In the Linux kernel, the following vulnerability has been resolved: drm/v3d: Stop active perfmon if it is being destroyed If the active pe

In the Linux kernel, the following vulnerability has been resolved:

drm/v3d: Stop active perfmon if it is being destroyed

If the active performance monitor (v3d->active_perfmon) is being
destroyed, stop it first. Currently, the active perfmon is not
stopped during destruction, leaving the v3d->active_perfmon pointer
stale. This can lead to undefined behavior and instability.

This patch ensures that the active perfmon is stopped before being
destroyed, aligning with the behavior introduced in commit
7d1fd3638ee3 ("drm/v3d: Stop the active perfmon before being destroyed").