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start_cpsch and stop_cpsch can be called during kfd device initialization or during gpu reset/recovery. So they can run concurrently. Currently in start_cpsch and stop_cpsch, pm_init and pm_uninit is not protected by the dpm lock. Imagine such a case that user use packet manager's function to submit a pm4 packet to hang hws (ie through command cat /sys/class/kfd/kfd/topology/nodes/1/gpu_id | sudo tee /sys/kernel/debug/kfd/hang_hws), while kfd device is under device reset/recovery so packet manager can be not initialized. There will be unpredictable protection fault in such case. This patch moves pm_init/uninit inside the dpm lock and check packet manager is initialized before using packet manager function. Signed-off-by: Oak Zeng <Oak.Zeng@amd.com> Acked-by: Christian Konig <christian.koenig@amd.com> Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.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.