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scsi: isci: Drop SAS_TASK_AT_INITIATOR check in isci_task_abort_task()

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In the queue path, move around when we assign sas_task->lldd_task such that
this pointer and the SAS_TASK_AT_INITIATOR flag are set atomically.  It is
also not required to clear SAS_TASK_AT_INITIATOR in isci_task_execute_task()
error path as it is also cleared immediately after in isci_task_refuse()
call.

Now the following items may be considered:

 - SAS_TASK_STATE_DONE and SAS_TASK_AT_INITIATOR are mutually exclusive
   apart from possibly when SAS_TASK_STATE_DONE is set in
   sas_scsi_find_task(), but that is after .lldd_abort_task, i.e. the
   considered callback, is called.

 - If isci_task_refuse() is called in the queue path, then
   sas_task->lldd_task and SAS_TASK_AT_INITIATOR are cleared atomically in
   isci_task_refuse().

 - In the completion path, SAS_TASK_STATE_DONE is set and
   SAS_TASK_AT_INITIATOR is cleared atomically before the
   sas_task.lldd_task is cleared later.

So in isci_task_abort_task() if SAS_TASK_STATE_DONE is not set and
sas_task.lldd_task is still set, then SAS_TASK_AT_INITIATOR must be set -
so we can drop this check on SAS_TASK_AT_INITIATOR.

[mkp: checkpatch]

Link: https://lore.kernel.org/r/1644489804-85730-2-git-send-email-john.garry@huawei.com
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
John Garry 2022-02-10 18:43:23 +08:00 committed by Martin K. Petersen
parent fa1d43f396
commit c39d5aa457
3 changed files with 14 additions and 16 deletions
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12
drivers/scsi/isci/request.c
View File

@ -3406,9 +3406,9 @@ static struct isci_request *isci_request_from_tag(struct isci_host *ihost, u16 t
return ireq;
}
static struct isci_request *isci_io_request_from_tag(struct isci_host *ihost,
struct sas_task *task,
u16 tag)
struct isci_request *isci_io_request_from_tag(struct isci_host *ihost,
struct sas_task *task,
u16 tag)
{
struct isci_request *ireq;
@ -3434,16 +3434,12 @@ struct isci_request *isci_tmf_request_from_tag(struct isci_host *ihost,
}
int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev,
struct sas_task *task, u16 tag)
struct sas_task *task, struct isci_request *ireq)
{
enum sci_status status;
struct isci_request *ireq;
unsigned long flags;
int ret = 0;
/* do common allocation and init of request object. */
ireq = isci_io_request_from_tag(ihost, task, tag);
status = isci_io_request_build(ihost, ireq, idev);
if (status != SCI_SUCCESS) {
dev_dbg(&ihost->pdev->dev,

5
drivers/scsi/isci/request.h
View File

@ -291,7 +291,10 @@ struct isci_request *isci_tmf_request_from_tag(struct isci_host *ihost,
struct isci_tmf *isci_tmf,
u16 tag);
int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev,
struct sas_task *task, u16 tag);
struct sas_task *task, struct isci_request *ireq);
struct isci_request *isci_io_request_from_tag(struct isci_host *ihost,
struct sas_task *task,
u16 tag);
enum sci_status
sci_task_request_construct(struct isci_host *ihost,
struct isci_remote_device *idev,

13
drivers/scsi/isci/task.c
View File

@ -162,18 +162,18 @@ int isci_task_execute_task(struct sas_task *task, gfp_t gfp_flags)
SAS_TASK_UNDELIVERED,
SAS_SAM_STAT_TASK_ABORTED);
} else {
struct isci_request *ireq;
task->task_state_flags |= SAS_TASK_AT_INITIATOR;
/* do common allocation and init of request object. */
ireq = isci_io_request_from_tag(ihost, task, tag);
spin_unlock_irqrestore(&task->task_state_lock, flags);
/* build and send the request. */
status = isci_request_execute(ihost, idev, task, tag);
/* do common allocation and init of request object. */
status = isci_request_execute(ihost, idev, task, ireq);
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);
if (test_bit(IDEV_GONE, &idev->flags)) {
/* Indicate that the device
* is gone.
@ -498,7 +498,6 @@ int isci_task_abort_task(struct sas_task *task)
/* If task is already done, the request isn't valid */
if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
(task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
old_request) {
idev = isci_get_device(task->dev->lldd_dev);
target_done_already = test_bit(IREQ_COMPLETE_IN_TARGET,