Interrnship season is starting, let's review this. One thing that's pending is Maxime's work to roll out drm_atomic_state pointers to all callbacks, he said he'll remove that entry once it's all done.
Signed-off-by: Daniel Vetter daniel.vetter@intel.com Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: Maxime Ripard mripard@kernel.org Cc: Thomas Zimmermann tzimmermann@suse.de Cc: David Airlie airlied@linux.ie Cc: Daniel Vetter daniel@ffwll.ch --- Documentation/gpu/todo.rst | 28 +++++++++++++++------------- 1 file changed, 15 insertions(+), 13 deletions(-)
diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst index 009d8e6c7e3c..492768dd2fd9 100644 --- a/Documentation/gpu/todo.rst +++ b/Documentation/gpu/todo.rst @@ -577,20 +577,24 @@ Contact: Daniel Vetter
Level: Intermediate
-KMS cleanups ------------- +Object lifetime fixes +--------------------- + +There's two related issues here + +- Cleanup up the various ->destroy callbacks, which often are all the same + simple code.
-Some of these date from the very introduction of KMS in 2008 ... +- Lots of drivers erroneously allocate DRM modeset objects using devm_kzalloc, + which results in use-after free issues on driver unload. This can be serious + trouble even for drivers for hardwared integrated on the SoC due to + EPROBE_DEFERRED backoff.
-- Make ->funcs and ->helper_private vtables optional. There's a bunch of empty - function tables in drivers, but before we can remove them we need to make sure - that all the users in helpers and drivers do correctly check for a NULL - vtable. +Both these problems can be solved by switching over to drmm_kzalloc(), and the +various convenience wrappers provided, e.g. drmm_crtc_alloc_with_planes(), +drmm_universal_plane_alloc(), ... and so on.
-- Cleanup up the various ->destroy callbacks. A lot of them just wrapt the - drm_*_cleanup implementations and can be removed. Some tack a kfree() at the - end, for which we could add drm_*_cleanup_kfree(). And then there's the (for - historical reasons) misnamed drm_primary_helper_destroy() function. +Contact: Daniel Vetter
Level: Intermediate
@@ -626,8 +630,6 @@ See the documentation of :ref:`VKMS <vkms>` for more details. This is an ideal internship task, since it only requires a virtual machine and can be sized to fit the available time.
-Contact: Daniel Vetter - Level: See details
Backlight Refactoring