unlock_irqrestore(&adapter->erp_lock, flags);
+}
+
+/**
+ * zfcp_erp_adapter_shutdown - Shutdown adapter.
+ * @adapter: Adapter to shut down.
+ * @clear: Status flags to clear.
+ * @id: Id for debug trace event.
+ */
+void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
+			       char *id)
+{
+	int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
+	zfcp_erp_adapter_reopen(adapter, clear | flags, id);
+}
+
+/**
+ * zfcp_erp_port_shutdown - Shutdown port
+ * @port: Port to shut down.
+ * @clear: Status flags to clear.
+ * @id: Id for debug trace event.
+ */
+void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, char *id)
+{
+	int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
+	zfcp_erp_port_reopen(port, clear | flags, id);
+}
+
+static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
+{
+	zfcp_erp_clear_port_status(port,
+				    ZFCP_STATUS_COMMON_UNBLOCKED | clear);
+}
+
+static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear,
+					 char *id)
+{
+	zfcp_erp_port_block(port, clear);
+	zfcp_scsi_schedule_rport_block(port);
+
+	if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
+		return;
+
+	zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
+				port->adapter, port, NULL, id, 0);
+}
+
+/**
+ * zfcp_erp_port_forced_reopen - Forced close of port and open again
+ * @port: Port to force close and to reopen.
+ * @clear: Status flags to clear.
+ * @id: Id for debug trace event.
+ */
+void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, char *id)
+{
+	unsigned long flags;
+	struct zfcp_adapter *adapter = port->adapter;
+
+	write_lock_irqsave(&adapter->erp_lock, flags);
+	_zfcp_erp_port_forced_reopen(port, clear, id);
+	write_unlock_irqrestore(&adapter->erp_lock, flags);
+}
+
+static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id)
+{
+	zfcp_erp_port_block(port, clear);
+	zfcp_scsi_schedule_rport_block(port);
+
+	if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
+		/* ensure propagation of failed status to new devices */
+		zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
+		return -EIO;
+	}
+
+	return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
+				       port->adapter, port, NULL, id, 0);
+}
+
+/**
+ * zfcp_erp_port_reopen - trigger remote port recovery
+ * @port: port to recover
+ * @clear_mask: flags in port status to be cleared
+ * @id: Id for debug trace event.
+ *
+ * Returns 0 if recovery has been triggered, < 0 if not.
+ */
+int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id)
+{
+	int retval;
+	unsigned long flags;
+	struct zfcp_adapter *adapter = port->adapter;
+
+	write_lock_irqsave(&adapter->erp_lock, flags);
+	retval = _zfcp_erp_port_reopen(port, clear, id);
+	write_unlock_irqrestore(&adapter->erp_lock, flags);
+
+	return retval;
+}
+
+static void zfcp_erp_lun_block(struct scsi_device *sdev, int clear_mask)
+{
+	zfcp_erp_clear_lun_status(sdev,
+				  ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask);
+}
+
+static void _zfcp_erp_lun_reopen(struct scsi_device *sdev, int clear, char *id,
+				 u32 act_status)
+{
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+	struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
+
+	zfcp_erp_lun_block(sdev, clear);
+
+	if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
+		return;
+
+	zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_LUN, adapter,
+				zfcp_sdev->port, sdev, id, act_status);
+}
+
+/**
+ * zfcp_erp_lun_reopen - initiate reopen of a LUN
+ * @sdev: SCSI device / LUN to be reopened
+ * @clear_mask: specifies flags in LUN status to be cleared
+ * @id: Id for debug trace event.
+ *
+ * Return: 0 on success, < 0 on error
+ */
+void zfcp_erp_lun_reopen(struct scsi_device *sdev, int clear, char *id)
+{
+	unsigned long flags;
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+	struct zfcp_port *port = zfcp_sdev->port;
+	struct zfcp_adapter *adapter = port->adapter;
+
+	write_lock_irqsave(&adapter->erp_lock, flags);
+	_zfcp_erp_lun_reopen(sdev, clear, id, 0);
+	write_unlock_irqrestore(&adapter->erp_lock, flags);
+}
+
+/**
+ * zfcp_erp_lun_shutdown - Shutdown LUN
+ * @sdev: SCSI device / LUN to shut down.
+ * @clear: Status flags to clear.
+ * @id: Id for debug trace event.
+ */
+void zfcp_erp_lun_shutdown(struct scsi_device *sdev, int clear, char *id)
+{
+	int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
+	zfcp_erp_lun_reopen(sdev, clear | flags, id);
+}
+
+/**
+ * zfcp_erp_lun_shutdown_wait - Shutdown LUN and wait for erp completion
+ * @sdev: SCSI device / LUN to shut down.
+ * @id: Id for debug trace event.
+ *
+ * Do not acquire a reference for the LUN when creating the ERP
+ * action. It is safe, because this function waits for the ERP to
+ * complete first. This allows to shutdown the LUN, even when the SCSI
+ * device is in the state SDEV_DEL when scsi_device_get will fail.
