Re: [PATCH v9 5/5] drm/bridge/synopsys: dw-hdmi: Add missing bridge detach

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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@xxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxx>
Signed-off-by: Thierry Escande <thierry.escande@xxxxxxxxxxxxx>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>
---

Changes in v9: None

  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 8 ++++++++
  1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index
f9802399cc0d..5626922f95f9 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -1985,6 +1985,13 @@ static int dw_hdmi_bridge_attach(struct drm_bridge
*bridge) return 0;
  }

+static void dw_hdmi_bridge_detach(struct drm_bridge *bridge)
+{
+	struct dw_hdmi *hdmi = bridge->driver_private;
+
+	drm_connector_cleanup(&hdmi->connector);
+}
+
  static enum drm_mode_status
  dw_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
  			  const struct drm_display_mode *mode)
@@ -2041,6 +2048,7 @@ static void dw_hdmi_bridge_enable(struct drm_bridge
*bridge)

  static const struct drm_bridge_funcs dw_hdmi_bridge_funcs = {
  	.attach = dw_hdmi_bridge_attach,
+	.detach = dw_hdmi_bridge_detach,
  	.enable = dw_hdmi_bridge_enable,
  	.disable = dw_hdmi_bridge_disable,
  	.mode_set = dw_hdmi_bridge_mode_set,



_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel




[Index of Archives]     [Linux DRI Users]     [Linux Intel Graphics]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux