drm: remove the raw_edid field from struct drm_display_info

Neither the drm core nor any of the drivers really need the raw_edid field
of struct drm_display_info for anything. Instead of being useful, it
creates confusion about who is responsible for freeing the memory it points
to and setting the field to NULL afterwards, leading to memory leaks and
dangling pointers.

Remove the raw_edid field, and fix drivers as necessary.

Reported-by: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

13 files changed, 14 insertions, 50 deletions

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index a8743c3..bcc4725 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -399,10 +399,7 @@ struct edid *drm_get_edid(struct drm_connector *connector,
 	if (drm_probe_ddc(adapter))
 		edid = (struct edid *)drm_do_get_edid(connector, adapter);
 
-	connector->display_info.raw_edid = (char *)edid;
-
 	return edid;
-
 }
 EXPORT_SYMBOL(drm_get_edid);
 
diff --git a/drivers/gpu/drm/drm_edid_load.c b/drivers/gpu/drm/drm_edid_load.c
index 0303935d..186832e 100644
--- a/drivers/gpu/drm/drm_edid_load.c
+++ b/drivers/gpu/drm/drm_edid_load.c
@@ -114,8 +114,8 @@ static u8 generic_edid[GENERIC_EDIDS][128] = {
 	},
 };
 
-static int edid_load(struct drm_connector *connector, char *name,
-		     char *connector_name)
+static u8 *edid_load(struct drm_connector *connector, char *name,
+			char *connector_name)
 {
 	const struct firmware *fw;
 	struct platform_device *pdev;
@@ -205,7 +205,6 @@ static int edid_load(struct drm_connector *connector, char *name,
 		edid = new_edid;
 	}
 
-	connector->display_info.raw_edid = edid;
 	DRM_INFO("Got %s EDID base block and %d extension%s from "
 	    "\"%s\" for connector \"%s\"\n", builtin ? "built-in" :
 	    "external", valid_extensions, valid_extensions == 1 ? "" : "s",
@@ -215,7 +214,10 @@ relfw_out:
 	release_firmware(fw);
 
 out:
-	return err;
+	if (err)
+		return ERR_PTR(err);
+
+	return edid;
 }
 
 int drm_load_edid_firmware(struct drm_connector *connector)
@@ -223,6 +225,7 @@ int drm_load_edid_firmware(struct drm_connector *connector)
 	char *connector_name = drm_get_connector_name(connector);
 	char *edidname = edid_firmware, *last, *colon;
 	int ret;
+	struct edid *edid;
 
 	if (*edidname == '\0')
 		return 0;
@@ -240,13 +243,13 @@ int drm_load_edid_firmware(struct drm_connector *connector)
 	if (*last == '\n')
 		*last = '\0';
 
-	ret = edid_load(connector, edidname, connector_name);
-	if (ret)
+	edid = (struct edid *) edid_load(connector, edidname, connector_name);
+	if (IS_ERR_OR_NULL(edid))
 		return 0;
 
-	drm_mode_connector_update_edid_property(connector,
-	    (struct edid *) connector->display_info.raw_edid);
+	drm_mode_connector_update_edid_property(connector, edid);
+	ret = drm_add_edid_modes(connector, edid);
+	kfree(edid);
 
-	return drm_add_edid_modes(connector, (struct edid *)
-	    connector->display_info.raw_edid);
+	return ret;
 }
diff --git a/drivers/gpu/drm/exynos/exynos_drm_connector.c b/drivers/gpu/drm/exynos/exynos_drm_connector.c
index d956819..9dce3b9 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_connector.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_connector.c
@@ -147,9 +147,7 @@ static int exynos_drm_connector_get_modes(struct drm_connector *connector)
 
 		drm_mode_connector_update_edid_property(connector, edid);
 		count = drm_add_edid_modes(connector, edid);
-
-		kfree(connector->display_info.raw_edid);
-		connector->display_info.raw_edid = edid;
+		kfree(edid);
 	} else {
 		struct drm_display_mode *mode = drm_mode_create(connector->dev);
 		struct exynos_drm_panel_info *panel;
diff --git a/drivers/gpu/drm/exynos/exynos_drm_vidi.c b/drivers/gpu/drm/exynos/exynos_drm_vidi.c
index bb1550c..9239525 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_vidi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_vidi.c
@@ -102,7 +102,6 @@ static int vidi_get_edid(struct device *dev, struct drm_connector *connector,
 				u8 *edid, int len)
 {
 	struct vidi_context *ctx = get_vidi_context(dev);
-	struct edid *raw_edid;
 
