isci: Intel(R) C600 Series Chipset Storage Control Unit Driver

Support for the up to 2x4-port 6Gb/s SAS controllers embedded in the
chipset.

This is a snapshot of the first publicly available version of the driver,
commit 4c1db2d0 in the 'historical' branch.

   git://git.kernel.org/pub/scm/linux/kernel/git/djbw/isci.git historical

Signed-off-by: Maciej Trela <maciej.trela@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Edmund Nadolski <edmund.nadolski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 698 insertions, 0 deletions

diff --git a/drivers/scsi/isci/remote_device.c b/drivers/scsi/isci/remote_device.c
new file mode 100644
index 000000000000..dbf3c82f6195
--- /dev/null
+++ b/drivers/scsi/isci/remote_device.c
@@ -0,0 +1,698 @@
+/*
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in
+ *     the documentation and/or other materials provided with the
+ *     distribution.
+ *   * Neither the name of Intel Corporation nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "isci.h"
+#include "scic_io_request.h"
+#include "scic_remote_device.h"
+#include "scic_phy.h"
+#include "scic_port.h"
+#include "port.h"
+#include "remote_device.h"
+#include "request.h"
+#include "task.h"
+
+
+
+/**
+ * isci_remote_device_deconstruct() - This function frees an isci_remote_device.
+ * @isci_host: This parameter specifies the isci host object.
+ * @isci_device: This parameter specifies the remote device to be freed.
+ *
+ */
+static void isci_remote_device_deconstruct(
+	struct isci_host *isci_host,
+	struct isci_remote_device *isci_device)
+{
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_device = %p\n", __func__, isci_device);
+
+	/* There should not be any outstanding io's. All paths to
+	 * here should go through isci_remote_device_nuke_requests.
+	 * If we hit this condition, we will need a way to complete
+	 * io requests in process */
+	while (!list_empty(&isci_device->reqs_in_process)) {
+
+		dev_err(&isci_host->pdev->dev,
+			"%s: ** request list not empty! **\n", __func__);
+		BUG();
+	}
+
+	/* Remove all related references to this device and free
+	 * the cache object.
+	 */
+	scic_remote_device_destruct(isci_device->sci_device_handle);
+	isci_device->domain_dev->lldd_dev = NULL;
+	list_del(&isci_device->node);
+	kmem_cache_free(isci_kmem_cache, isci_device);
+}
+
+
+/**
+ * isci_remote_device_construct() - This function calls the scic remote device
+ *    construct and start functions, it waits on the remote device start
+ *    completion.
+ * @port: This parameter specifies the isci port with the remote device.
+ * @isci_device: This parameter specifies the isci remote device
+ *
+ * status from the scic calls, the caller to this function should clean up
+ * resources as appropriate.
+ */
+static enum sci_status isci_remote_device_construct(
+	struct isci_port *port,
+	struct isci_remote_device *isci_device)
+{
+	enum sci_status status = SCI_SUCCESS;
+
+	/* let the core do it's common constuction. */
+	scic_remote_device_construct(port->sci_port_handle,
+				     isci_device->sci_device_handle);
+
+	/* let the core do it's device specific constuction. */
+	if (isci_device->domain_dev->parent &&
+	    (isci_device->domain_dev->parent->dev_type == EDGE_DEV)) {
+		int i;
+
+		/* struct smp_response_discover discover_response; */
+		struct discover_resp discover_response;
+		struct domain_device *parent =
+			isci_device->domain_dev->parent;
+
+		struct expander_device *parent_ex = &parent->ex_dev;
+
+		for (i = 0; i < parent_ex->num_phys; i++) {
+
+			struct ex_phy *phy = &parent_ex->ex_phy[i];
+
+			if ((phy->phy_state == PHY_VACANT) ||
+			    (phy->phy_state == PHY_NOT_PRESENT))
+				continue;
+
+			if (SAS_ADDR(phy->attached_sas_addr)
+			    == SAS_ADDR(isci_device->domain_dev->sas_addr)) {
+
+				discover_response.attached_dev_type
+					= phy->attached_dev_type;
+				discover_response.linkrate
+					= phy->linkrate;
+				discover_response.attached_sata_host
+					= phy->attached_sata_host;
