linux-kernel - [PATCH v3 2/6] drm/meson: remove useless recursive components matching

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20211020123947.2585572-3-narmstrong@baylibre.com>
Date:   Wed, 20 Oct 2021 14:39:43 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     daniel@...ll.ch, Laurent.pinchart@...asonboard.com,
        sam@...nborg.org
Cc:     martin.blumenstingl@...glemail.com,
        dri-devel@...ts.freedesktop.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Neil Armstrong <narmstrong@...libre.com>
Subject: [PATCH v3 2/6] drm/meson: remove useless recursive components matching

The initial design was recursive to cover all port/endpoints, but only the first layer
of endpoints should be covered by the components list.
This also breaks the MIPI-DSI init/bridge attach sequence, thus only parse the
first endpoints instead of recursing.

Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
Acked-by: Sam Ravnborg <sam@...nborg.org>
Acked-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
 drivers/gpu/drm/meson/meson_drv.c | 62 +++++++++++--------------------
 1 file changed, 21 insertions(+), 41 deletions(-)

diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
index 7f41a33592c8..97ebc07357bb 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -426,46 +426,6 @@ static int compare_of(struct device *dev, void *data)
 	return dev->of_node == data;
 }
 
-/* Possible connectors nodes to ignore */
-static const struct of_device_id connectors_match[] = {
-	{ .compatible = "composite-video-connector" },
-	{ .compatible = "svideo-connector" },
-	{ .compatible = "hdmi-connector" },
-	{ .compatible = "dvi-connector" },
-	{}
-};
-
-static int meson_probe_remote(struct platform_device *pdev,
-			      struct component_match **match,
-			      struct device_node *parent,
-			      struct device_node *remote)
-{
-	struct device_node *ep, *remote_node;
-	int count = 1;
-
-	/* If node is a connector, return and do not add to match table */
-	if (of_match_node(connectors_match, remote))
-		return 1;
-
-	component_match_add(&pdev->dev, match, compare_of, remote);
-
-	for_each_endpoint_of_node(remote, ep) {
-		remote_node = of_graph_get_remote_port_parent(ep);
-		if (!remote_node ||
-		    remote_node == parent || /* Ignore parent endpoint */
-		    !of_device_is_available(remote_node)) {
-			of_node_put(remote_node);
-			continue;
-		}
-
-		count += meson_probe_remote(pdev, match, remote, remote_node);
-
-		of_node_put(remote_node);
-	}
-
-	return count;
-}
-
 static void meson_drv_shutdown(struct platform_device *pdev)
 {
 	struct meson_drm *priv = dev_get_drvdata(&pdev->dev);
@@ -477,6 +437,13 @@ static void meson_drv_shutdown(struct platform_device *pdev)
 	drm_atomic_helper_shutdown(priv->drm);
 }
 
+/* Possible connectors nodes to ignore */
+static const struct of_device_id connectors_match[] = {
+	{ .compatible = "composite-video-connector" },
+	{ .compatible = "svideo-connector" },
+	{}
+};
+
 static int meson_drv_probe(struct platform_device *pdev)
 {
 	struct component_match *match = NULL;
@@ -491,8 +458,21 @@ static int meson_drv_probe(struct platform_device *pdev)
 			continue;
 		}
 
-		count += meson_probe_remote(pdev, &match, np, remote);
+		/* If an analog connector is detected, count it as an output */
+		if (of_match_node(connectors_match, remote)) {
+			++count;
+			of_node_put(remote);
+			continue;
+		}
+
+		dev_dbg(&pdev->dev, "parent %pOF remote match add %pOF parent %s\n",
+			np, remote, dev_name(&pdev->dev));
+
+		component_match_add(&pdev->dev, &match, compare_of, remote);
+
 		of_node_put(remote);
+
+		++count;
 	}
 
 	if (count && !match)
-- 
2.25.1