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isci: Cleaning up task execute path.

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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: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Jacek Danecki <Jacek.Danecki@intel.com>
[remove host and device starting state checks]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Jeff Skirvin 2011-03-08 19:22:07 -07:00 committed by Dan Williams
parent 1fad9e934a
commit f0846c6891
1 changed files with 74 additions and 73 deletions
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147
drivers/scsi/isci/task.c
View file

@ -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
@ -143,93 +132,105 @@ 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);
device, device_status);
if (device)
dev_dbg(task->dev->port->ha->dev,
"%s: device->status = 0x%x\n",
__func__, device->status);
/* Indicate QUEUE_FULL so that the scsi midlayer
* retries.
*/
isci_task_complete_for_upper_layer(
task,
SAS_TASK_COMPLETE,
SAS_QUEUE_FULL,
isci_perform_normal_io_completion
);
if (device_status == isci_ready) {
/* Indicate QUEUE_FULL so that the scsi midlayer
* retries.
*/
isci_task_complete_for_upper_layer(
task,
SAS_TASK_COMPLETE,
SAS_QUEUE_FULL,
isci_perform_normal_io_completion
);
} 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
);
}
isci_host_can_dequeue(isci_host, 1);
}
/* the device is going down... */
else if (!device || device->status != isci_ready_for_io) {
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 (device)
dev_dbg(task->dev->port->ha->dev,
"%s: device->status = 0x%x\n",
__func__, device->status);
/* 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,
isci_perform_normal_io_completion
);
isci_host_can_dequeue(isci_host, 1);
} else {
/* build and send the request. */
status = isci_request_execute(isci_host, task, &request,
gfp_flags);
/* There is a device and it's ready for I/O. */
spin_lock_irqsave(&task->task_state_lock, flags);
if (status == SCI_SUCCESS) {
spin_lock_irqsave(&task->task_state_lock, flags);
if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
spin_unlock_irqrestore(&task->task_state_lock,
flags);
isci_task_complete_for_upper_layer(
task,
SAS_TASK_UNDELIVERED,
SAM_STAT_TASK_ABORTED,
isci_perform_normal_io_completion
);
/* The I/O was aborted. */
} else {
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,
* it gets returned as
* SAS_TASK_UNDELIVERED next time
* through.
*/
isci_task_complete_for_upper_layer(
/* build and send the request. */
status = isci_request_execute(isci_host, task, &request,
gfp_flags);
if (status != SCI_SUCCESS) {
spin_lock_irqsave(&task->task_state_lock, flags);
/* Did not really start this command. */
task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
spin_unlock_irqrestore(&task->task_state_lock, flags);
/* Indicate QUEUE_FULL so that the scsi
* midlayer retries. if the request
* failed for remote device reasons,
* it gets returned as
* SAS_TASK_UNDELIVERED next time
* through.
*/
isci_task_complete_for_upper_layer(
task,
SAS_TASK_COMPLETE,
SAS_QUEUE_FULL,
isci_perform_normal_io_completion
);
isci_host_can_dequeue(isci_host, 1);
isci_host_can_dequeue(isci_host, 1);
}
}
}
next_task:
task = list_entry(task->list.next, struct sas_task, list);
} while (--num > 0);
return 0;