linux-kernel - [WIP PATCH 06/15] drm/i915: Keep malloc references to MST ports

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Date:   Thu, 13 Dec 2018 20:25:35 -0500
From:   Lyude Paul <lyude@...hat.com>
To:     dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org
Cc:     Daniel Vetter <daniel@...ll.ch>, Dave Airlie <airlied@...il.com>,
        Harry Wentland <harry.wentland@....com>,
        Jerry Zuo <Jerry.Zuo@....com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org
Subject: [WIP PATCH 06/15] drm/i915: Keep malloc references to MST ports

So that the ports stay around until we've destroyed the connectors, in
order to ensure that we don't pass an invalid pointer to any MST helpers
once we introduce the new MST VCPI helpers.

Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 drivers/gpu/drm/i915/intel_connector.c | 4 ++++
 drivers/gpu/drm/i915/intel_dp_mst.c    | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_connector.c b/drivers/gpu/drm/i915/intel_connector.c
index 18e370f607bc..37d2c644f4b8 100644
--- a/drivers/gpu/drm/i915/intel_connector.c
+++ b/drivers/gpu/drm/i915/intel_connector.c
@@ -95,6 +95,10 @@ void intel_connector_destroy(struct drm_connector *connector)
 	intel_panel_fini(&intel_connector->panel);
 
 	drm_connector_cleanup(connector);
+
+	if (intel_connector->port)
+		drm_dp_mst_put_port_malloc(intel_connector->port);
+
 	kfree(connector);
 }
 
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index f05427b74e34..4d6ced34d465 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -484,6 +484,8 @@ static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
 	if (ret)
 		goto err;
 
+	drm_dp_mst_get_port_malloc(port);
+
 	return connector;
 
 err:
-- 
2.19.2