+				discover_response.attached_sata_dev
+					= phy->attached_sata_dev;
+				discover_response.attached_sata_ps
+					= phy->attached_sata_ps;
+				discover_response.iproto
+					= phy->attached_iproto >> 1;
+				discover_response.tproto
+					= phy->attached_tproto >> 1;
+				memcpy(
+					discover_response.attached_sas_addr,
+					phy->attached_sas_addr,
+					SAS_ADDR_SIZE
+					);
+				discover_response.attached_phy_id
+					= phy->attached_phy_id;
+				discover_response.change_count
+					= phy->phy_change_count;
+				discover_response.routing_attr
+					= phy->routing_attr;
+				discover_response.hmin_linkrate
+					= phy->phy->minimum_linkrate_hw;
+				discover_response.hmax_linkrate
+					= phy->phy->maximum_linkrate_hw;
+				discover_response.pmin_linkrate
+					= phy->phy->minimum_linkrate;
+				discover_response.pmax_linkrate
+					= phy->phy->maximum_linkrate;
+			}
+		}
+
+
+		dev_dbg(&port->isci_host->pdev->dev,
+			"%s: parent->dev_type = EDGE_DEV\n",
+			__func__);
+
+		status = scic_remote_device_ea_construct(
+			isci_device->sci_device_handle,
+			(struct smp_response_discover *)&discover_response
+			);
+
+	} else
+		status = scic_remote_device_da_construct(
+			isci_device->sci_device_handle
+			);
+
+
+	if (status != SCI_SUCCESS) {
+		dev_dbg(&port->isci_host->pdev->dev,
+			"%s: scic_remote_device_da_construct failed - "
+			"isci_device = %p\n",
+			__func__,
+			isci_device);
+
+		return status;
+	}
+
+	sci_object_set_association(
+		isci_device->sci_device_handle,
+		isci_device
+		);
+
+	BUG_ON(port->isci_host == NULL);
+
+	/* start the device. */
+	status = scic_remote_device_start(
+		isci_device->sci_device_handle,
+		ISCI_REMOTE_DEVICE_START_TIMEOUT
+		);
+
+	if (status != SCI_SUCCESS) {
+		dev_warn(&port->isci_host->pdev->dev,
+			 "%s: scic_remote_device_start failed\n",
+			 __func__);
+		return status;
+	}
+
+	return status;
+}
+
+
+/**
+ * isci_remote_device_nuke_requests() - This function terminates all requests
+ *    for a given remote device.
+ * @isci_device: This parameter specifies the remote device
+ *
+ */
+void isci_remote_device_nuke_requests(
+	struct isci_remote_device *isci_device)
+{
+	DECLARE_COMPLETION_ONSTACK(aborted_task_completion);
+	struct isci_host *isci_host;
+
+	isci_host = isci_device->isci_port->isci_host;
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_device = %p\n", __func__, isci_device);
+
+	/* Cleanup all requests pending for this device. */
+	isci_terminate_pending_requests(isci_host, isci_device, terminating);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_device = %p, done\n", __func__, isci_device);
+}
+
+
+
+/**
+ * This function builds the isci_remote_device when a libsas dev_found message
+ *    is received.
+ * @isci_host: This parameter specifies the isci host object.
+ * @port: This parameter specifies the isci_port conected to this device.
+ *
+ * pointer to new isci_remote_device.
+ */
+static struct isci_remote_device *
+isci_remote_device_alloc(struct isci_host *isci_host, struct isci_port *port)
+{
+	struct isci_remote_device *isci_device;
+	struct scic_sds_remote_device *sci_dev;
+
+	isci_device = kmem_cache_zalloc(isci_kmem_cache, GFP_KERNEL);
+
+	if (!isci_device) {
+		dev_warn(&isci_host->pdev->dev, "%s: failed\n", __func__);
+		return NULL;
+	}
+
+	sci_dev = (struct scic_sds_remote_device *) &isci_device[1];
+	isci_device->sci_device_handle = sci_dev;
+	INIT_LIST_HEAD(&isci_device->reqs_in_process);
+	INIT_LIST_HEAD(&isci_device->node);
+	isci_device->host_quiesce          = false;
+
+	spin_lock_init(&isci_device->state_lock);
+	spin_lock_init(&isci_device->host_quiesce_lock);
+	isci_remote_device_change_state(isci_device, isci_freed);
+
+	return isci_device;
+
+}
+/**
+ * isci_device_set_host_quiesce_lock_state() - This function sets the host I/O
+ *    quiesce lock state for the remote_device object.
+ * @isci_device,: This parameter points to the isci_remote_device object
+ * @isci_device: This parameter specifies the new quiesce state.
