This series converts 9 remaining panel drivers from the deprecated devm_kzalloc() + drm_panel_init() pattern to the refcounted devm_drm_panel_alloc() API. This follows the work by Anusha Srivatsa who introduced the refcounted panel allocation infrastructure [1] and converted a first batch of drivers [2] (the last part of a 5 sub-series).
Reasoning: ---------- The old allocation pattern is unsafe: when the panel device is unbound, devm frees the context struct immediately, but the DRM device may still hold a reference to the embedded drm_panel through the panel bridge, leading to a use-after-free. devm_drm_panel_alloc() wraps the allocation in a kref scheme, so the memory is only freed when the last reference is dropped. After this series, there are no remaining callers of drm_panel_init() under drivers/gpu/drm/panel/, and drm_panel_init() is entirely removed from the public API. [1] https://lore.kernel.org/all/[email protected]/ [2] https://lore.kernel.org/all/20250710-b4-driver-convert-last-part-july-v1-0-de73ba81b...@redhat.com/ Signed-off-by: Albert Esteve <[email protected]> --- Changes in v2: - Remove drm_panel_init/alloc precedence mentions in kdocs - Link to v1: https://lore.kernel.org/r/[email protected] --- Albert Esteve (10): drm/panel/visionox-g2647fb105: Use refcounted allocation in place of devm_kzalloc() drm/panel/samsung-s6e63m0: Use refcounted allocation in place of devm_kzalloc() drm/panel/novatek-nt37700f: Use refcounted allocation in place of devm_kzalloc() drm/panel/lxd-m9189a: Use refcounted allocation in place of devm_kzalloc() drm/panel/ilitek-ili9806e: Use refcounted allocation in place of devm_kzalloc() drm/panel/tdo-tl070wsh30: Use refcounted allocation in place of devm_kzalloc() drm/panel/sharp-ls043t1le01: Use refcounted allocation in place of devm_kzalloc() drm/panel/truly-nt35597: Use refcounted allocation in place of devm_kzalloc() drm/panel/startek-kd070fhfid015: Use refcounted allocation in place of devm_kzalloc() drm/panel: Make drm_panel_init() static drivers/gpu/drm/display/drm_dp_helper.c | 2 -- drivers/gpu/drm/drm_panel.c | 7 +++---- drivers/gpu/drm/panel/panel-ilitek-ili9806e-core.c | 10 +++++----- drivers/gpu/drm/panel/panel-lxd-m9189a.c | 11 ++++++----- drivers/gpu/drm/panel/panel-novatek-nt37700f.c | 11 ++++++----- drivers/gpu/drm/panel/panel-samsung-s6e63m0.c | 14 +++++++------- drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c | 11 ++++++----- drivers/gpu/drm/panel/panel-startek-kd070fhfid015.c | 12 ++++++------ drivers/gpu/drm/panel/panel-tdo-tl070wsh30.c | 14 +++++++------- drivers/gpu/drm/panel/panel-truly-nt35597.c | 10 +++++----- drivers/gpu/drm/panel/panel-visionox-g2647fb105.c | 13 ++++++------- include/drm/drm_panel.h | 4 ---- 12 files changed, 57 insertions(+), 62 deletions(-) --- base-commit: 74fe02ce122a6103f207d29fafc8b3a53de6abaf change-id: 20260506-drm_panel_init_rm-3a4489701f10 Best regards, -- Albert Esteve <[email protected]>
