linux-kernel - [PATCH v2 07/18] drm/sun4i: DW HDMI: Release nodes if error happens during CRTC search

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Message-Id: <20180710203511.18454-8-jernej.skrabec@siol.net>
Date:   Tue, 10 Jul 2018 22:35:00 +0200
From:   Jernej Skrabec <jernej.skrabec@...l.net>
To:     maxime.ripard@...tlin.com, wens@...e.org, robh+dt@...nel.org
Cc:     airlied@...ux.ie, mark.rutland@....com,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: [PATCH v2 07/18] drm/sun4i: DW HDMI: Release nodes if error happens during CRTC search

If error happens in sun8i_dw_hdmi_find_possible_crtcs(), nodes are not
released with of_node_put() before returning.

Fix that by calling of_node_put() when necessary. While on it, clean up
the code by using of_graph_get_remote_node() which also lowers number of
cases where error handling has to be performed.

Fixes: 57e23de02f48 ("drm/sun4i: DW HDMI: Expand algorithm for possible crtcs")

Reviewed-by: Chen-Yu Tsai <wens@...e.org>
Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
---
 drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
index 3459b9ec56c9..21dc9ebad0b4 100644
--- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
+++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
@@ -53,22 +53,14 @@ static u32 sun8i_dw_hdmi_find_possible_crtcs(struct drm_device *drm,
 	struct device_node *port, *ep, *remote, *remote_port;
 	u32 crtcs = 0;
 
-	port = of_graph_get_port_by_id(node, 0);
-	if (!port)
-		return 0;
-
-	ep = of_get_next_available_child(port, NULL);
-	if (!ep)
-		return 0;
-
-	remote = of_graph_get_remote_port_parent(ep);
+	remote = of_graph_get_remote_node(node, 0, -1);
 	if (!remote)
 		return 0;
 
 	if (sun8i_dw_hdmi_node_is_tcon_top(remote)) {
 		port = of_graph_get_port_by_id(remote, 4);
 		if (!port)
-			return 0;
+			goto crtcs_exit;
 
 		for_each_child_of_node(port, ep) {
 			remote_port = of_graph_get_remote_port(ep);
@@ -81,6 +73,9 @@ static u32 sun8i_dw_hdmi_find_possible_crtcs(struct drm_device *drm,
 		crtcs = drm_of_find_possible_crtcs(drm, node);
 	}
 
+crtcs_exit:
+	of_node_put(remote);
+
 	return crtcs;
 }
 
-- 
2.18.0