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We may reset the controller in many scenarios, such as SCSI EH and HW errors. There should be no IO which returns from target when SCSI EH is active. But for other scenarios, there may be. It is not necessary to make such IOs fail. This patch adds an function of trying to wait for any commands, or IO, to complete before host reset. If no more CQ returned from host controller in 100ms, we assume no more IO can return, and then stop waiting. We wait 5s at most. The HW has a register CQE_SEND_CNT to indicate the total number of CQs that has been reported to driver. We can use this register and it is reliable to resd this register in such scenarios that require host reset. Signed-off-by: Xiaofei Tan <tanxiaofei@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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.