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DRM bridges are currently considered as a fixed element of a DRM card, and thus their lifetime is assumed to extend for as long as the card exists. New use cases, such as hot-pluggable hardware with video bridges, require DRM bridges to be added to and removed from a DRM card without tearing the card down. This is possible for connectors already (used by DP MST), it is now needed for DRM bridges as well. As a first preliminary step, make bridges reference-counted to allow a struct drm_bridge (along with the private driver structure embedding it) to stay allocated even after the driver has been removed, until the last reference is put. Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com> Reviewed-by: Maxime Ripard <mripard@kernel.org> Link: https://patchwork.freedesktop.org/patch/msgid/20250326-drm-bridge-refcount-v9-2-5e0661fe1f84@bootlin.com Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>