+ *
+ */
+void isci_device_set_host_quiesce_lock_state(
+	struct isci_remote_device *isci_device,
+	bool lock_state)
+{
+	unsigned long flags;
+
+	dev_dbg(&isci_device->isci_port->isci_host->pdev->dev,
+		"%s: isci_device=%p, lock_state=%d\n",
+		__func__, isci_device, lock_state);
+
+	spin_lock_irqsave(&isci_device->host_quiesce_lock, flags);
+	isci_device->host_quiesce = lock_state;
+	spin_unlock_irqrestore(&isci_device->host_quiesce_lock, flags);
+}
+
+/**
+ * isci_remote_device_ready() - This function is called by the scic when the
+ *    remote device is ready. We mark the isci device as ready and signal the
+ *    waiting proccess.
+ * @isci_host: This parameter specifies the isci host object.
+ * @isci_device: This parameter specifies the remote device
+ *
+ */
+void isci_remote_device_ready(struct isci_remote_device *isci_device)
+{
+	unsigned long flags;
+
+	dev_dbg(&isci_device->isci_port->isci_host->pdev->dev,
+		"%s: isci_device = %p\n", __func__, isci_device);
+
+	/* device ready is actually a "ready for io" state. */
+	if ((isci_starting == isci_remote_device_get_state(isci_device)) ||
+	    (isci_ready == isci_remote_device_get_state(isci_device))) {
+		spin_lock_irqsave(&isci_device->isci_port->remote_device_lock,
+				  flags);
+		isci_remote_device_change_state(isci_device, isci_ready_for_io);
+		if (isci_device->completion)
+			complete(isci_device->completion);
+		spin_unlock_irqrestore(
+				&isci_device->isci_port->remote_device_lock,
+				flags);
+	}
+
+}
+
+/**
+ * isci_remote_device_not_ready() - This function is called by the scic when
+ *    the remote device is not ready. We mark the isci device as ready (not
+ *    "ready_for_io") and signal the waiting proccess.
+ * @isci_host: This parameter specifies the isci host object.
+ * @isci_device: This parameter specifies the remote device
+ *
+ */
+void isci_remote_device_not_ready(
+	struct isci_remote_device *isci_device,
+	u32 reason_code)
+{
+	dev_dbg(&isci_device->isci_port->isci_host->pdev->dev,
+		"%s: isci_device = %p\n", __func__, isci_device);
+
+	if (reason_code == SCIC_REMOTE_DEVICE_NOT_READY_STOP_REQUESTED)
+		isci_remote_device_change_state(isci_device, isci_stopping);
+	else
+		/* device ready is actually a "not ready for io" state. */
+		isci_remote_device_change_state(isci_device, isci_ready);
+}
+
+/**
+ * isci_remote_device_stop_complete() - This function is called by the scic
+ *    when the remote device stop has completed. We mark the isci device as not
+ *    ready and remove the isci remote device.
+ * @isci_host: This parameter specifies the isci host object.
+ * @isci_device: This parameter specifies the remote device.
+ * @status: This parameter specifies status of the completion.
+ *
+ */
+void isci_remote_device_stop_complete(
+	struct isci_host *isci_host,
+	struct isci_remote_device *isci_device,
+	enum sci_status status)
+{
+	struct completion *completion = isci_device->completion;
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: complete isci_device = %p, status = 0x%x\n",
+		__func__,
+		isci_device,
+		status);
+
+	isci_remote_device_change_state(isci_device, isci_stopped);
+
+	/* after stop, we can tear down resources. */
+	isci_remote_device_deconstruct(isci_host, isci_device);
+
+	/* notify interested parties. */
+	if (completion)
+		complete(completion);
+}
+
+/**
+ * isci_remote_device_start_complete() - This function is called by the scic
+ *    when the remote device start has completed
+ * @isci_host: This parameter specifies the isci host object.
+ * @isci_device: This parameter specifies the remote device.
+ * @status: This parameter specifies status of the completion.
+ *
+ */
+void isci_remote_device_start_complete(
+	struct isci_host *isci_host,
+	struct isci_remote_device *isci_device,
+	enum sci_status status)
+{
+
+
+}
+
+
+/**
+ * isci_remote_device_stop() - This function is called internally to stop the
+ *    remote device.
+ * @isci_host: This parameter specifies the isci host object.
+ * @isci_device: This parameter specifies the remote device.
+ *
+ * The status of the scic request to stop.
