Hi Laurent,
sorry, you're right, this patch should not be needed.
the connector should be cleanup by drm_mode_config_cleanup->drm_connector_put.
i did that in analogix_dp is to avoid a use-after-free issue not kmemleak, because the connector was allocated/freed in analogix_dp's bind/unbind.
but i found a kmemleak issue(dma_mask not freed) in dw-hdmi when testing that, will send patch soon.
On 03/03/2018 08:20 AM, JeffyChen wrote:
Hi Laurent,
On 03/03/2018 05:49 AM, Laurent Pinchart wrote:
Hi Enric,
Thank you for the patch.
On Friday, 2 March 2018 19:57:57 EET Enric Balletbo i Serra wrote:
From: Jeffy Chen jeffy.chen@rock-chips.com
We inited connector in attach(), so need a detach() to cleanup.
Do we ? The dw-hdmi driver already sets drm_connector_cleanup() as the connector .destroy() handler, and the .destroy() operation is called by the DRM core. None of the other bridge drivers call drm_connector_cleanup() directly.
hmmm, checking the code, there are also lots of drivers do the cleanup(drm_connector_cleanup or funcs->destroy): drm# grep -r "connector.*funcs->destroy" . ./rockchip/inno_hdmi.c: hdmi->connector.funcs->destroy(&hdmi->connector); ./rockchip/cdn-dp-core.c: connector->funcs->destroy(connector); ./bridge/analogix/analogix_dp_core.c: dp->connector.funcs->destroy(&dp->connector); ./msm/hdmi/hdmi.c: hdmi->connector->funcs->destroy(hdmi->connector); ./msm/dsi/dsi.c: msm_dsi->connector->funcs->destroy(msm_dsi->connector); ./msm/edp/edp.c: edp->connector->funcs->destroy(edp->connector); ./zte/zx_hdmi.c: hdmi->connector.funcs->destroy(&hdmi->connector); ./drm_connector.c: connector->funcs->destroy(connector); ./drm_connector.c: connector->funcs->destroy(connector); ./nouveau/dispnv04/disp.c: connector->funcs->destroy(connector); ./nouveau/nv50_display.c: mstc->connector.funcs->destroy(&mstc->connector); ./nouveau/nv50_display.c: connector->funcs->destroy(connector);
when i debug analogix_dp bind/unbind, i found that we need to cleanup the connector(reported by kmemleak). so i added it to ./bridge/analogix/analogix_dp_core.c...after that i saw dw-hdmi missing that too(by checking the code), so make this patch.
but i didn't really tested it on devices using dw-hdmi, so i'm not very sure the dw-hdmi(maybe also other bridges) is the same with analogix_dp.
i can try to find a chromebook veyron to check it next week :)
but even there's a leak, i'm still not very sure about: should the caller of drm_connector_init cleanup it or the caller of drm_bridge_attach should do it(for example analogix_dp_bind/analogix_dp_unbind) or should the DRM core take care of that?
Signed-off-by: Jeffy Chen jeffy.chen@rock-chips.com Signed-off-by: Thierry Escande thierry.escande@collabora.com Signed-off-by: Enric Balletbo i Serra enric.balletbo@collabora.com