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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>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.