+ */
+void zfcp_erp_lun_shutdown_wait(struct scsi_device *sdev, char *id)
+{
+	unsigned long flags;
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+	struct zfcp_port *port = zfcp_sdev->port;
+	struct zfcp_adapter *adapter = port->adapter;
+	int clear = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
+
+	write_lock_irqsave(&adapter->erp_lock, flags);
+	_zfcp_erp_lun_reopen(sdev, clear, id, ZFCP_STATUS_ERP_NO_REF);
+	write_unlock_irqrestore(&adapter->erp_lock, flags);
+
+	zfcp_erp_wait(adapter);
+}
+
+static int status_change_set(unsigned long mask, atomic_t *status)
+{
+	return (atomic_read(status) ^ mask) & mask;
+}
+
+static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
+{
+	if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
+		zfcp_dbf_rec_run("eraubl1", &adapter->erp_action);
+	atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
+}
+
+static void zfcp_erp_port_unblock(struct zfcp_port *port)
+{
+	if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
+		zfcp_dbf_rec_run("erpubl1", &port->erp_action);
+	atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
+}
+
+static void zfcp_erp_lun_unblock(struct scsi_device *sdev)
+{
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+
+	if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &zfcp_sdev->status))
+		zfcp_dbf_rec_run("erlubl1", &sdev_to_zfcp(sdev)->erp_action);
+	atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &zfcp_sdev->status);
+}
+
+static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
+{
+	list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
+	zfcp_dbf_rec_run("erator1", erp_action);
+}
+
+static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
+{
+	struct zfcp_adapter *adapter = act->adapter;
+	struct zfcp_fsf_req *req;
+
+	if (!act->fsf_req_id)
+		return;
+
+	spin_lock(&adapter->req_list->lock);
+	req = _zfcp_reqlist_find(adapter->req_list, act->fsf_req_id);
+	if (req && req->erp_action == act) {
+		if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
+				   ZFCP_STATUS_ERP_TIMEDOUT)) {
+			req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
+			zfcp_dbf_rec_run("erscf_1", act);
+			req->erp_action = NULL;
+		}
+		if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
+			zfcp_dbf_rec_run("erscf_2", act);
+		if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED)
+			act->fsf_req_id = 0;
+	} else
+		act->fsf_req_id = 0;
+	spin_unlock(&adapter->req_list->lock);
+}
+
+/**
+ * zfcp_erp_notify - Trigger ERP action.
+ * @erp_action: ERP action to continue.
+ * @set_mask: ERP action status flags to set.
+ */
+void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
+{
+	struct zfcp_adapter *adapter = erp_action->adapter;
+	unsigned long flags;
+
+	write_lock_irqsave(&adapter->erp_lock, flags);
+	if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
+		erp_action->status |= set_mask;
+		zfcp_erp_action_ready(erp_action);
+	}
+	write_unlock_irqrestore(&adapter->erp_lock, flags);
+}
+
+/**
+ * zfcp_erp_timeout_handler - Trigger ERP action from timed out ERP request
+ * @data: ERP action (from timer data)
+ */
+void zfcp_erp_timeout_handler(unsigned long data)
+{
+	struct zfcp_erp_action *act = (struct zfcp_erp_action *) data;
+	zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
+}
+
+static void zfcp_erp_memwait_handler(unsigned long data)
+{
+	zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
+}
+
+static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
+{
+	init_timer(&erp_action->timer);
+	erp_action->timer.function = zfcp_erp_memwait_handler;
+	erp_action->timer.data = (unsigned long) erp_action;
+	erp_action->timer.expires = jiffies + HZ;
+	add_timer(&erp_action->timer);
+}
+
+static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
+				      int clear, char *id)
+{
+	struct zfcp_port *port;
+
+	read_lock(&adapter->port_list_lock);
+	list_for_each_entry(port, &adapter->port_list, list)
+		_zfcp_erp_port_reopen(port, clear, id);
+	read_unlock(&adapter->port_list_lock);
+}
+
+static void _zfcp_erp_lun_reopen_all(struct zfcp_port *port, int clear,
+				     char *id)
+{
+	struct scsi_device *sdev;
+
+	spin_lock(port->adapter->scsi_host->host_lock);
+	__shost_for_each_device(sdev, port->adapter->scsi_host)
+		if (sdev_to_zfcp(sdev)->port == port)
+			_zfcp_erp_lun_reopen(sdev, clear, id, 0);
+	spin_unlock(port->adapter->scsi_host->host_lock);
+}
+
+static void zfcp_erp_strategy_followup_failed(struct zfcp_erp_action *act)
+{
+	switch (act->action) {
+	case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
+		_zfcp_erp_adapter_reopen(act->adapter, 0, "ersff_1");
