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hl_get_compute_ctx() is used to get the pointer to the compute context from the hpriv object. The function is called in code paths that are not necessarily initiated by user, so it is possible that a context release process will happen in parallel. This can lead to a race condition in which hl_get_compute_ctx() retrieves the context pointer, and just before it increments the context refcount, the context object is released and a freed memory is accessed. To avoid this race, add a mutex to protect the context pointer in hpriv. With this lock, hl_get_compute_ctx() will be able to detect if the context has been released or is about to be released. struct hl_ctx_mgr has a mutex for contexts IDR with a similar "ctx_lock" name, so rename it to just "lock" to avoid a confusion with the new lock. Signed-off-by: Tomer Tayar <ttayar@habana.ai> Reviewed-by: Oded Gabbay <ogabbay@kernel.org> Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
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.