Jon Hunter 8a4b72a4aa gpu: nvgpu: Fix crash when reading CE_APP debugfs ...

The CE_APP debugfs nodes are created when the NVGPU driver is probed,
however, the 'ce_app' structure which contains the variables exposed
via the debugfs, is not allocated until nvgpu_finalize_poweron() is
called. Therefore, if the user attempts to access the CE_APP debugfs
nodes before the NVGPU has been powered on, for example, right after
Linux has booted, then this results in a NULL pointer dereference crash.
Fix this by moving the creation of the CE_APP debugfs nodes to
nvgpu_finalize_poweron_linux() which is called after
nvgpu_finalize_poweron().

Bug 200747304

Change-Id: Icd28952112f86887a1d6b6f8beb382f5189461a9
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2572106
(cherry picked from commit 35a0c18d93e97265611c3bbfae41b39d9cd183e3)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2587367
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: svc_kernel_abi <svc_kernel_abi@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit

2021-09-02 07:23:53 -07:00

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