+		break;
+	case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
+		_zfcp_erp_port_forced_reopen(act->port, 0, "ersff_2");
+		break;
+	case ZFCP_ERP_ACTION_REOPEN_PORT:
+		_zfcp_erp_port_reopen(act->port, 0, "ersff_3");
+		break;
+	case ZFCP_ERP_ACTION_REOPEN_LUN:
+		_zfcp_erp_lun_reopen(act->sdev, 0, "ersff_4", 0);
+		break;
+	}
+}
+
+static void zfcp_erp_strategy_followup_success(struct zfcp_erp_action *act)
+{
+	switch (act->action) {
+	case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
+		_zfcp_erp_port_reopen_all(act->adapter, 0, "ersfs_1");
+		break;
+	case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
+		_zfcp_erp_port_reopen(act->port, 0, "ersfs_2");
+		break;
+	case ZFCP_ERP_ACTION_REOPEN_PORT:
+		_zfcp_erp_lun_reopen_all(act->port, 0, "ersfs_3");
+		break;
+	}
+}
+
+static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
+{
+	unsigned long flags;
+
+	read_lock_irqsave(&adapter->erp_lock, flags);
+	if (list_empty(&adapter->erp_ready_head) &&
+	    list_empty(&adapter->erp_running_head)) {
+			atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
+					  &adapter->status);
+			wake_up(&adapter->erp_done_wqh);
+	}
+	read_unlock_irqrestore(&adapter->erp_lock, flags);
+}
+
+static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
+{
+	struct zfcp_port *port;
+	port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
+				 adapter->peer_d_id);
+	if (IS_ERR(port)) /* error or port already attached */
+		return;
+	_zfcp_erp_port_reopen(port, 0, "ereptp1");
+}
+
+static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
+{
+	int retries;
+	int sleep = 1;
+	struct zfcp_adapter *adapter = erp_action->adapter;
+
+	atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
+
+	for (retries = 7; retries; retries--) {
+		atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
+				  &adapter->status);
+		write_lock_irq(&adapter->erp_lock);
+		zfcp_erp_action_to_running(erp_action);
+		write_unlock_irq(&adapter->erp_lock);
+		if (zfcp_fsf_exchange_config_data(erp_action)) {
+			atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
+					  &adapter->status);
+			return ZFCP_ERP_FAILED;
+		}
+
+		wait_event(adapter->erp_ready_wq,
+			   !list_empty(&adapter->erp_ready_head));
+		if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
+			break;
+
+		if (!(atomic_read(&adapter->status) &
+		      ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
+			break;
+
+		ssleep(sleep);
+		sleep *= 2;
+	}
+
+	atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
+			  &adapter->status);
+
+	if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
+		return ZFCP_ERP_FAILED;
+
+	if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
+		zfcp_erp_enqueue_ptp_port(adapter);
+
+	return ZFCP_ERP_SUCCEEDED;
+}
+
+static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
+{
+	int ret;
+	struct zfcp_adapter *adapter = act->adapter;
+
+	write_lock_irq(&adapter->erp_lock);
+	zfcp_erp_action_to_running(act);
+	write_unlock_irq(&adapter->erp_lock);
+
+	ret = zfcp_fsf_exchange_port_data(act);
+	if (ret == -EOPNOTSUPP)
+		return ZFCP_ERP_SUCCEEDED;
+	if (ret)
+		return ZFCP_ERP_FAILED;
+
+	zfcp_dbf_rec_run("erasox1", act);
+	wait_event(adapter->erp_ready_wq,
+		   !list_empty(&adapter->erp_ready_head));
+	zfcp_dbf_rec_run("erasox2", act);
+	if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
+		return ZFCP_ERP_FAILED;
+
+	return ZFCP_ERP_SUCCEEDED;
+}
+
+static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
+{
+	if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
+		return ZFCP_ERP_FAILED;
+
+	if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
+		return ZFCP_ERP_FAILED;
+
+	if (mempool_resize(act->adapter->pool.sr_data,
+			   act->adapter->stat_read_buf_num))
+		return ZFCP_ERP_FAILED;
+
+	if (mempool_resize(act->adapter->pool.status_read_req,
+			   act->adapter->stat_read_buf_num))
+		return ZFCP_ERP_FAILED;
+
+	atomic_set(&act->adapter->stat_miss, act->adapter->stat_read_buf_num);
+	if (zfcp_status_read_refill(act->adapter))
+		return ZFCP_ERP_FAILED;
+
+	return ZFCP_ERP_SUCCEEDED;
+}
+
+static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
+{
+	struct zfcp_adapter *adapter = act->adapter;
+
+	/* close queues to ensure that buffers are not accessed by adapter */
+	zfcp_qdio_close(adapter->qdio);
+	zfcp_fsf_req_dismiss_all(adapter);
+	adapter->fsf_req_seq_no = 0;
+	zfcp_fc_wka_ports_force_offline(adapter->gs);
+	/* all ports and LUNs are closed */
+	zfcp_erp_clear_adapter_status(adapter, ZFCP_STATUS_COMMON_OPEN);
+
