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When user closes the compute device file descriptor without closing a dma-buf file descriptor, the device will be considered as in use, leading to hard reset and killing the user process, to ensure the release of the dma-buf. Same thing will happen if user first releases the compute device file and only then the dma-buf. The implication of this is the duration of hard reset, during which the device cannot be reacquired. Moreover, this behavior adds a constraint on a user process to follow this order of release operations. To avoid killing the user process and to remove this constraint, enforce the correct order of release operations inside the driver, by incrementing the device file refcount for any dma-buf until it is released. Signed-off-by: Tomer Tayar <ttayar@habana.ai> Reviewed-by: Oded Gabbay <ogabbay@kernel.org> Signed-off-by: Oded Gabbay <ogabbay@kernel.org> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.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.