On Fri, Jun 18, 2021 at 09:35:24AM -0400, Jason J. Herne wrote: > vfio_ap_matrix_dev_release is shadowing the global matrix_dev with driver > data that never gets set. So when release is called we end up not freeing > matrix_dev. The fix is to remove the shadow variable and just free the > global. I would clarify this commit message to say that the drv_data of the matrix_dev is never set and so dev_get_drvdata() always returns NULL And I would suggest to use container_of(dev, struct ap_matrix_dev, dev) instead of the global variable, and probably NULL the global too.. Jason