drm/pl111: fix possible object reference leak

The call to of_find_matching_node_and_match returns a node pointer with
refcount incremented thus it must be explicitly decremented after the
last usage.

Detected by coccinelle with the following warnings:
drivers/gpu/drm/pl111/pl111_versatile.c:333:3-9: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 317, but without a corresponding object release within this function.
drivers/gpu/drm/pl111/pl111_versatile.c:340:3-9: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 317, but without a corresponding object release within this function.
drivers/gpu/drm/pl111/pl111_versatile.c:346:3-9: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 317, but without a corresponding object release within this function.
drivers/gpu/drm/pl111/pl111_versatile.c:354:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 317, but without a corresponding object release within this function.
drivers/gpu/drm/pl111/pl111_versatile.c:395:3-9: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 317, but without a corresponding object release within this function.
drivers/gpu/drm/pl111/pl111_versatile.c:402:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 317, but without a corresponding object release within this function.

Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Cc: Eric Anholt <eric@anholt.net> (supporter:DRM DRIVER FOR ARM PL111 CLCD)
Cc: David Airlie <airlied@linux.ie> (maintainer:DRM DRIVERS)
Cc: Daniel Vetter <daniel@ffwll.ch> (maintainer:DRM DRIVERS)
Cc: dri-devel@lists.freedesktop.org (open list:DRM DRIVERS)
Cc: linux-kernel@vger.kernel.org (open list)
Signed-off-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/1554307455-40361-6-git-send-email-wen.yang99@zte.com.cn

diff --git a/drivers/gpu/drm/pl111/pl111_versatile.c b/drivers/gpu/drm/pl111/pl111_versatile.c
index b9baefdba38a17e5c2647075e588748ecfecf980..1c318ad32a8cd39c48b354312277ea924d20f94f 100644 (file)
--- a/drivers/gpu/drm/pl111/pl111_versatile.c
+++ b/drivers/gpu/drm/pl111/pl111_versatile.c
@@ -330,6 +330,7 @@ int pl111_versatile_init(struct device *dev, struct pl111_drm_dev_private *priv)
                ret = vexpress_muxfpga_init();
                if (ret) {
                        dev_err(dev, "unable to initialize muxfpga driver\n");
+                       of_node_put(np);
                        return ret;
                }
 
@@ -337,17 +338,20 @@ int pl111_versatile_init(struct device *dev, struct pl111_drm_dev_private *priv)
                pdev = of_find_device_by_node(np);
                if (!pdev) {
                        dev_err(dev, "can't find the sysreg device, deferring\n");
+                       of_node_put(np);
                        return -EPROBE_DEFER;
                }
                map = dev_get_drvdata(&pdev->dev);
                if (!map) {
                        dev_err(dev, "sysreg has not yet probed\n");
                        platform_device_put(pdev);
+                       of_node_put(np);
                        return -EPROBE_DEFER;
                }
        } else {
                map = syscon_node_to_regmap(np);
        }
+       of_node_put(np);
 
        if (IS_ERR(map)) {
                dev_err(dev, "no Versatile syscon regmap\n");