isci: Remove obviated host callback list.

Since the callbacks to libsas now occur under scic_lock, there is no
longer any reason to save the completed requests in a separate list
for completion to libsas.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

5 files changed, 31 insertions, 66 deletions

diff --git a/drivers/scsi/isci/host.c b/drivers/scsi/isci/host.c
index ef2790faeab8..45385f531649 100644
--- a/drivers/scsi/isci/host.c
+++ b/drivers/scsi/isci/host.c
@@ -1077,6 +1077,32 @@ static void sci_controller_completion_handler(struct isci_host *ihost)
         writel(0, &ihost->smu_registers->interrupt_mask);
 }
 
+void ireq_done(struct isci_host *ihost, struct isci_request *ireq, struct sas_task *task)
+{
+        task->lldd_task = NULL;
+        if (!test_bit(IREQ_ABORT_PATH_ACTIVE, &ireq->flags) &&
+            !(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
+                if (test_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags)) {
+                        /* Normal notification (task_done) */
+                        dev_dbg(&ihost->pdev->dev,
+                                "%s: Normal - ireq/task = %p/%p\n",
+                                __func__, ireq, task);
+
+                        task->task_done(task);
+                } else {
+                        dev_dbg(&ihost->pdev->dev,
+                                "%s: Error - ireq/task = %p/%p\n",
+                                __func__, ireq, task);
+
+                        sas_task_abort(task);
+                }
+        }
+        if (test_and_clear_bit(IREQ_ABORT_PATH_ACTIVE, &ireq->flags))
+                wake_up_all(&ihost->eventq);
+
+        if (!test_bit(IREQ_NO_AUTO_FREE_TAG, &ireq->flags))
+                isci_free_tag(ihost, ireq->io_tag);
+}
 /**
  * isci_host_completion_routine() - This function is the delayed service
  *    routine that calls the sci core library's completion handler. It's
@@ -1088,62 +1114,10 @@ static void sci_controller_completion_handler(struct isci_host *ihost)
 void isci_host_completion_routine(unsigned long data)
 {
         struct isci_host *ihost = (struct isci_host *)data;
-        struct list_head    completed_request_list;
-        struct list_head    *current_position;
-        struct list_head    *next_position;
-        struct isci_request *request;
-        struct sas_task     *task;
         u16 active;
 
-        INIT_LIST_HEAD(&completed_request_list);
-
         spin_lock_irq(&ihost->scic_lock);
-
         sci_controller_completion_handler(ihost);
-
-        /* Take the lists of completed I/Os from the host. */
-        list_splice_init(&ihost->requests_to_complete,
-                         &completed_request_list);
-
-        /* Process any completions in the list. */
-        list_for_each_safe(current_position, next_position,
-                           &completed_request_list) {
-
-                request = list_entry(current_position, struct isci_request,
-                                     completed_node);
-                task = isci_request_access_task(request);
-
-                /* Return the task to libsas */
-                if (task != NULL) {
-
-                        task->lldd_task = NULL;
-                        if (!test_bit(IREQ_ABORT_PATH_ACTIVE, &request->flags) &&
-                            !(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
-                                if (test_bit(IREQ_COMPLETE_IN_TARGET,
-                                             &request->flags)) {
-
-                                        /* Normal notification (task_done) */
-                                        dev_dbg(&ihost->pdev->dev, "%s: Normal"
-                                                " - request/task = %p/%p\n",
-                                                __func__, request, task);
-
-                                        task->task_done(task);
-                                } else {
-                                        dev_warn(&ihost->pdev->dev,
-                                                 "%s: Error - request/task"
-                                                 " = %p/%p\n",
-                                                 __func__, request, task);
-
-                                        sas_task_abort(task);
-                                }
-                        }
-                }
-                if (test_and_clear_bit(IREQ_ABORT_PATH_ACTIVE, &request->flags))
-                        wake_up_all(&ihost->eventq);
-
-                if (!test_bit(IREQ_NO_AUTO_FREE_TAG, &request->flags))
-                        isci_free_tag(ihost, request->io_tag);
-        }
         spin_unlock_irq(&ihost->scic_lock);
 
