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Processing events such as PORTE_BROADCAST_RCVD may cause dependency issues for runtime power management support. Such a problem would be that handling a PORTE_BROADCAST_RCVD event requires that the host is resumed to send SMP commands. However, in resuming the host, the phyup events generated from re-enabling the phys are processed in the same workqueue as the original PORTE_BROADCAST_RCVD event. As such, the host will never finish resuming (as it waits for the phyup event processing), and then the PORTE_BROADCAST_RCVD event can't be processed as the SMP commands are blocked, and so we have a deadlock. Solve this problem by ensuring that libsas keeps the host active until completely finished phy or port events, such as PORTE_BYTES_DMAED. As such, we don't have to worry about resuming the host for processing individual SMP commands in this example. Link: https://lore.kernel.org/r/1639999298-244569-15-git-send-email-chenxiang66@hisilicon.com Reviewed-by: John Garry <john.garry@huawei.com> Signed-off-by: Xiang Chen <chenxiang66@hisilicon.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.