isci: kill device_sequence

Now that we have upleveled device reassignment protection to the
isci_remote_device reference count we no longer need this level of
self-defense.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

5 files changed, 0 insertions, 36 deletions

diff --git a/drivers/scsi/isci/host.h b/drivers/scsi/isci/host.h
index 94fd54dc9f01..a54397e1bf16 100644
--- a/drivers/scsi/isci/host.h
+++ b/drivers/scsi/isci/host.h
@@ -188,15 +188,6 @@ struct scic_sds_controller {
         u8 io_request_sequence[SCI_MAX_IO_REQUESTS];
 
         /**
-         * This field in the array of sequence values for the RNi.  These are used
-         * to control io request build to io request start operations.  The sequence
-         * value is recorded into an io request when it is built and is checked on
-         * the io request start operation to make sure that there was not a device
-         * hot plug between the build and start operation.
-         */
-        u8 remote_device_sequence[SCI_MAX_REMOTE_DEVICES];
-
-        /**
          * This field is a pointer to the memory allocated by the driver for the task
          * context table.  This data is shared between the hardware and software.
          */
diff --git a/drivers/scsi/isci/remote_device.c b/drivers/scsi/isci/remote_device.c
index c2e5c05be0cb..9f45c2ba7307 100644
--- a/drivers/scsi/isci/remote_device.c
+++ b/drivers/scsi/isci/remote_device.c
@@ -887,8 +887,6 @@ static void scic_sds_remote_device_ready_state_enter(struct sci_base_state_machi
         struct isci_remote_device *idev = sci_dev_to_idev(sci_dev);
         struct domain_device *dev = idev->domain_dev;
 
-        scic->remote_device_sequence[sci_dev->rnc.remote_node_index]++;
-
         if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_SATA)) {
                 sci_change_state(&sci_dev->sm, SCI_STP_DEV_IDLE);
         } else if (dev_is_expander(dev)) {
diff --git a/drivers/scsi/isci/remote_device.h b/drivers/scsi/isci/remote_device.h
index 33f011447312..cde595078f6d 100644
--- a/drivers/scsi/isci/remote_device.h
+++ b/drivers/scsi/isci/remote_device.h
@@ -411,17 +411,6 @@ static inline bool dev_is_expander(struct domain_device *dev)
         ((sci_dev)->owning_port)
 
 /**
- * scic_sds_remote_device_get_sequence() -
- *
- * This macro returns the remote device sequence value
- */
-#define scic_sds_remote_device_get_sequence(sci_dev) \
-        (\
-                scic_sds_remote_device_get_controller(sci_dev)-> \
-                remote_device_sequence[(sci_dev)->rnc.remote_node_index] \
-        )
-
-/**
  * scic_sds_remote_device_get_controller_peg() -
  *
  * This macro returns the controllers protocol engine group
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
index fd6314abeb0b..ebe160c83f91 100644
--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -753,10 +753,6 @@ enum sci_status scic_sds_request_start(struct scic_sds_request *sci_req)
         struct scu_task_context *task_context;
         enum sci_base_request_states state;
 
-        if (sci_req->device_sequence !=
-            scic_sds_remote_device_get_sequence(sci_req->target_device))
-                return SCI_FAILURE;
-
         state = sci_req->sm.current_state_id;
         if (state != SCI_REQ_CONSTRUCTED) {
                 dev_warn(scic_to_dev(scic),
@@ -3112,7 +3108,6 @@ scic_sds_general_request_construct(struct scic_sds_controller *scic,
         sci_req->target_device = sci_dev;
         sci_req->protocol = SCIC_NO_PROTOCOL;
         sci_req->saved_rx_frame_index = SCU_INVALID_FRAME_INDEX;
-        sci_req->device_sequence = scic_sds_remote_device_get_sequence(sci_dev);
 
         sci_req->sci_status   = SCI_SUCCESS;
         sci_req->scu_status   = 0;
diff --git a/drivers/scsi/isci/request.h b/drivers/scsi/isci/request.h
index 9bb7c36257f3..a91d1d6060ce 100644
--- a/drivers/scsi/isci/request.h
+++ b/drivers/scsi/isci/request.h
@@ -231,14 +231,6 @@ struct scic_sds_request {
          */
         u32 saved_rx_frame_index;
 
-        /*
-         * This field in the recorded device sequence for the io request.
-         * This is recorded during the build operation and is compared in the
-         * start operation.  If the sequence is different then there was a
-         * change of devices from the build to start operations.
-         */
-        u8 device_sequence;
-
         union {
                 struct {
                         union {
@@ -262,7 +254,6 @@ struct scic_sds_request {
                         struct dev_to_host_fis rsp;
                 } stp;
         };
-
 };
 
 static inline struct scic_sds_request *to_sci_req(struct scic_sds_stp_request *stp_req)