isci: Errors in the submit path for SATA devices manage the ap lock.

Since libsas takes the domain device sata_dev.ap->lock before submitting
a task, error completions in the submit path for SATA devices must
unlock/relock when completing the sas_task back to libsas.

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

1 files changed, 87 insertions, 0 deletions

diff --git a/drivers/scsi/isci/task.c b/drivers/scsi/isci/task.c
index a1234e42937e..d00b4c97b85b 100644
--- a/drivers/scsi/isci/task.c
+++ b/drivers/scsi/isci/task.c
@@ -54,6 +54,8 @@
  */
 
 #include <linux/completion.h>
+#include <linux/irqflags.h>
+#include <scsi/sas_ata.h>
 #include "scic_task_request.h"
 #include "scic_remote_device.h"
 #include "scic_io_request.h"
@@ -64,6 +66,91 @@
 #include "sata.h"
 #include "task.h"
 
+/**
+* isci_task_complete_for_upper_layer() - This function completes the request
+*    to the upper layer driver in the case where an I/O needs to be completed
+*    back in the submit path.
+* @host: This parameter is a pointer to the host on which the the request
+*    should be queued (either as an error or success).
+* @task: This parameter is the completed request.
+* @response: This parameter is the response code for the completed task.
+* @status: This parameter is the status code for the completed task.
+*
+* none.
+*/
+static void isci_task_complete_for_upper_layer(struct sas_task *task,
+                                               enum service_response response,
+                                               enum exec_status status,
+                                               enum isci_completion_selection task_notification_selection)
+{
+        unsigned long    flags = 0;
+        struct Scsi_Host *host = NULL;
+
+        task_notification_selection
+                = isci_task_set_completion_status(task, response, status,
+                                                  task_notification_selection);
+
+        /* Tasks aborted specifically by a call to the lldd_abort_task
+        * function should not be completed to the host in the regular path.
+        */
+        switch (task_notification_selection) {
+                case isci_perform_normal_io_completion:
+                        /* Normal notification (task_done) */
+                        dev_dbg(task->dev->port->ha->dev,
+                                "%s: Normal - task = %p, response=%d, status=%d\n",
+                                __func__, task, response, status);
+
+                        if (dev_is_sata(task->dev)) {
+                                /* Since we are still in the submit path, and since
+                                * libsas takes the host lock on behalf of SATA
+                                * devices before I/O starts, we need to unlock
+                                * before we can call back and report the I/O
+                                * submission error.
+                                */
+                                if (task->dev
+                                    && task->dev->port
+                                    && task->dev->port->ha) {
+
+                                        host = task->dev->port->ha->core.shost;
+                                        raw_local_irq_save(flags);
+                                        spin_unlock(host->host_lock);
+                                }
+                                task->task_done(task);
+                                if (host) {
+                                        spin_lock(host->host_lock);
+                                        raw_local_irq_restore(flags);
+                                }
+                        } else
+                                task->task_done(task);
+
+                        task->lldd_task = NULL;
+                        break;
+
+                case isci_perform_aborted_io_completion:
+                        /* No notification because this request is already in the
+                        * abort path.
+                        */
+                        dev_warn(task->dev->port->ha->dev,
+                                 "%s: Aborted - task = %p, response=%d, status=%d\n",
+                                 __func__, task, response, status);
+                        break;
+
+                case isci_perform_error_io_completion:
+                        /* Use sas_task_abort */
+                        dev_warn(task->dev->port->ha->dev,
+                                 "%s: Error - task = %p, response=%d, status=%d\n",
+                                 __func__, task, response, status);
+                        sas_task_abort(task);
+                        break;
+
+                default:
+                        dev_warn(task->dev->port->ha->dev,
+                                 "%s: isci task notification default case!",
+                                 __func__);
+                        sas_task_abort(task);
+                        break;
+        }
+}
 
 /**
  * isci_task_execute_task() - This function is one of the SAS Domain Template