         /* the coalesence timeout doubles at each encoding step, so
diff --git a/drivers/scsi/isci/host.h b/drivers/scsi/isci/host.h
index eaa13c0be09a..8e8b46322c64 100644
--- a/drivers/scsi/isci/host.h
+++ b/drivers/scsi/isci/host.h
@@ -204,7 +204,6 @@ struct isci_host {
         unsigned long flags;
         wait_queue_head_t eventq;
         struct tasklet_struct completion_tasklet;
-        struct list_head requests_to_complete;
         spinlock_t scic_lock;
         struct isci_request *reqs[SCI_MAX_IO_REQUESTS];
         struct isci_remote_device devices[SCI_MAX_REMOTE_DEVICES];
@@ -473,6 +472,7 @@ void isci_host_scan_start(struct Scsi_Host *);
 u16 isci_alloc_tag(struct isci_host *ihost);
 enum sci_status isci_free_tag(struct isci_host *ihost, u16 io_tag);
 void isci_tci_free(struct isci_host *ihost, u16 tci);
+void ireq_done(struct isci_host *ihost, struct isci_request *ireq, struct sas_task *task);
 
 int isci_host_init(struct isci_host *);
 void isci_host_completion_routine(unsigned long data);
diff --git a/drivers/scsi/isci/init.c b/drivers/scsi/isci/init.c
index f2a8a3346307..47e28b555029 100644
--- a/drivers/scsi/isci/init.c
+++ b/drivers/scsi/isci/init.c
@@ -555,7 +555,6 @@ static struct isci_host *isci_host_alloc(struct pci_dev *pdev, int id)
                 return NULL;
         }
 
-        INIT_LIST_HEAD(&ihost->requests_to_complete);
         for (i = 0; i < SCI_MAX_PORTS; i++) {
                 struct isci_port *iport = &ihost->ports[i];
 
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
index 6c530e4275e2..7a0431c73493 100644
--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -2748,13 +2748,9 @@ static void isci_request_io_request_complete(struct isci_host *ihost,
         enum exec_status status = SAS_ABORTED_TASK;
 
         dev_dbg(&ihost->pdev->dev,
-                "%s: request = %p, task = %p,\n"
+                "%s: request = %p, task = %p, "
                 "task->data_dir = %d completion_status = 0x%x\n",
-                __func__,
-                request,
-                task,
-                task->data_dir,
-                completion_status);
+                __func__, request, task, task->data_dir, completion_status);
 
         /* The request is done from an SCU HW perspective. */
 
@@ -2955,9 +2951,6 @@ static void isci_request_io_request_complete(struct isci_host *ihost,
         }
         spin_unlock_irqrestore(&task->task_state_lock, task_flags);
 
-        /* Add to the completed list. */
-        list_add(&request->completed_node, &ihost->requests_to_complete);
-
         /* complete the io request to the core. */
         sci_controller_complete_io(ihost, request->target_device, request);
 
@@ -2966,6 +2959,8 @@ static void isci_request_io_request_complete(struct isci_host *ihost,
          * task to recognize the already completed case.
          */
         set_bit(IREQ_TERMINATED, &request->flags);
+
+        ireq_done(ihost, request, task);
 }
 
 static void sci_request_started_state_enter(struct sci_base_state_machine *sm)
@@ -3416,7 +3411,6 @@ static struct isci_request *isci_request_from_tag(struct isci_host *ihost, u16 t
         ireq->io_request_completion = NULL;
         ireq->flags = 0;
         ireq->num_sg_entries = 0;
-        INIT_LIST_HEAD(&ireq->completed_node);
 
         return ireq;
 }
diff --git a/drivers/scsi/isci/request.h b/drivers/scsi/isci/request.h
index 1a651579bb33..aff95317fcf4 100644
--- a/drivers/scsi/isci/request.h
+++ b/drivers/scsi/isci/request.h
@@ -95,8 +95,6 @@ struct isci_request {
                 struct isci_tmf *tmf_task_ptr;  /* When ttype==tmf_task */
         } ttype_ptr;
         struct isci_host *isci_host;
-        /* For use in the requests_to_{complete|abort} lists: */
-        struct list_head completed_node;
         dma_addr_t request_daddr;
         dma_addr_t zero_scatter_daddr;
         unsigned int num_sg_entries;