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[2/3] backlight: max8925_bl: fix device-tree node lookup

Message ID 20171113102049.9342-2-johan@kernel.org (mailing list archive)
State New, archived
Headers show

Commit Message

Johan Hovold Nov. 13, 2017, 10:20 a.m. UTC 
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,
while the child backlight node was leaked.

Fixes: 47ec340cb8e2 ("mfd: max8925: Support dt for backlight")
Cc: stable <stable@vger.kernel.org>     # 3.9
Cc: Qing Xu <qingx@marvell.com>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/video/backlight/max8925_bl.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox

Patch

diff --git a/drivers/video/backlight/max8925_bl.c b/drivers/video/backlight/max8925_bl.c
index 7b738d60ecc2..f3aa6088f1d9 100644
--- a/drivers/video/backlight/max8925_bl.c
+++ b/drivers/video/backlight/max8925_bl.c
@@ -116,7 +116,7 @@  static void max8925_backlight_dt_init(struct platform_device *pdev)
 	if (!pdata)
 		return;
 
-	np = of_find_node_by_name(nproot, "backlight");
+	np = of_get_child_by_name(nproot, "backlight");
 	if (!np) {
 		dev_err(&pdev->dev, "failed to find backlight node\n");
 		return;
@@ -125,6 +125,8 @@  static void max8925_backlight_dt_init(struct platform_device *pdev)
 	if (!of_property_read_u32(np, "maxim,max8925-dual-string", &val))
 		pdata->dual_string = val;
 
+	of_node_put(np);
+
 	pdev->dev.platform_data = pdata;
 }