drm/vc4: plane: protect device resources after removal
authorDanilo Krummrich <dakr@redhat.com>
Wed, 24 Aug 2022 16:13:25 +0000 (18:13 +0200)
committerMaxime Ripard <maxime@cerno.tech>
Thu, 25 Aug 2022 07:44:25 +0000 (09:44 +0200)
commit6acb416bf49f818dbf0aa71aee9f6cae93a505a4
tree9e6c2a884104c512471e3f376f20f40d708939c1
parent227295df4e37de66b61bbb3d1f10436f0acd33cc
drm/vc4: plane: protect device resources after removal

(Hardware) resources which are bound to the driver and device lifecycle
must not be accessed after the device and driver are unbound.

However, the DRM device isn't freed as long as the last user closed it,
hence userspace can still call into the driver.

Therefore protect the critical sections which are accessing those
resources with drm_dev_enter() and drm_dev_exit().

Fixes: 9872c7a31921 ("drm/vc4: plane: Switch to drmm_universal_plane_alloc()")
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220824161327.330627-3-dakr@redhat.com
drivers/gpu/drm/vc4/vc4_plane.c