+	atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
+			  ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
+}
+
+static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *act)
+{
+	struct zfcp_adapter *adapter = act->adapter;
+
+	if (zfcp_qdio_open(adapter->qdio)) {
+		atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
+				  ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
+				  &adapter->status);
+		return ZFCP_ERP_FAILED;
+	}
+
+	if (zfcp_erp_adapter_strategy_open_fsf(act)) {
+		zfcp_erp_adapter_strategy_close(act);
+		return ZFCP_ERP_FAILED;
+	}
+
+	atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &adapter->status);
+
+	return ZFCP_ERP_SUCCEEDED;
+}
+
+static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
+{
+	struct zfcp_adapter *adapter = act->adapter;
+
+	if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN) {
+		zfcp_erp_adapter_strategy_close(act);
+		if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
+			return ZFCP_ERP_EXIT;
+	}
+
+	if (zfcp_erp_adapter_strategy_open(act)) {
+		ssleep(8);
+		return ZFCP_ERP_FAILED;
+	}
+
+	return ZFCP_ERP_SUCCEEDED;
+}
+
+static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
+{
+	int retval;
+
+	retval = zfcp_fsf_close_physical_port(act);
+	if (retval == -ENOMEM)
+		return ZFCP_ERP_NOMEM;
+	act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
+	if (retval)
+		return ZFCP_ERP_FAILED;
+
+	return ZFCP_ERP_CONTINUES;
+}
+
+static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
+{
+	struct zfcp_port *port = erp_action->port;
+	int status = atomic_read(&port->status);
+
+	switch (erp_action->step) {
+	case ZFCP_ERP_STEP_UNINITIALIZED:
+		if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
+		    (status & ZFCP_STATUS_COMMON_OPEN))
+			return zfcp_erp_port_forced_strategy_close(erp_action);
+		else
+			return ZFCP_ERP_FAILED;
+
+	case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
+		if (!(status & ZFCP_STATUS_PORT_PHYS_OPEN))
+			return ZFCP_ERP_SUCCEEDED;
+	}
+	return ZFCP_ERP_FAILED;
+}
+
+static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
+{
+	int retval;
+
+	retval = zfcp_fsf_close_port(erp_action);
+	if (retval == -ENOMEM)
+		return ZFCP_ERP_NOMEM;
+	erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
+	if (retval)
+		return ZFCP_ERP_FAILED;
+	return ZFCP_ERP_CONTINUES;
+}
+
+static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
+{
+	int retval;
+
+	retval = zfcp_fsf_open_port(erp_action);
+	if (retval == -ENOMEM)
+		return ZFCP_ERP_NOMEM;
+	erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
+	if (retval)
+		return ZFCP_ERP_FAILED;
+	return ZFCP_ERP_CONTINUES;
+}
+
+static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
+{
+	struct zfcp_adapter *adapter = act->adapter;
+	struct zfcp_port *port = act->port;
+
+	if (port->wwpn != adapter->peer_wwpn) {
+		zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED);
+		return ZFCP_ERP_FAILED;
+	}
+	port->d_id = adapter->peer_d_id;
+	return zfcp_erp_port_strategy_open_port(act);
+}
+
+static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
+{
+	struct zfcp_adapter *adapter = act->adapter;
+	struct zfcp_port *port = act->port;
+	int p_status = atomic_read(&port->status);
+
+	switch (act->step) {
+	case ZFCP_ERP_STEP_UNINITIALIZED:
+	case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
+	case ZFCP_ERP_STEP_PORT_CLOSING:
+		if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
+			return zfcp_erp_open_ptp_port(act);
+		if (!port->d_id) {
+			zfcp_fc_trigger_did_lookup(port);
+			return ZFCP_ERP_EXIT;
+		}
+		return zfcp_erp_port_strategy_open_port(act);
+
+	case ZFCP_ERP_STEP_PORT_OPENING:
+		/* D_ID might have changed during open */
+		if (p_status & ZFCP_STATUS_COMMON_OPEN) {
+			if (!port->d_id) {
+				zfcp_fc_trigger_did_lookup(port);
+				return ZFCP_ERP_EXIT;
+			}
+			return ZFCP_ERP_SUCCEEDED;
+		}
+		if (port->d_id && !(p_status & ZFCP_STATUS_COMMON_NOESC)) {
+			port->d_id = 0;
+			return ZFCP_ERP_FAILED;
+		}
+		/* fall through otherwise */
+	}
+	return ZFCP_ERP_FAILED;
+}
+
+static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
+{
+	struct zfcp_port *port = erp_action->port;
+	int p_status = atomic_read(&port->status);
+
+	if ((p_status & ZFCP_STATUS_COMMON_NOESC) &&
+	    !(p_status & ZFCP_STATUS_COMMON_OPEN))
+		goto close_init_done;
+
+	switch (erp_action->step) {
+	case ZFCP_ERP_STEP_UNINITIALIZED:
+		if (p_status & ZFCP_STATUS_COMMON_OPEN)
+			return zfcp_erp_port_strategy_close(erp_action);
+		break;
+
+	case ZFCP_ERP_STEP_PORT_CLOSING:
+		if (p_status & ZFCP_STATUS_COMMON_OPEN)