 	DRM_DEBUG_KMS("%s\n", __FILE__);
 
@@ -115,18 +114,6 @@ static int vidi_get_edid(struct device *dev, struct drm_connector *connector,
 		return -EFAULT;
 	}
 
-	raw_edid = kzalloc(len, GFP_KERNEL);
-	if (!raw_edid) {
-		DRM_DEBUG_KMS("failed to allocate raw_edid.\n");
-		return -ENOMEM;
-	}
-
-	memcpy(raw_edid, ctx->raw_edid, min((1 + ctx->raw_edid->extensions)
-						* EDID_LENGTH, len));
-
-	/* attach the edid data to connector. */
-	connector->display_info.raw_edid = (char *)raw_edid;
-
 	memcpy(edid, ctx->raw_edid, min((1 + ctx->raw_edid->extensions)
 					* EDID_LENGTH, len));
 
diff --git a/drivers/gpu/drm/gma500/cdv_intel_hdmi.c b/drivers/gpu/drm/gma500/cdv_intel_hdmi.c
index 0c90f03..b1b77bb 100644
--- a/drivers/gpu/drm/gma500/cdv_intel_hdmi.c
+++ b/drivers/gpu/drm/gma500/cdv_intel_hdmi.c
@@ -157,8 +157,6 @@ static enum drm_connector_status cdv_hdmi_detect(
 			hdmi_priv->has_hdmi_audio =
 						drm_detect_monitor_audio(edid);
 		}
-
-		psb_intel_connector->base.display_info.raw_edid = NULL;
 		kfree(edid);
 	}
 	return status;
diff --git a/drivers/gpu/drm/gma500/oaktrail_hdmi.c b/drivers/gpu/drm/gma500/oaktrail_hdmi.c
index 2eb3dc4..69e51e90 100644
--- a/drivers/gpu/drm/gma500/oaktrail_hdmi.c
+++ b/drivers/gpu/drm/gma500/oaktrail_hdmi.c
@@ -252,7 +252,6 @@ static int oaktrail_hdmi_get_modes(struct drm_connector *connector)
 	if (edid) {
 		drm_mode_connector_update_edid_property(connector, edid);
 		ret = drm_add_edid_modes(connector, edid);
-		connector->display_info.raw_edid = NULL;
 	}
 
 	/*
diff --git a/drivers/gpu/drm/gma500/psb_intel_sdvo.c b/drivers/gpu/drm/gma500/psb_intel_sdvo.c
index 0466c7b..a453d94 100644
--- a/drivers/gpu/drm/gma500/psb_intel_sdvo.c
+++ b/drivers/gpu/drm/gma500/psb_intel_sdvo.c
@@ -1343,7 +1343,6 @@ psb_intel_sdvo_hdmi_sink_detect(struct drm_connector *connector)
 			}
 		} else
 			status = connector_status_disconnected;
-		connector->display_info.raw_edid = NULL;
 		kfree(edid);
 	}
 
@@ -1404,7 +1403,6 @@ psb_intel_sdvo_detect(struct drm_connector *connector, bool force)
 				ret = connector_status_disconnected;
 			else
 				ret = connector_status_connected;
-			connector->display_info.raw_edid = NULL;
 			kfree(edid);
 		} else
 			ret = connector_status_connected;
@@ -1453,7 +1451,6 @@ static void psb_intel_sdvo_get_ddc_modes(struct drm_connector *connector)
 			drm_add_edid_modes(connector, edid);
 		}
 
-		connector->display_info.raw_edid = NULL;
 		kfree(edid);
 	}
 }
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 977d9d2..d14b1e3 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2145,7 +2145,6 @@ intel_dp_get_edid_modes(struct drm_connector *connector, struct i2c_adapter *ada
 		ret = drm_add_edid_modes(connector, intel_dp->edid);
 		drm_edid_to_eld(connector,
 				intel_dp->edid);
-		connector->display_info.raw_edid = NULL;
 		return intel_dp->edid_mode_count;
 	}
 
