This series is an attempt to fix the unbind/bind crash (due to an use-after-free bug) found on rockchip-drm driver.
The problem lies in the way the driver uses the component API. Currently, rockchip_drm_unbind calls component_unbind_all before drm_mode_config_cleanup, the former releasing the memory where the DRM objects are embedded.
The series goal is basically to fix all the components, making proper use of the respective .destroy hooks, making sure there are no use-after-free or double-free issues.
The first patch is likely the most controversial, which is required because component_bind_all will call component_unbind without calling drm_mode_config_cleanup, if any component fails to bind. As mentioned above, this is problematic in the DRM framework.
Thanks! Ezequiel
Ezequiel Garcia (5): component: Add an API to cleanup before unbind drm/rockchip: Fix the device unbind order drm/rockchip: vop: Fix CRTC unbind drm/rockchip: lvds: Fix component unbind drm/rockchip: rk3066_hdmi: Cleanup component unbind
drivers/base/component.c | 9 +++- drivers/gpu/drm/rockchip/rk3066_hdmi.c | 8 +-- drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 20 +++++--- drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 56 ++++++++------------- drivers/gpu/drm/rockchip/rockchip_lvds.c | 20 ++++---- include/linux/component.h | 10 +++- 6 files changed, 60 insertions(+), 63 deletions(-)