+			return ZFCP_ERP_FAILED;
+		break;
+	}
+
+close_init_done:
+	if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
+		return ZFCP_ERP_EXIT;
+
+	return zfcp_erp_port_strategy_open_common(erp_action);
+}
+
+static void zfcp_erp_lun_strategy_clearstati(struct scsi_device *sdev)
+{
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+
+	atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED,
+			  &zfcp_sdev->status);
+}
+
+static int zfcp_erp_lun_strategy_close(struct zfcp_erp_action *erp_action)
+{
+	int retval = zfcp_fsf_close_lun(erp_action);
+	if (retval == -ENOMEM)
+		return ZFCP_ERP_NOMEM;
+	erp_action->step = ZFCP_ERP_STEP_LUN_CLOSING;
+	if (retval)
+		return ZFCP_ERP_FAILED;
+	return ZFCP_ERP_CONTINUES;
+}
+
+static int zfcp_erp_lun_strategy_open(struct zfcp_erp_action *erp_action)
+{
+	int retval = zfcp_fsf_open_lun(erp_action);
+	if (retval == -ENOMEM)
+		return ZFCP_ERP_NOMEM;
+	erp_action->step = ZFCP_ERP_STEP_LUN_OPENING;
+	if (retval)
+		return  ZFCP_ERP_FAILED;
+	return ZFCP_ERP_CONTINUES;
+}
+
+static int zfcp_erp_lun_strategy(struct zfcp_erp_action *erp_action)
+{
+	struct scsi_device *sdev = erp_action->sdev;
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+
+	switch (erp_action->step) {
+	case ZFCP_ERP_STEP_UNINITIALIZED:
+		zfcp_erp_lun_strategy_clearstati(sdev);
+		if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
+			return zfcp_erp_lun_strategy_close(erp_action);
+		/* already closed, fall through */
+	case ZFCP_ERP_STEP_LUN_CLOSING:
+		if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
+			return ZFCP_ERP_FAILED;
+		if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
+			return ZFCP_ERP_EXIT;
+		return zfcp_erp_lun_strategy_open(erp_action);
+
+	case ZFCP_ERP_STEP_LUN_OPENING:
+		if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_OPEN)
+			return ZFCP_ERP_SUCCEEDED;
+	}
+	return ZFCP_ERP_FAILED;
+}
+
+static int zfcp_erp_strategy_check_lun(struct scsi_device *sdev, int result)
+{
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+
+	switch (result) {
+	case ZFCP_ERP_SUCCEEDED :
+		atomic_set(&zfcp_sdev->erp_counter, 0);
+		zfcp_erp_lun_unblock(sdev);
+		break;
+	case ZFCP_ERP_FAILED :
+		atomic_inc(&zfcp_sdev->erp_counter);
+		if (atomic_read(&zfcp_sdev->erp_counter) > ZFCP_MAX_ERPS) {
+			dev_err(&zfcp_sdev->port->adapter->ccw_device->dev,
+				"ERP failed for LUN 0x%016Lx on "
+				"port 0x%016Lx\n",
+				(unsigned long long)zfcp_scsi_dev_lun(sdev),
+				(unsigned long long)zfcp_sdev->port->wwpn);
+			zfcp_erp_set_lun_status(sdev,
+						ZFCP_STATUS_COMMON_ERP_FAILED);
+		}
+		break;
+	}
+
+	if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
+		zfcp_erp_lun_block(sdev, 0);
+		result = ZFCP_ERP_EXIT;
+	}
+	return result;
+}
+
+static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
+{
+	switch (result) {
+	case ZFCP_ERP_SUCCEEDED :
+		atomic_set(&port->erp_counter, 0);
+		zfcp_erp_port_unblock(port);
+		break;
+
+	case ZFCP_ERP_FAILED :
+		if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
+			zfcp_erp_port_block(port, 0);
+			result = ZFCP_ERP_EXIT;
+		}
+		atomic_inc(&port->erp_counter);
+		if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
+			dev_err(&port->adapter->ccw_device->dev,
+				"ERP failed for remote port 0x%016Lx\n",
+				(unsigned long long)port->wwpn);
+			zfcp_erp_set_port_status(port,
+					 ZFCP_STATUS_COMMON_ERP_FAILED);
+		}
+		break;
+	}
+
+	if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
+		zfcp_erp_port_block(port, 0);
+		result = ZFCP_ERP_EXIT;
+	}
+	return result;
+}
+
+static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
+					   int result)
+{
+	switch (result) {
+	case ZFCP_ERP_SUCCEEDED :
+		atomic_set(&adapter->erp_counter, 0);
+		zfcp_erp_adapter_unblock(adapter);
+		break;
+
+	case ZFCP_ERP_FAILED :
+		atomic_inc(&adapter->erp_counter);
+		if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
+			dev_err(&adapter->ccw_device->dev,
+				"ERP cannot recover an error "
+				"on the FCP device\n");
+			zfcp_erp_set_adapter_status(adapter,
+					    ZFCP_STATUS_COMMON_ERP_FAILED);
+		}
+		break;
+	}
+
+	if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
+		zfcp_erp_adapter_block(adapter, 0);
+		result = ZFCP_ERP_EXIT;
+	}
+	return result;
+}
+
+static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
+					  int result)
+{
+	struct zfcp_adapter *adapter = erp_action->adapter;
+	struct zfcp_port *port = erp_action->port;
+	struct scsi_device *sdev = erp_action->sdev;
+
+	switch (erp_action->action) {
+
+	case ZFCP_ERP_ACTION_REOPEN_LUN:
