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b71a623598
Callers of of_drm_find_panel() and drm_of_find_panel_or_bridge() receive a pointer with no reference held, creating a window where the panel device can be unregistered and freed between the lookup and first use (e.g., drm_panel_prepare()). Fix the lookup function by acquiring a reference with drm_panel_get() before returning, under panel_lock. Callers are now responsible for calling drm_panel_put() when they no longer need the pointer. For bridge drivers that immediately wrap the panel in a panel_bridge (which acquires its own reference), release the lookup reference right after the bridge creation call. For analogix-anx6345, which stores the panel for direct use, release the reference in the i2c remove path. For platform drivers using analogix_dp_core with a component lifecycle (exynos_dp, rockchip analogix_dp), release the lookup reference in the platform remove() function. The panel_bridge created during bind() holds a separate reference that devm cleanup releases after remove() returns. Also fix devm_drm_of_get_bridge() and drmm_of_get_bridge() in bridge/panel.c itself, update a second batch of drivers calling of_drm_find_panel() or drm_of_find_panel_or_bridge() to release the lookup reference after wrapping the panel in a bridge, and handle the cases where a panel is found but cannot be used, dropping the reference immediately in those paths. Assisted-by: Claude:claude-opus-4-6 Acked-by: Maxime Ripard <mripard@kernel.org> Signed-off-by: Albert Esteve <aesteve@redhat.com> Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> Link: https://patch.msgid.link/20260717-drm_refcount_wiring-v3-3-023900c32e01@redhat.com |
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| .. | ||
| Kconfig | ||
| Makefile | ||
| NOTES | ||
| sti_awg_utils.c | ||
| sti_awg_utils.h | ||
| sti_compositor.c | ||
| sti_compositor.h | ||
| sti_crtc.c | ||
| sti_crtc.h | ||
| sti_cursor.c | ||
| sti_cursor.h | ||
| sti_drv.c | ||
| sti_drv.h | ||
| sti_dvo.c | ||
| sti_gdp.c | ||
| sti_gdp.h | ||
| sti_hda.c | ||
| sti_hdmi_tx3g4c28phy.c | ||
| sti_hdmi_tx3g4c28phy.h | ||
| sti_hdmi.c | ||
| sti_hdmi.h | ||
| sti_hqvdp_lut.h | ||
| sti_hqvdp.c | ||
| sti_mixer.c | ||
| sti_mixer.h | ||
| sti_plane.c | ||
| sti_plane.h | ||
| sti_tvout.c | ||
| sti_vid.c | ||
| sti_vid.h | ||
| sti_vtg.c | ||
| sti_vtg.h | ||