linux-kernel - [PATCH 4.20 053/111] drm/rockchip: add missing of_node

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Date:   Mon, 21 Jan 2019 14:42:47 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Julia Lawall <Julia.Lawall@...6.fr>,
        Heiko Stuebner <heiko@...ech.de>
Subject: [PATCH 4.20 053/111] drm/rockchip: add missing of_node_put

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Julia Lawall <Julia.Lawall@...6.fr>

commit a17ce9960b3628b9f546c454741a1cad551d5695 upstream.

The device node iterators perform an of_node_get on each iteration, so a
jump out of the loop requires an of_node_put.

The semantic patch that fixes this problem is as follows
(http://coccinelle.lip6.fr):

// <smpl>
@@
expression root,e;
local idexpression child;
iterator name for_each_child_of_node;
@@

 for_each_child_of_node(root, child) {
   ... when != of_node_put(child)
       when != e = child
+  of_node_put(child);
?  break;
   ...
}
... when != child
// </smpl>

Fixes: 1f0f01515172 ("drm/rockchip: Add support for Rockchip Soc RGB output interface")
Cc: stable@...r.kernel.org
Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
[added fixes and cc-stable]
Signed-off-by: Heiko Stuebner <heiko@...ech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/1547369264-24831-4-git-send-email-Julia.Lawall@lip6.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/rockchip/rockchip_rgb.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/rockchip/rockchip_rgb.c
+++ b/drivers/gpu/drm/rockchip/rockchip_rgb.c
@@ -113,8 +113,10 @@ struct rockchip_rgb *rockchip_rgb_init(s
 		child_count++;
 		ret = drm_of_find_panel_or_bridge(dev->of_node, 0, endpoint_id,
 						  &panel, &bridge);
-		if (!ret)
+		if (!ret) {
+			of_node_put(endpoint);
 			break;
+		}
 	}
 
 	of_node_put(port);