+		result = zfcp_erp_strategy_check_lun(sdev, result);
+		break;
+
+	case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
+	case ZFCP_ERP_ACTION_REOPEN_PORT:
+		result = zfcp_erp_strategy_check_port(port, result);
+		break;
+
+	case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
+		result = zfcp_erp_strategy_check_adapter(adapter, result);
+		break;
+	}
+	return result;
+}
+
+static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
+{
+	int status = atomic_read(target_status);
+
+	if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
+	    (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
+		return 1; /* take it online */
+
+	if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
+	    !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
+		return 1; /* take it offline */
+
+	return 0;
+}
+
+static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
+{
+	int action = act->action;
+	struct zfcp_adapter *adapter = act->adapter;
+	struct zfcp_port *port = act->port;
+	struct scsi_device *sdev = act->sdev;
+	struct zfcp_scsi_dev *zfcp_sdev;
+	u32 erp_status = act->status;
+
+	switch (action) {
+	case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
+		if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
+			_zfcp_erp_adapter_reopen(adapter,
+						 ZFCP_STATUS_COMMON_ERP_FAILED,
+						 "ersscg1");
+			return ZFCP_ERP_EXIT;
+		}
+		break;
+
+	case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
+	case ZFCP_ERP_ACTION_REOPEN_PORT:
+		if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
+			_zfcp_erp_port_reopen(port,
+					      ZFCP_STATUS_COMMON_ERP_FAILED,
+					      "ersscg2");
+			return ZFCP_ERP_EXIT;
+		}
+		break;
+
+	case ZFCP_ERP_ACTION_REOPEN_LUN:
+		zfcp_sdev = sdev_to_zfcp(sdev);
+		if (zfcp_erp_strat_change_det(&zfcp_sdev->status, erp_status)) {
+			_zfcp_erp_lun_reopen(sdev,
+					     ZFCP_STATUS_COMMON_ERP_FAILED,
+					     "ersscg3", 0);
+			return ZFCP_ERP_EXIT;
+		}
+		break;
+	}
+	return ret;
+}
+
+static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
+{
+	struct zfcp_adapter *adapter = erp_action->adapter;
+	struct zfcp_scsi_dev *zfcp_sdev;
+
+	adapter->erp_total_count--;
+	if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
+		adapter->erp_low_mem_count--;
+		erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
+	}
+
+	list_del(&erp_action->list);
+	zfcp_dbf_rec_run("eractd1", erp_action);
+
+	switch (erp_action->action) {
+	case ZFCP_ERP_ACTION_REOPEN_LUN:
+		zfcp_sdev = sdev_to_zfcp(erp_action->sdev);
+		atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
+				  &zfcp_sdev->status);
+		break;
+
+	case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
+	case ZFCP_ERP_ACTION_REOPEN_PORT:
+		atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
+				  &erp_action->port->status);
+		break;
+
+	case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
+		atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
+				  &erp_action->adapter->status);
+		break;
+	}
+}
+
+static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
+{
+	struct zfcp_adapter *adapter = act->adapter;
+	struct zfcp_port *port = act->port;
+	struct scsi_device *sdev = act->sdev;
+
+	switch (act->action) {
+	case ZFCP_ERP_ACTION_REOPEN_LUN:
+		if (!(act->status & ZFCP_STATUS_ERP_NO_REF))
+			scsi_device_put(sdev);
+		break;
+
+	case ZFCP_ERP_ACTION_REOPEN_PORT:
+		if (result == ZFCP_ERP_SUCCEEDED)
+			zfcp_scsi_schedule_rport_register(port);
+		/* fall through */
+	case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
+		put_device(&port->dev);
+		break;
+
+	case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
+		if (result == ZFCP_ERP_SUCCEEDED) {
+			register_service_level(&adapter->service_level);
+			zfcp_fc_conditional_port_scan(adapter);
+			queue_work(adapter->work_queue, &adapter->ns_up_work);
+		} else
+			unregister_service_level(&adapter->service_level);
+
+		kref_put(&adapter->ref, zfcp_adapter_release);
+		break;
+	}
+}
+
+static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
+{
+	switch (erp_action->action) {
+	case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
+		return zfcp_erp_adapter_strategy(erp_action);
+	case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
+		return zfcp_erp_port_forced_strategy(erp_action);
+	case ZFCP_ERP_ACTION_REOPEN_PORT:
+		return zfcp_erp_port_strategy(erp_action);
+	case ZFCP_ERP_ACTION_REOPEN_LUN:
+		return zfcp_erp_lun_strategy(erp_action);
+	}
+	return ZFCP_ERP_FAILED;
+}
+
+static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
+{
+	int retval;
+	unsigned long flags;