+ */
+enum sci_status isci_remote_device_stop(
+	struct isci_remote_device *isci_device)
+{
+	enum sci_status status;
+	unsigned long flags;
+
+	DECLARE_COMPLETION_ONSTACK(completion);
+
+	dev_dbg(&isci_device->isci_port->isci_host->pdev->dev,
+		"%s: isci_device = %p\n", __func__, isci_device);
+
+	isci_remote_device_change_state(isci_device, isci_stopping);
+
+	/* We need comfirmation that stop completed. */
+	isci_device->completion = &completion;
+
+	BUG_ON(isci_device->isci_port == NULL);
+	BUG_ON(isci_device->isci_port->isci_host == NULL);
+
+	spin_lock_irqsave(&isci_device->isci_port->isci_host->scic_lock, flags);
+
+	status = scic_remote_device_stop(
+		isci_device->sci_device_handle,
+		50
+		);
+
+	spin_unlock_irqrestore(&isci_device->isci_port->isci_host->scic_lock, flags);
+
+	/* Wait for the stop complete callback. */
+	if (status == SCI_SUCCESS)
+		wait_for_completion(&completion);
+
+	dev_dbg(&isci_device->isci_port->isci_host->pdev->dev,
+		"%s: isci_device = %p - after completion wait\n",
+		__func__, isci_device);
+
+	isci_device->completion = NULL;
+	return status;
+}
+
+/**
+ * isci_remote_device_gone() - This function is called by libsas when a domain
+ *    device is removed.
+ * @domain_device: This parameter specifies the libsas domain device.
+ *
+ */
+void isci_remote_device_gone(
+	struct domain_device *domain_dev)
+{
+	struct isci_remote_device *isci_device = isci_dev_from_domain_dev(
+		domain_dev);
+
+	dev_err(&isci_device->isci_port->isci_host->pdev->dev,
+		"%s: domain_device = %p, isci_device = %p, isci_port = %p\n",
+		__func__, domain_dev, isci_device, isci_device->isci_port);
+
+	if (isci_device != NULL)
+		isci_remote_device_stop(isci_device);
+}
+
+
+/**
+ * isci_remote_device_found() - This function is called by libsas when a remote
+ *    device is discovered. A remote device object is created and started. the
+ *    function then sleeps until the sci core device started message is
+ *    received.
+ * @domain_device: This parameter specifies the libsas domain device.
+ *
+ * status, zero indicates success.
+ */
+int isci_remote_device_found(struct domain_device *domain_dev)
+{
+	unsigned long flags;
+	struct isci_host *isci_host;
+	struct isci_port *isci_port;
+	struct isci_phy *isci_phy;
+	struct asd_sas_port *sas_port;
+	struct asd_sas_phy *sas_phy;
+	struct isci_remote_device *isci_device;
+	enum sci_status status;
+	DECLARE_COMPLETION_ONSTACK(completion);
+
+	isci_host = isci_host_from_sas_ha(domain_dev->port->ha);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: domain_device = %p\n", __func__, domain_dev);
+
+	sas_port = domain_dev->port;
+	sas_phy = list_first_entry(&sas_port->phy_list, struct asd_sas_phy,
+				   port_phy_el);
+	isci_phy = to_isci_phy(sas_phy);
+	isci_port = isci_phy->isci_port;
+
+	/* we are being called for a device on this port,
+	 * so it has to come up eventually
+	 */
+	wait_for_completion(&isci_port->start_complete);
+
+	if ((isci_stopping == isci_port_get_state(isci_port)) ||
+	    (isci_stopped == isci_port_get_state(isci_port)))
+		return -ENODEV;
+
+	isci_device = isci_remote_device_alloc(isci_host, isci_port);
+
+	INIT_LIST_HEAD(&isci_device->node);
+	domain_dev->lldd_dev = isci_device;
+	isci_device->domain_dev = domain_dev;
+	isci_device->isci_port = isci_port;
+	isci_remote_device_change_state(isci_device, isci_starting);
+
+
+	spin_lock_irqsave(&isci_port->remote_device_lock, flags);
+	list_add_tail(&isci_device->node, &isci_port->remote_dev_list);
+
+	/* for the device ready event. */
+	isci_device->completion = &completion;
+
+	status = isci_remote_device_construct(isci_port, isci_device);
+
+	spin_unlock_irqrestore(&isci_port->remote_device_lock, flags);
+
+	/* wait for the device ready callback. */
+	wait_for_completion(isci_device->completion);
+	isci_device->completion = NULL;
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_device = %p\n",
+		__func__, isci_device);
+
+	if (status != SCI_SUCCESS) {
+
+		spin_lock_irqsave(&isci_port->remote_device_lock, flags);
+		isci_remote_device_deconstruct(
+			isci_host,
+			isci_device
+			);
+		spin_unlock_irqrestore(&isci_port->remote_device_lock, flags);
+		return -ENODEV;
+	}
+
+	wait_for_completion(&isci_host->start_complete);
+
+	return 0;
+}
+/**
+ * isci_device_is_reset_pending() - This function will check if there is any
+ *    pending reset condition on the device.
