linux-kernel - [PATCH] media: atmel-isi: move of_node_put() to cover success branch as well

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Date:   Fri,  1 Jun 2018 13:30:14 +0000
From:   Nicholas Mc Guire <hofrat@...ntech.at>
To:     Ludovic Desroches <ludovic.desroches@...rochip.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH] media: atmel-isi: move of_node_put() to cover success branch as well

From: Nicholas Mc Guire <hofrat@...dl.org>

The of_node_put() was only covering the error branch but missed the 
success branch so the refcount for ep which 
of_graph_get_remote_port_parent() incremented on success would was
not being decremented.

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
---

This patch is on top of: "media: atmel-isi: drop unnecessary while loop"

Patch was compile tested with: x86_64_defconfig + CONFIG_MEDIA_SUPPORT=y
MEDIA_CAMERA_SUPPORT=y, CONFIG_MEDIA_CONTROLLER=y, V4L_PLATFORM_DRIVERS=y
OF=y, CONFIG_COMPILE_TEST=y, CONFIG_VIDEO_ATMEL_ISI=y

Compile testing atmel-isi.c shows some sparse warnings. Seems to be due to
sizeof operator being applied to a union (not related to the function being
changed though).

Patch is against 4.17-rc7 (localversion-next is next-20180531)

 drivers/media/platform/atmel/atmel-isi.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/atmel/atmel-isi.c b/drivers/media/platform/atmel/atmel-isi.c
index 85fc7b9..e8db4df 100644
--- a/drivers/media/platform/atmel/atmel-isi.c
+++ b/drivers/media/platform/atmel/atmel-isi.c
@@ -1111,10 +1111,9 @@ static int isi_graph_parse(struct atmel_isi *isi, struct device_node *node)
 		return -EINVAL;
 
 	remote = of_graph_get_remote_port_parent(ep);
-	if (!remote) {
-		of_node_put(ep);
+	of_node_put(ep);
+	if (!remote)
 		return -EINVAL;
-	}
 
 	/* Remote node to connect */
 	isi->entity.node = remote;
-- 
2.1.4