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41ae9105f5
An endpoint can be unregistered via two paths. Either its parent port is
unregistered, or the memdev that registered the endpoint is removed. The
memdev remove path is responsible for synchronizing against the parent
->remove() event and if the memdev remove path wins, manually trigger
unregister_port() via devm_release_action(). Until that race is resolved
the memdev remove path holds a reference on the endpoint.
If the parent port for the endpoint can not be found that is an
indication that the endpoint has already been registered. Be sure to
drop the reference in all exit paths from delete_endpoint().
Fixes: 8dd2bc0f8e ("cxl/mem: Add the cxl_mem driver")
Link: https://lore.kernel.org/r/164454148209.3429624.12905500880311609053.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.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.