From: Sean Paul <seanpaul@xxxxxxxxxxxx> Suggested-by: Daniel Vetter <daniel@xxxxxxxx> Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx> --- Documentation/gpu/todo.rst | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst index 38360ede12215..7fc30380eaf6c 100644 --- a/Documentation/gpu/todo.rst +++ b/Documentation/gpu/todo.rst @@ -262,6 +262,21 @@ As a reference, take a look at the conversions already completed in drm core. Contact: Sean Paul, respective driver maintainers +Convert direct mode.vrefresh accesses to use drm_mode_vrefresh() +---------------------------------------------------------------- + +drm_display_mode.vrefresh isn't guaranteed to be populated. As such, using it +is risky and has been known to cause div-by-zero bugs. Fortunately, drm core +has helper which will use mode.vrefresh if it's !0 and will calculate it from +the timings when it's 0. + +Use simple search/replace, or (more fun) cocci to replace instances of direct +vrefresh access with a call to the helper. Check out +https://lists.freedesktop.org/archives/dri-devel/2019-January/205186.html for +inspiration. + +Contact: Sean Paul + Core refactorings ================= -- Sean Paul, Software Engineer, Google / Chromium OS _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
