From: Douglas Anderson dianders@chromium.org
[ Upstream commit bab5cca7e609952b069a550e39fe4893149fb658 ]
The drm_bridge_chain_pre_enable() is not the proper opposite of drm_bridge_chain_post_disable(). It continues along the chain to _before_ the starting bridge. Let's fix that.
Fixes: 05193dc38197 ("drm/bridge: Make the bridge chain a double-linked list") Signed-off-by: Douglas Anderson dianders@chromium.org Reviewed-by: Andrzej Hajda a.hajda@samsung.com Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Link: https://patchwork.freedesktop.org/patch/msgid/20210416153909.v4.1.If62a003f7... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/drm_bridge.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index 64f0effb52ac..044acd07c153 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -522,6 +522,9 @@ void drm_bridge_chain_pre_enable(struct drm_bridge *bridge) list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) { if (iter->funcs->pre_enable) iter->funcs->pre_enable(iter); + + if (iter == bridge) + break; } } EXPORT_SYMBOL(drm_bridge_chain_pre_enable);