isci: Manage tag releases differently when aborting tasks.

When an individual request is being terminated, the request's tag
is managed in the terminate function.
Signed-off-by: NJeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: NDan Williams <dan.j.williams@intel.com>

drivers/scsi/isci/host.c

@@ -1141,7 +1141,8 @@ void isci_host_completion_routine(unsigned long data)
 		if (test_and_clear_bit(IREQ_ABORT_PATH_ACTIVE, &request->flags))
 			wake_up_all(&ihost->eventq);
 
-		isci_free_tag(ihost, request->io_tag);
+		if (!test_bit(IREQ_NO_AUTO_FREE_TAG, &request->flags))
+			isci_free_tag(ihost, request->io_tag);
 	}
 	spin_unlock_irq(&ihost->scic_lock);
 

drivers/scsi/isci/remote_device.c

@@ -104,15 +104,15 @@ static enum sci_status sci_remote_device_terminate_req(
 	int check_abort,
 	struct isci_request *ireq)
 {
-	dev_dbg(&ihost->pdev->dev,
-		"%s: idev=%p; flags=%lx; req=%p; req target=%p\n",
-		__func__, idev, idev->flags, ireq, ireq->target_device);
-
 	if (!test_bit(IREQ_ACTIVE, &ireq->flags) ||
 	    (ireq->target_device != idev) ||
 	    (check_abort && !test_bit(IREQ_PENDING_ABORT, &ireq->flags)))
 		return SCI_SUCCESS;
 
+	dev_dbg(&ihost->pdev->dev,
+		"%s: idev=%p; flags=%lx; req=%p; req target=%p\n",
+		__func__, idev, idev->flags, ireq, ireq->target_device);
+
 	set_bit(IREQ_ABORT_PATH_ACTIVE, &ireq->flags);
 
 	return sci_controller_terminate_request(ihost, idev, ireq);
@@ -209,11 +209,14 @@ enum sci_status isci_remote_device_terminate_requests(
 			rnc_suspend_count, idev->rnc.suspend_count);
 		if (ireq) {
 			/* Terminate a specific TC. */
+			set_bit(IREQ_NO_AUTO_FREE_TAG, &ireq->flags);
 			sci_remote_device_terminate_req(ihost, idev, 0, ireq);
 			spin_unlock_irqrestore(&ihost->scic_lock, flags);
 			wait_event(ihost->eventq,
 				   isci_check_reqterm(ihost, idev, ireq,
 						      rnc_suspend_count));
+			clear_bit(IREQ_NO_AUTO_FREE_TAG, &ireq->flags);
+			isci_free_tag(ihost, ireq->io_tag);
 		} else {
 			/* Terminate all TCs. */
 			sci_remote_device_terminate_requests(idev);

drivers/scsi/isci/request.h

@@ -87,6 +87,7 @@ struct isci_request {
 	#define IREQ_PENDING_ABORT 4 /* Set == device was not suspended yet */
 	#define IREQ_TC_ABORT_POSTED 5
 	#define IREQ_ABORT_PATH_ACTIVE 6
+	#define IREQ_NO_AUTO_FREE_TAG 7 /* Set when being explicitly managed */
 	unsigned long flags;
 	/* XXX kill ttype and ttype_ptr, allocate full sas_task */
 	union ttype_ptr_union {

drivers/scsi/isci/task.c

@@ -719,7 +719,8 @@ isci_task_request_complete(struct isci_host *ihost,
 	 */
 	set_bit(IREQ_TERMINATED, &ireq->flags);
 
-	isci_free_tag(ihost, ireq->io_tag);
+	if (!test_bit(IREQ_NO_AUTO_FREE_TAG, &ireq->flags))
+		isci_free_tag(ihost, ireq->io_tag);
 
 	/* The task management part completes last. */
 	if (tmf_complete)