+ * @request: This parameter is the isci_device object.
+ *
+ * true if there is a reset pending for the device.
+ */
+bool isci_device_is_reset_pending(
+	struct isci_host *isci_host,
+	struct isci_remote_device *isci_device)
+{
+	struct isci_request *isci_request;
+	struct isci_request *tmp_req;
+	bool reset_is_pending = false;
+	unsigned long flags;
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_device = %p\n", __func__, isci_device);
+
+	spin_lock_irqsave(&isci_host->scic_lock, flags);
+
+	/* Check for reset on all pending requests. */
+	list_for_each_entry_safe(isci_request, tmp_req,
+				 &isci_device->reqs_in_process, dev_node) {
+		dev_dbg(&isci_host->pdev->dev,
+			"%s: isci_device = %p request = %p\n",
+			__func__, isci_device, isci_request);
+
+		if (isci_request->ttype == io_task) {
+
+			unsigned long flags;
+			struct sas_task *task = isci_request_access_task(
+				isci_request);
+
+			spin_lock_irqsave(&task->task_state_lock, flags);
+			if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET)
+				reset_is_pending = true;
+			spin_unlock_irqrestore(&task->task_state_lock, flags);
+		}
+	}
+
+	spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+
+	dev_dbg(&isci_host->pdev->dev,
+		"%s: isci_device = %p reset_is_pending = %d\n",
+		__func__, isci_device, reset_is_pending);
+
+	return reset_is_pending;
+}
+
+/**
+ * isci_device_clear_reset_pending() - This function will clear if any pending
+ *    reset condition flags on the device.
+ * @request: This parameter is the isci_device object.
+ *
+ * true if there is a reset pending for the device.
+ */
+void isci_device_clear_reset_pending(struct isci_remote_device *isci_device)
+{
+	struct isci_request *isci_request;
+	struct isci_request *tmp_req;
+	struct isci_host *isci_host = NULL;
+	unsigned long flags = 0;
+
+	/* FIXME more port gone confusion, and this time it makes the
+	 * locking "fun"
+	 */
+	if (isci_device->isci_port != NULL)
+		isci_host = isci_device->isci_port->isci_host;
+
+	/*
+	 * FIXME when the isci_host gets sorted out
+	 * use dev_dbg()
+	 */
+	pr_debug("%s: isci_device=%p, isci_host=%p\n",
+		 __func__, isci_device, isci_host);
+
+	if (isci_host != NULL)
+		spin_lock_irqsave(&isci_host->scic_lock, flags);
+	else
+		pr_err("%s: isci_device %p; isci_host == NULL!\n",
+		       __func__, isci_device);
+
+	/* Clear reset pending on all pending requests. */
+	list_for_each_entry_safe(isci_request, tmp_req,
+				 &isci_device->reqs_in_process, dev_node) {
+		/*
+		 * FIXME when the conditional spinlock is gone
+		 * change to dev_dbg()
+		 */
+		pr_debug("%s: isci_device = %p request = %p\n",
+			 __func__, isci_device, isci_request);
+
+		if (isci_request->ttype == io_task) {
+
+			unsigned long flags2;
+			struct sas_task *task = isci_request_access_task(
+				isci_request);
+
+			spin_lock_irqsave(&task->task_state_lock, flags2);
+			task->task_state_flags &= ~SAS_TASK_NEED_DEV_RESET;
+			spin_unlock_irqrestore(&task->task_state_lock, flags2);
+		}
+	}
+
+	if (isci_host != NULL)
+		spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+}
+
+/**
+ * isci_remote_device_change_state() - This function gets the status of the
+ *    remote_device object.
+ * @isci_device: This parameter points to the isci_remote_device object
+ *
+ * status of the object as a isci_status enum.
+ */
+void isci_remote_device_change_state(
+	struct isci_remote_device *isci_device,
+	enum isci_status status)
+{
+	unsigned long flags;
+
+	dev_dbg(&isci_device->isci_port->isci_host->pdev->dev,
+		"%s: isci_device = %p, state = 0x%x",
+		__func__,
+		isci_device,
+		status);
+
+	spin_lock_irqsave(&isci_device->state_lock, flags);
+	isci_device->status = status;
+	spin_unlock_irqrestore(&isci_device->state_lock, flags);
+}