The connector->eld is accessed by the .get_eld() callback. This access can collide with the drm_edid_to_eld() updating the data at the same time. Add drm_connector.eld_mutex to protect the data from concurrenct access. The individual drivers were just compile tested. I propose to merge the drm_connector and bridge drivers through drm-misc, allowing other maintainers either to ack merging through drm-misc or merging the drm-misc into their tree and then picking up correcponding patch. Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> --- Changes in v2: - Also take the mutex in clear_eld() (Jani) - Rebased on top of linux-next + drm-misc-next to solve build error - Link to v1: https://lore.kernel.org/r/20241201-drm-connector-eld-mutex-v1-0-ba56a6545c03@xxxxxxxxxx --- Dmitry Baryshkov (10): drm/connector: add mutex to protect ELD from concurrent access drm/bridge: anx7625: use eld_mutex to protect access to connector->eld drm/bridge: ite-it66121: use eld_mutex to protect access to connector->eld drm/amd/display: use eld_mutex to protect access to connector->eld drm/exynos: hdmi: use eld_mutex to protect access to connector->eld drm/i915/audio: use eld_mutex to protect access to connector->eld drm/msm/dp: use eld_mutex to protect access to connector->eld drm/radeon: use eld_mutex to protect access to connector->eld drm/sti: hdmi: use eld_mutex to protect access to connector->eld drm/vc4: hdmi: use eld_mutex to protect access to connector->eld drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 ++ drivers/gpu/drm/bridge/analogix/anx7625.c | 2 ++ drivers/gpu/drm/bridge/ite-it66121.c | 2 ++ drivers/gpu/drm/drm_connector.c | 1 + drivers/gpu/drm/drm_edid.c | 6 ++++++ drivers/gpu/drm/exynos/exynos_hdmi.c | 2 ++ drivers/gpu/drm/i915/display/intel_audio.c | 3 +++ drivers/gpu/drm/msm/dp/dp_audio.c | 2 ++ drivers/gpu/drm/radeon/radeon_audio.c | 2 ++ drivers/gpu/drm/sti/sti_hdmi.c | 2 ++ drivers/gpu/drm/vc4/vc4_hdmi.c | 4 ++-- include/drm/drm_connector.h | 5 ++++- 12 files changed, 30 insertions(+), 3 deletions(-) --- base-commit: 84e541b1e58e04d808e1bb13ef566ffbe87aa89b change-id: 20241201-drm-connector-eld-mutex-8a39a35e9a38 Best regards, -- Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
