[PATCH 0/3] drm/{ast, mgag200}: Protect I/O regs against concurrent access

[Thomas Zimmermann <tzimmermann@suse.de>]

Protect access to I/O registers in ast and mgag200 via lock. Commit-
tail functions and get-modes operations use the same registers and can
interfere with each other. This can result in failed mode-setting
operations.

As both drivers use fully managed cleanup, the patchset adds a new helper
that initializes a mutex with auto-cleanup.

Thomas Zimmermann (3):
  drm: Add DRM-managed mutex_init()
  drm/ast: Protect concurrent access to I/O registers with lock
  drm/mgag200: Protect concurrent access to I/O registers with lock

 drivers/gpu/drm/ast/ast_drv.h          |  1 +
 drivers/gpu/drm/ast/ast_main.c         |  4 +++
 drivers/gpu/drm/ast/ast_mode.c         | 48 ++++++++++++++++++++++++--
 drivers/gpu/drm/drm_managed.c          | 27 +++++++++++++++
 drivers/gpu/drm/mgag200/mgag200_drv.c  |  6 ++++
 drivers/gpu/drm/mgag200/mgag200_drv.h  |  1 +
 drivers/gpu/drm/mgag200/mgag200_mode.c | 14 ++++++++
 include/drm/drm_managed.h              |  3 ++
 8 files changed, 101 insertions(+), 3 deletions(-)


base-commit: 3ae2e00290c290713e21118220a817a24b44d39f
prerequisite-patch-id: c2b2f08f0eccc9f5df0c0da49fa1d36267deb11d
prerequisite-patch-id: c67e5d886a47b7d0266d81100837557fda34cb24
-- 
2.36.0