linux-kernel - [PATCH 07/12] drm: omapdrm: add missing of_node_put after of_device_is

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Date:   Sat, 23 Feb 2019 14:20:38 +0100
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Tomi Valkeinen <tomi.valkeinen@...com>
Cc:     kernel-janitors@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 07/12] drm: omapdrm: add missing of_node_put after of_device_is_available

Add an of_node_put when a tested device node is not available.

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

// <smpl>
@@
identifier f;
local idexpression e;
expression x;
@@

e = f(...);
... when != of_node_put(e)
    when != x = e
    when != e = x
    when any
if (<+...of_device_is_available(e)...+>) {
  ... when != of_node_put(e)
(
  return e;
|
+ of_node_put(e);
  return ...;
)
}
// </smpl>

Fixes: f2dd36ac9974c ("OMAPDSS: move 'compatible' converter to omapdss driver")
Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/gpu/drm/omapdrm/dss/omapdss-boot-init.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff -u -p a/drivers/gpu/drm/omapdrm/dss/omapdss-boot-init.c b/drivers/gpu/drm/omapdrm/dss/omapdss-boot-init.c
--- a/drivers/gpu/drm/omapdrm/dss/omapdss-boot-init.c
+++ b/drivers/gpu/drm/omapdrm/dss/omapdss-boot-init.c
@@ -192,8 +192,10 @@ static int __init omapdss_boot_init(void
 
 	dss = of_find_matching_node(NULL, omapdss_of_match);
 
-	if (dss == NULL || !of_device_is_available(dss))
+	if (dss == NULL || !of_device_is_available(dss)) {
+		of_node_put(dss);
 		return 0;
+	}
 
 	omapdss_walk_device(dss, true);