[drm-misc-next,v2,0/4] Fixes for vc4 hotplug rework

Message

Danilo Krummrich Aug. 19, 2022, 11:08 a.m. UTC

Hi,

I've found a few potential issues left after the hotplug rework.

In vc4_hdmi.c we're missing two mutex_unlock() calls when the device is
unplugged.

vc4_crtc and vc4_plane seem to miss some drm_dev_enter()/drm_dev_exit() calls
to protect against resource access after the device/driver is unbound, but the
DRM potentially isn't freed yet and userspace can still call into the driver.

Changes in v2:
  - Use drm_device pointer from struct drm_plane (Maxime)
  - Protect entire functions to increase readability (Maxime)
  - Add another patch to fix an uncovered MMIO access in vc4_hvs.c

Danilo Krummrich (4):
  drm/vc4: hdmi: unlock mutex when device is unplugged
  drm/vc4: plane: protect device resources after removal
  drm/vc4: crtc: protect device resources after removal
  drm/vc4: hvs: protect drm_print_regset32()

 drivers/gpu/drm/vc4/vc4_crtc.c  | 41 ++++++++++++++++++++++++++++++++-
 drivers/gpu/drm/vc4/vc4_hdmi.c  |  7 ++++--
 drivers/gpu/drm/vc4/vc4_hvs.c   |  4 ++--
 drivers/gpu/drm/vc4/vc4_plane.c | 20 ++++++++++++++++
 4 files changed, 67 insertions(+), 5 deletions(-)


base-commit: 8ba9249396bef37cb68be9e8dee7847f1737db9d