Description
In the Linux kernel, the following vulnerability has been resolved: drm/imagination: Fix kernel crash when hard resetting the GPU The GPU hard reset sequence calls pm_runtime_force_suspend() and pm_runtime_force_resume(), which according to their documentation should only be used during system-wide PM transitions to sleep states. The main issue though is that depending on some internal runtime PM state as seen by pm_runtime_force_suspend() (whether the usage count is <= 1), pm_runtime_force_resume() might not resume the device unless needed. If that happens, the runtime PM resume callback pvr_power_device_resume() is not called, the GPU clocks are not re-enabled, and the kernel crashes on the next attempt to access GPU registers as part of the power-on sequence. Replace calls to pm_runtime_force_suspend() and pm_runtime_force_resume() with direct calls to the driver's runtime PM callbacks, pvr_power_device_suspend() and pvr_power_device_resume(), to ensure clocks are re-enabled and avoid the kernel crash.
Product status
cc1aeedb98ad347c06ff59e991b2f94dfb4c565d (git) before 9f852d301f642223c4798f3c13ba15e91165d078
cc1aeedb98ad347c06ff59e991b2f94dfb4c565d (git) before e066cc6e0f094ca2120f1928d126d56f686cd73e
cc1aeedb98ad347c06ff59e991b2f94dfb4c565d (git) before d38376b3ee48d073c64e75e150510d7e6b4b04f7
6.8
Any version before 6.8
6.12.39 (semver)
6.15.7 (semver)
6.16 (original_commit_for_fix)
References
git.kernel.org/...c/9f852d301f642223c4798f3c13ba15e91165d078
git.kernel.org/...c/e066cc6e0f094ca2120f1928d126d56f686cd73e
git.kernel.org/...c/d38376b3ee48d073c64e75e150510d7e6b4b04f7