+	struct zfcp_adapter *adapter = erp_action->adapter;
+
+	kref_get(&adapter->ref);
+
+	write_lock_irqsave(&adapter->erp_lock, flags);
+	zfcp_erp_strategy_check_fsfreq(erp_action);
+
+	if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
+		zfcp_erp_action_dequeue(erp_action);
+		retval = ZFCP_ERP_DISMISSED;
+		goto unlock;
+	}
+
+	if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT) {
+		retval = ZFCP_ERP_FAILED;
+		goto check_target;
+	}
+
+	zfcp_erp_action_to_running(erp_action);
+
+	/* no lock to allow for blocking operations */
+	write_unlock_irqrestore(&adapter->erp_lock, flags);
+	retval = zfcp_erp_strategy_do_action(erp_action);
+	write_lock_irqsave(&adapter->erp_lock, flags);
+
+	if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
+		retval = ZFCP_ERP_CONTINUES;
+
+	switch (retval) {
+	case ZFCP_ERP_NOMEM:
+		if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
+			++adapter->erp_low_mem_count;
+			erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
+		}
+		if (adapter->erp_total_count == adapter->erp_low_mem_count)
+			_zfcp_erp_adapter_reopen(adapter, 0, "erstgy1");
+		else {
+			zfcp_erp_strategy_memwait(erp_action);
+			retval = ZFCP_ERP_CONTINUES;
+		}
+		goto unlock;
+
+	case ZFCP_ERP_CONTINUES:
+		if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
+			--adapter->erp_low_mem_count;
+			erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
+		}
+		goto unlock;
+	}
+
+check_target:
+	retval = zfcp_erp_strategy_check_target(erp_action, retval);
+	zfcp_erp_action_dequeue(erp_action);
+	retval = zfcp_erp_strategy_statechange(erp_action, retval);
+	if (retval == ZFCP_ERP_EXIT)
+		goto unlock;
+	if (retval == ZFCP_ERP_SUCCEEDED)
+		zfcp_erp_strategy_followup_success(erp_action);
+	if (retval == ZFCP_ERP_FAILED)
+		zfcp_erp_strategy_followup_failed(erp_action);
+
+ unlock:
+	write_unlock_irqrestore(&adapter->erp_lock, flags);
+
+	if (retval != ZFCP_ERP_CONTINUES)
+		zfcp_erp_action_cleanup(erp_action, retval);
+
+	kref_put(&adapter->ref, zfcp_adapter_release);
+	return retval;
+}
+
+static int zfcp_erp_thread(void *data)
+{
+	struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
+	struct list_head *next;
+	struct zfcp_erp_action *act;
+	unsigned long flags;
+
+	for (;;) {
+		wait_event_interruptible(adapter->erp_ready_wq,
+			   !list_empty(&adapter->erp_ready_head) ||
+			   kthread_should_stop());
+
+		if (kthread_should_stop())
+			break;
+
+		write_lock_irqsave(&adapter->erp_lock, flags);
+		next = adapter->erp_ready_head.next;
+		write_unlock_irqrestore(&adapter->erp_lock, flags);
+
+		if (next != &adapter->erp_ready_head) {
+			act = list_entry(next, struct zfcp_erp_action, list);
+
+			/* there is more to come after dismission, no notify */
+			if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
+				zfcp_erp_wakeup(adapter);
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * zfcp_erp_thread_setup - Start ERP thread for adapter
+ * @adapter: Adapter to start the ERP thread for
+ *
+ * Returns 0 on success or error code from kernel_thread()
+ */
+int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
+{
+	struct task_struct *thread;
+
+	thread = kthread_run(zfcp_erp_thread, adapter, "zfcperp%s",
+			     dev_name(&adapter->ccw_device->dev));
+	if (IS_ERR(thread)) {
+		dev_err(&adapter->ccw_device->dev,
+			"Creating an ERP thread for the FCP device failed.\n");
+		return PTR_ERR(thread);
+	}
+
+	adapter->erp_thread = thread;
+	return 0;
+}
+
+/**
+ * zfcp_erp_thread_kill - Stop ERP thread.
+ * @adapter: Adapter where the ERP thread should be stopped.
+ *
+ * The caller of this routine ensures that the specified adapter has
+ * been shut down and that this operation has been completed. Thus,
+ * there are no pending erp_actions which would need to be handled
+ * here.
+ */
+void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
+{
+	kthread_stop(adapter->erp_thread);
+	adapter->erp_thread = NULL;
+	WARN_ON(!list_empty(&adapter->erp_ready_head));
+	WARN_ON(!list_empty(&adapter->erp_running_head));
+}
+
+/**
+ * zfcp_erp_wait - wait for completion of error recovery on an adapter
+ * @adapter: adapter for which to wait for completion of its error recovery
+ */
+void zfcp_erp_wait(struct zfcp_adapter *adapter)
+{
+	wait_event(adapter->erp_done_wqh,
+		   !(atomic_read(&adapter->status) &
+			ZFCP_STATUS_ADAPTER_ERP_PENDING));
+}
+
+/**
+ * zfcp_erp_set_adapter_status - set adapter status bits
+ * @adapter: adapter to change the status
+ * @mask: status bits to change
+ *
+ * Changes in common status bits are propagated to attached ports and LUNs.
