[PATCH 4.9 112/120] bus: vexpress-config: fix device reference leak

From: Greg Kroah-Hartman
Date: Wed Jan 18 2017 - 05:59:17 EST


4.9-stable review patch. If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@xxxxxxxxxx>

commit c090959b9dd8c87703e275079aa4b4a824ba3f8e upstream.

Make sure to drop the reference to the parent device taken by
class_find_device() after populating the bus.

Fixes: 3b9334ac835b ("mfd: vexpress: Convert custom func API to regmap")
Acked-by: Sudeep Holla <sudeep.holla@xxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/bus/vexpress-config.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/bus/vexpress-config.c
+++ b/drivers/bus/vexpress-config.c
@@ -171,6 +171,7 @@ static int vexpress_config_populate(stru
{
struct device_node *bridge;
struct device *parent;
+ int ret;

bridge = of_parse_phandle(node, "arm,vexpress,config-bridge", 0);
if (!bridge)
@@ -182,7 +183,11 @@ static int vexpress_config_populate(stru
if (WARN_ON(!parent))
return -ENODEV;

- return of_platform_populate(node, NULL, NULL, parent);
+ ret = of_platform_populate(node, NULL, NULL, parent);
+
+ put_device(parent);
+
+ return ret;
}

static int __init vexpress_config_init(void)