drm/bridge/panel: hold a reference to the wrapped panel

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drm_panel_bridge_add_typed() stores a pointer to the drm_panel it
wraps, but never acquires a reference to it. If the panel device
goes away while a panel_bridge still exists, the dangling pointer can
be dereferenced through panel_bridge->panel.

Acquire a reference in drm_panel_bridge_add_typed() with drm_panel_get()
and release it in each teardown path.

Reviewed-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-v3-2-023900c32e01@redhat.com

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Albert Esteve 2026-07-17 16:02:05 +02:00 • committed by Neil Armstrong

parent 61aebeadff

commit 8f79d34ea8

1 changed files with 10 additions and 2 deletions

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drivers/gpu/drm/bridge/panel.c

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