+ */
+void zfcp_erp_set_adapter_status(struct zfcp_adapter *adapter, u32 mask)
+{
+	struct zfcp_port *port;
+	struct scsi_device *sdev;
+	unsigned long flags;
+	u32 common_mask = mask & ZFCP_COMMON_FLAGS;
+
+	atomic_set_mask(mask, &adapter->status);
+
+	if (!common_mask)
+		return;
+
+	read_lock_irqsave(&adapter->port_list_lock, flags);
+	list_for_each_entry(port, &adapter->port_list, list)
+		atomic_set_mask(common_mask, &port->status);
+	read_unlock_irqrestore(&adapter->port_list_lock, flags);
+
+	spin_lock_irqsave(adapter->scsi_host->host_lock, flags);
+	__shost_for_each_device(sdev, adapter->scsi_host)
+		atomic_set_mask(common_mask, &sdev_to_zfcp(sdev)->status);
+	spin_unlock_irqrestore(adapter->scsi_host->host_lock, flags);
+}
+
+/**
+ * zfcp_erp_clear_adapter_status - clear adapter status bits
+ * @adapter: adapter to change the status
+ * @mask: status bits to change
+ *
+ * Changes in common status bits are propagated to attached ports and LUNs.
+ */
+void zfcp_erp_clear_adapter_status(struct zfcp_adapter *adapter, u32 mask)
+{
+	struct zfcp_port *port;
+	struct scsi_device *sdev;
+	unsigned long flags;
+	u32 common_mask = mask & ZFCP_COMMON_FLAGS;
+	u32 clear_counter = mask & ZFCP_STATUS_COMMON_ERP_FAILED;
+
+	atomic_clear_mask(mask, &adapter->status);
+
+	if (!common_mask)
+		return;
+
+	if (clear_counter)
+		atomic_set(&adapter->erp_counter, 0);
+
+	read_lock_irqsave(&adapter->port_list_lock, flags);
+	list_for_each_entry(port, &adapter->port_list, list) {
+		atomic_clear_mask(common_mask, &port->status);
+		if (clear_counter)
+			atomic_set(&port->erp_counter, 0);
+	}
+	read_unlock_irqrestore(&adapter->port_list_lock, flags);
+
+	spin_lock_irqsave(adapter->scsi_host->host_lock, flags);
+	__shost_for_each_device(sdev, adapter->scsi_host) {
+		atomic_clear_mask(common_mask, &sdev_to_zfcp(sdev)->status);
+		if (clear_counter)
+			atomic_set(&sdev_to_zfcp(sdev)->erp_counter, 0);
+	}
+	spin_unlock_irqrestore(adapter->scsi_host->host_lock, flags);
+}
+
+/**
+ * zfcp_erp_set_port_status - set port status bits
+ * @port: port to change the status
+ * @mask: status bits to change
+ *
+ * Changes in common status bits are propagated to attached LUNs.
+ */
+void zfcp_erp_set_port_status(struct zfcp_port *port, u32 mask)
+{
+	struct scsi_device *sdev;
+	u32 common_mask = mask & ZFCP_COMMON_FLAGS;
+	unsigned long flags;
+
+	atomic_set_mask(mask, &port->status);
+
+	if (!common_mask)
+		return;
+
+	spin_lock_irqsave(port->adapter->scsi_host->host_lock, flags);
+	__shost_for_each_device(sdev, port->adapter->scsi_host)
+		if (sdev_to_zfcp(sdev)->port == port)
+			atomic_set_mask(common_mask,
+					&sdev_to_zfcp(sdev)->status);
+	spin_unlock_irqrestore(port->adapter->scsi_host->host_lock, flags);
+}
+
+/**
+ * zfcp_erp_clear_port_status - clear port status bits
+ * @port: adapter to change the status
+ * @mask: status bits to change
+ *
+ * Changes in common status bits are propagated to attached LUNs.
+ */
+void zfcp_erp_clear_port_status(struct zfcp_port *port, u32 mask)
+{
+	struct scsi_device *sdev;
+	u32 common_mask = mask & ZFCP_COMMON_FLAGS;
+	u32 clear_counter = mask & ZFCP_STATUS_COMMON_ERP_FAILED;
+	unsigned long flags;
+
+	atomic_clear_mask(mask, &port->status);
+
+	if (!common_mask)
+		return;
+
+	if (clear_counter)
+		atomic_set(&port->erp_counter, 0);
+
+	spin_lock_irqsave(port->adapter->scsi_host->host_lock, flags);
+	__shost_for_each_device(sdev, port->adapter->scsi_host)
+		if (sdev_to_zfcp(sdev)->port == port) {
+			atomic_clear_mask(common_mask,
+					  &sdev_to_zfcp(sdev)->status);
+			if (clear_counter)
+				atomic_set(&sdev_to_zfcp(sdev)->erp_counter, 0);
+		}
+	spin_unlock_irqrestore(port->adapter->scsi_host->host_lock, flags);
+}
+
+/**
+ * zfcp_erp_set_lun_status - set lun status bits
+ * @sdev: SCSI device / lun to set the status bits
+ * @mask: status bits to change
+ */
+void zfcp_erp_set_lun_status(struct scsi_device *sdev, u32 mask)
+{
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+
+	atomic_set_mask(mask, &zfcp_sdev->status);
+}
+
+/**
+ * zfcp_erp_clear_lun_status - clear lun status bits
+ * @sdev: SCSi device / lun to clear the status bits
+ * @mask: status bits to change
+ */
+void zfcp_erp_clear_lun_status(struct scsi_device *sdev, u32 mask)
+{
+	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+
+	atomic_clear_mask(mask, &zfcp_sdev->status);
+
+	if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
+		atomic_set(&zfcp_sdev->erp_counter, 0);
+}
+