From d5318d302e7cf6583ec85a2a8bfbb3a3910ae372 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Mon, 20 Nov 2017 11:45:47 +0100
Subject: [PATCH] backlight: as3711_bl: Fix Device Tree node leaks
Git-commit: d5318d302e7cf6583ec85a2a8bfbb3a3910ae372
Patch-mainline: v4.18-rc1
References: bsc#1051510

Two framebuffer device-node names were looked up during probe, but were
only used as flags to indicate the presence of two framebuffer device.

Drop the unused framebuffer name along with a likewise unused device
pointer from the driver data, and update the platform data to pass in
booleans instead of the framebuffer strings. This allows us do drop the
node references acquired during probe, which would otherwise leak.

Note that there are no other in-kernel users of the modified
platform-data fields.

Fixes: 59eb2b5e57ea ("drivers/video/backlight/as3711_bl.c: add OF support")
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/video/backlight/as3711_bl.c | 12 ++++++------
 include/linux/mfd/as3711.h          |  4 ++--
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/video/backlight/as3711_bl.c b/drivers/video/backlight/as3711_bl.c
index e55304d5cf07..ca544aa764b8 100644
--- a/drivers/video/backlight/as3711_bl.c
+++ b/drivers/video/backlight/as3711_bl.c
@@ -28,8 +28,6 @@ enum as3711_bl_type {
 
 struct as3711_bl_data {
 	bool powered;
-	const char *fb_name;
-	struct device *fb_dev;
 	enum as3711_bl_type type;
 	int brightness;
 	struct backlight_device *bl;
@@ -273,7 +271,9 @@ static int as3711_backlight_parse_dt(struct device *dev)
 
 	fb = of_parse_phandle(bl, "su1-dev", 0);
 	if (fb) {
-		pdata->su1_fb = fb->full_name;
+		of_node_put(fb);
+
+		pdata->su1_fb = true;
 
 		ret = of_property_read_u32(bl, "su1-max-uA", &pdata->su1_max_uA);
 		if (pdata->su1_max_uA <= 0)
@@ -286,7 +286,9 @@ static int as3711_backlight_parse_dt(struct device *dev)
 	if (fb) {
 		int count = 0;
 
-		pdata->su2_fb = fb->full_name;
+		of_node_put(fb);
+
+		pdata->su2_fb = true;
 
 		ret = of_property_read_u32(bl, "su2-max-uA", &pdata->su2_max_uA);
 		if (pdata->su2_max_uA <= 0)
@@ -425,7 +427,6 @@ static int as3711_backlight_probe(struct platform_device *pdev)
 
 	if (pdata->su1_fb) {
 		su = &supply->su1;
-		su->fb_name = pdata->su1_fb;
 		su->type = AS3711_BL_SU1;
 
 		max_brightness = min(pdata->su1_max_uA, 31);
@@ -436,7 +437,6 @@ static int as3711_backlight_probe(struct platform_device *pdev)
 
 	if (pdata->su2_fb) {
 		su = &supply->su2;
-		su->fb_name = pdata->su2_fb;
 		su->type = AS3711_BL_SU2;
 
 		switch (pdata->su2_fbprot) {
diff --git a/include/linux/mfd/as3711.h b/include/linux/mfd/as3711.h
index 34cc85864be5..ddd0b953323b 100644
--- a/include/linux/mfd/as3711.h
+++ b/include/linux/mfd/as3711.h
@@ -108,9 +108,9 @@ struct as3711_regulator_pdata {
 };
 
 struct as3711_bl_pdata {
-	const char *su1_fb;
+	bool su1_fb;
 	int su1_max_uA;
-	const char *su2_fb;
+	bool su2_fb;
 	int su2_max_uA;
 	enum as3711_su2_feedback su2_feedback;
 	enum as3711_su2_fbprot su2_fbprot;
-- 
2.18.0