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cmd->cmd_lock only protects cmd->aborted, but when deciding how to process a cmd, it is necessary to consider other factors such as cmd->state and if the chip has been reset, which are protected by qpair->qp_lock_ptr. So replace cmd_lock with qp_lock_ptr, whick makes it possible to check additional values and make decisions about what to do without racing with the CTIO handler and other code. - Lock cmd->qpair->qp_lock_ptr when aborting a cmd. - Eliminate cmd->cmd_lock and change cmd->aborted to a bitfield since it is now protected by qp_lock_ptr just like all the other flags. - Add another command state QLA_TGT_STATE_DONE to avoid any possible races between qlt_abort_cmd() and tgt_ops->free_cmd(). - Add the cmd->sent_term_exchg flag to indicate if qlt_send_term_exchange() has already been called. - Export qlt_send_term_exchange() for SCST so that it can be called directly instead of trying to make qlt_abort_cmd() work for both TMR abort and HW timeout. Signed-off-by: Tony Battersby <tonyb@cybernetics.com> Link: https://patch.msgid.link/2c8d03e4-308b-4d5a-a418-a334be23f815@cybernetics.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 reStructuredText 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.