@@ -2191,7 +2190,6 @@ intel_dp_detect(struct drm_connector *connector, bool force)
 		edid = intel_dp_get_edid(connector, &intel_dp->adapter);
 		if (edid) {
 			intel_dp->has_audio = drm_detect_monitor_audio(edid);
-			connector->display_info.raw_edid = NULL;
 			kfree(edid);
 		}
 	}
@@ -2256,8 +2254,6 @@ intel_dp_detect_audio(struct drm_connector *connector)
 	edid = intel_dp_get_edid(connector, &intel_dp->adapter);
 	if (edid) {
 		has_audio = drm_detect_monitor_audio(edid);
-
-		connector->display_info.raw_edid = NULL;
 		kfree(edid);
 	}
 
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index e4c37bb..35a6ee7 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -737,7 +737,6 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
 						drm_detect_hdmi_monitor(edid);
 			intel_hdmi->has_audio = drm_detect_monitor_audio(edid);
 		}
-		connector->display_info.raw_edid = NULL;
 		kfree(edid);
 	}
 
@@ -778,8 +777,6 @@ intel_hdmi_detect_audio(struct drm_connector *connector)
 	if (edid) {
 		if (edid->input & DRM_EDID_INPUT_DIGITAL)
 			has_audio = drm_detect_monitor_audio(edid);
-
-		connector->display_info.raw_edid = NULL;
 		kfree(edid);
 	}
 
diff --git a/drivers/gpu/drm/i915/intel_modes.c b/drivers/gpu/drm/i915/intel_modes.c
index 45848b9..7a5238f 100644
--- a/drivers/gpu/drm/i915/intel_modes.c
+++ b/drivers/gpu/drm/i915/intel_modes.c
@@ -50,7 +50,6 @@ int intel_ddc_get_modes(struct drm_connector *connector,
 		drm_mode_connector_update_edid_property(connector, edid);
 		ret = drm_add_edid_modes(connector, edid);
 		drm_edid_to_eld(connector, edid);
-		connector->display_info.raw_edid = NULL;
 		kfree(edid);
 	}
 
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index 5fb425b..434b1d1 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -1345,7 +1345,6 @@ intel_sdvo_tmds_sink_detect(struct drm_connector *connector)
 			}
 		} else
 			status = connector_status_disconnected;
-		connector->display_info.raw_edid = NULL;
 		kfree(edid);
 	}
 
@@ -1419,7 +1418,6 @@ intel_sdvo_detect(struct drm_connector *connector, bool force)
 			else
 				ret = connector_status_disconnected;
 
-			connector->display_info.raw_edid = NULL;
 			kfree(edid);
 		} else
 			ret = connector_status_connected;
@@ -1465,7 +1463,6 @@ static void intel_sdvo_get_ddc_modes(struct drm_connector *connector)
 			drm_add_edid_modes(connector, edid);
 		}
 
-		connector->display_info.raw_edid = NULL;
 		kfree(edid);
 	}
 }
diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index b69642d..c7420e8 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -1399,7 +1399,6 @@ static int mga_vga_get_modes(struct drm_connector *connector)
 	if (edid) {
 		drm_mode_connector_update_edid_property(connector, edid);
 		ret = drm_add_edid_modes(connector, edid);
-		connector->display_info.raw_edid = NULL;
 		kfree(edid);
 	}
 	return ret;
diff --git a/drivers/gpu/drm/udl/udl_connector.c b/drivers/gpu/drm/udl/udl_connector.c
index ba055e9..2d98ff9 100644
--- a/drivers/gpu/drm/udl/udl_connector.c
+++ b/drivers/gpu/drm/udl/udl_connector.c
@@ -57,11 +57,8 @@ static int udl_get_modes(struct drm_connector *connector)
 
 	edid = (struct edid *)udl_get_edid(udl);
 
-	connector->display_info.raw_edid = (char *)edid;
-
 	drm_mode_connector_update_edid_property(connector, edid);
 	ret = drm_add_edid_modes(connector, edid);
-	connector->display_info.raw_edid = NULL;
 	kfree(edid);
 	return ret;
 }