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* [PATCH 1/3] backlight: as3711_bl: fix device-tree node lookup
@ 2017-11-13 10:20 Johan Hovold
  2017-11-13 10:20 ` [PATCH 2/3] backlight: max8925_bl: " Johan Hovold
                   ` (2 more replies)
  0 siblings, 3 replies; 13+ messages in thread
From: Johan Hovold @ 2017-11-13 10:20 UTC (permalink / raw)
  To: Lee Jones
  Cc: Daniel Thompson, Jingoo Han, dri-devel, linux-fbdev, linux-kernel,
	Johan Hovold, stable, Guennadi Liakhovetski

Fix child-node lookup during probe, which ended up searching the whole
device tree depth-first starting at the parent rather than just matching
on its children.

To make things worse, the parent mfd node was also prematurely freed.

Note that the nodes returned from the two calls to of_parse_phandle()
are also leaking, but fixing that is a bit more involved as pointers to
node fields are being stored for later use.

Fixes: 59eb2b5e57ea ("drivers/video/backlight/as3711_bl.c: add OF support")
Cc: stable <stable@vger.kernel.org>     # 3.10
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/video/backlight/as3711_bl.c | 35 +++++++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 10 deletions(-)

diff --git a/drivers/video/backlight/as3711_bl.c b/drivers/video/backlight/as3711_bl.c
index 734a9158946b..21ce56053c88 100644
--- a/drivers/video/backlight/as3711_bl.c
+++ b/drivers/video/backlight/as3711_bl.c
@@ -262,15 +262,16 @@ static int as3711_bl_register(struct platform_device *pdev,
 static int as3711_backlight_parse_dt(struct device *dev)
 {
 	struct as3711_bl_pdata *pdata = dev_get_platdata(dev);
-	struct device_node *bl -		of_find_node_by_name(dev->parent->of_node, "backlight"), *fb;
+	struct device_node *bl, *fb;
 	int ret;
 
+	bl = of_get_child_by_name(dev->parent->of_node, "backlight");
 	if (!bl) {
 		dev_dbg(dev, "backlight node not found\n");
 		return -ENODEV;
 	}
 
+	/* FIXME: need to drop reference to returned node */
 	fb = of_parse_phandle(bl, "su1-dev", 0);
 	if (fb) {
 		pdata->su1_fb = fb->full_name;
@@ -279,9 +280,10 @@ static int as3711_backlight_parse_dt(struct device *dev)
 		if (pdata->su1_max_uA <= 0)
 			ret = -EINVAL;
 		if (ret < 0)
-			return ret;
+			goto err_put_bl;
 	}
 
+	/* FIXME: need to drop reference to returned node */
 	fb = of_parse_phandle(bl, "su2-dev", 0);
 	if (fb) {
 		int count = 0;
@@ -292,7 +294,7 @@ static int as3711_backlight_parse_dt(struct device *dev)
 		if (pdata->su2_max_uA <= 0)
 			ret = -EINVAL;
 		if (ret < 0)
-			return ret;
+			goto err_put_bl;
 
 		if (of_find_property(bl, "su2-feedback-voltage", NULL)) {
 			pdata->su2_feedback = AS3711_SU2_VOLTAGE;
@@ -314,8 +316,10 @@ static int as3711_backlight_parse_dt(struct device *dev)
 			pdata->su2_feedback = AS3711_SU2_CURR_AUTO;
 			count++;
 		}
-		if (count != 1)
-			return -EINVAL;
+		if (count != 1) {
+			ret = -EINVAL;
+			goto err_put_bl;
+		}
 
 		count = 0;
 		if (of_find_property(bl, "su2-fbprot-lx-sd4", NULL)) {
@@ -334,8 +338,10 @@ static int as3711_backlight_parse_dt(struct device *dev)
 			pdata->su2_fbprot = AS3711_SU2_GPIO4;
 			count++;
 		}
-		if (count != 1)
-			return -EINVAL;
+		if (count != 1) {
+			ret = -EINVAL;
+			goto err_put_bl;
+		}
 
 		count = 0;
 		if (of_find_property(bl, "su2-auto-curr1", NULL)) {
@@ -355,11 +361,20 @@ static int as3711_backlight_parse_dt(struct device *dev)
 		 * At least one su2-auto-curr* must be specified iff
 		 * AS3711_SU2_CURR_AUTO is used
 		 */
-		if (!count ^ (pdata->su2_feedback != AS3711_SU2_CURR_AUTO))
-			return -EINVAL;
+		if (!count ^ (pdata->su2_feedback != AS3711_SU2_CURR_AUTO)) {
+			ret = -EINVAL;
+			goto err_put_bl;
+		}
 	}
 
+	of_node_put(bl);
+
 	return 0;
+
+err_put_bl:
+	of_node_put(bl);
+
+	return ret;
 }
 
 static int as3711_backlight_probe(struct platform_device *pdev)
-- 
2.15.0


^ permalink raw reply related	[flat|nested] 13+ messages in thread

end of thread, other threads:[~2017-11-20 13:04 UTC | newest]

Thread overview: 13+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2017-11-13 10:20 [PATCH 1/3] backlight: as3711_bl: fix device-tree node lookup Johan Hovold
2017-11-13 10:20 ` [PATCH 2/3] backlight: max8925_bl: " Johan Hovold
2017-11-13 13:57   ` Daniel Thompson
2017-11-13 10:20 ` [PATCH 3/3] backlight: tps65217_bl: " Johan Hovold
2017-11-13 13:55   ` Daniel Thompson
2017-11-13 14:16 ` [PATCH 1/3] backlight: as3711_bl: " Daniel Thompson
2017-11-14 18:05   ` Johan Hovold
2017-11-14 19:48     ` Daniel Thompson
2017-11-15 13:49       ` Johan Hovold
2017-11-15 14:32         ` Lee Jones
2017-11-15 14:39           ` Johan Hovold
2017-11-20 10:49             ` Johan Hovold
2017-11-20 13:04               ` Lee Jones

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