Commit f0846c68 authored by Jeff Skirvin's avatar Jeff Skirvin Committed by Dan Williams
Browse files

isci: Cleaning up task execute path. 



Made sure the device ready check accounts for all states.
Moved the aborted task check into the loop of pulling task requests
off of the submitted list.

Signed-off-by: default avatarJeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: default avatarJacek Danecki <Jacek.Danecki@intel.com>
[remove host and device starting state checks]
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 1fad9e93

drivers/scsi/isci/task.c

+71 −70
Original line number Diff line number Diff line
@@ -83,21 +83,10 @@ int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags) 
	unsigned long flags;

	int ret;

	enum sci_status status;



	enum isci_status device_status;



	dev_dbg(task->dev->port->ha->dev, "%s: num=%d\n", __func__, num);



	if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {



		isci_task_complete_for_upper_layer(

			task,

			SAS_TASK_UNDELIVERED,

			SAM_STAT_TASK_ABORTED,

			isci_perform_normal_io_completion

			);



		return 0;  /* The I/O was accepted (and failed). */

	}

	if ((task->dev == NULL) || (task->dev->port == NULL)) {



		/* Indicate SAS_TASK_UNDELIVERED, so that the scsi midlayer
@@ -143,29 +132,35 @@ int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags) 
			/* We don't have a valid host reference, so we

			 * can't control the host queueing condition.

			 */

			continue;

			goto next_task;

		}



		device = isci_dev_from_domain_dev(task->dev);



		isci_host = isci_host_from_sas_ha(task->dev->port->ha);



		if (device && device->status == isci_ready) {

		if (device)

			device_status = device->status;

		else

			device_status = isci_freed;



		/* From this point onward, any process that needs to guarantee

		 * that there is no kernel I/O being started will have to wait

		 * for the quiesce spinlock.

		 */



		if (device_status != isci_ready_for_io) {



			/* Forces a retry from scsi mid layer. */

			dev_warn(task->dev->port->ha->dev,

				 "%s: task %p: isci_host->status = %d, "

				 "device = %p\n",

				 "device = %p; device_status = 0x%x\n\n",

				 __func__,

				 task,

				 isci_host_get_state(isci_host),

				 device);



			if (device)

				dev_dbg(task->dev->port->ha->dev,

					"%s: device->status = 0x%x\n",

					__func__, device->status);

				 device, device_status);



			if (device_status == isci_ready) {

				/* Indicate QUEUE_FULL so that the scsi midlayer

				* retries.

				*/
@@ -175,45 +170,49 @@ int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags) 
					SAS_QUEUE_FULL,

					isci_perform_normal_io_completion

					);

			isci_host_can_dequeue(isci_host, 1);

			} else {

				/* Else, the device is going down. */

				isci_task_complete_for_upper_layer(

					task,

					SAS_TASK_UNDELIVERED,

					SAS_DEVICE_UNKNOWN,

					isci_perform_normal_io_completion

					);

			}

		/* the device is going down... */

		else if (!device || device->status != isci_ready_for_io) {

			isci_host_can_dequeue(isci_host, 1);

		} else {

			/* There is a device and it's ready for I/O. */

			spin_lock_irqsave(&task->task_state_lock, flags);



			dev_dbg(task->dev->port->ha->dev,

				"%s: task %p: isci_host->status = %d, "

				"device = %p\n",

				__func__,

				task,

				isci_host_get_state(isci_host),

				device);

			if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {



			if (device)

				dev_dbg(task->dev->port->ha->dev,

					"%s: device->status = 0x%x\n",

					__func__, device->status);

				spin_unlock_irqrestore(&task->task_state_lock,

						       flags);



			/* Indicate SAS_TASK_UNDELIVERED, so that the scsi

			 * midlayer removes the target.

			 */

				isci_task_complete_for_upper_layer(

					task,

					SAS_TASK_UNDELIVERED,

				SAS_DEVICE_UNKNOWN,

					SAM_STAT_TASK_ABORTED,

					isci_perform_normal_io_completion

					);

			isci_host_can_dequeue(isci_host, 1);



				/* The I/O was aborted. */



			} else {

				task->task_state_flags |= SAS_TASK_AT_INITIATOR;

				spin_unlock_irqrestore(&task->task_state_lock, flags);



				/* build and send the request. */

				status = isci_request_execute(isci_host, task, &request,

							      gfp_flags);



			if (status == SCI_SUCCESS) {

				if (status != SCI_SUCCESS) {



					spin_lock_irqsave(&task->task_state_lock, flags);

				task->task_state_flags |= SAS_TASK_AT_INITIATOR;

					/* Did not really start this command. */

					task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;

					spin_unlock_irqrestore(&task->task_state_lock, flags);

			} else {



					/* Indicate QUEUE_FULL so that the scsi

					* midlayer retries. if the request

					* failed for remote device reasons,
@@ -230,6 +229,8 @@ int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags) 
					isci_host_can_dequeue(isci_host, 1);

				}

			}

		}

next_task:

		task = list_entry(task->list.next, struct sas_task, list);

	} while (--num > 0);

	return 0;