linux-kernel - [PATCH] leds: Add of_node

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Date:   Wed,  1 Jun 2022 15:52:03 +0800
From:   Wan Jiabing <wanjiabing@...o.com>
To:     Pavel Machek <pavel@....cz>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Satya Priya <quic_c_skakit@...cinc.com>,
        Wan Jiabing <wanjiabing@...o.com>, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] leds: Add of_node_put() before return

Fix following coccicheck warning:
drivers/leds/rgb/leds-qcom-lpg.c:1107:2-34: WARNING: Function for_each_available_child_of_node should have of_node_put() before return around line 1110.
drivers/leds/rgb/leds-qcom-lpg.c:1286:1-33: WARNING: Function for_each_available_child_of_node should have of_node_put() before return around line 1289.

Early exits from for_each_available_child_of_node should decrement the
node reference counter.

Fixes: 24e2d05d1b68 ("leds: Add driver for Qualcomm LPG")
Signed-off-by: Wan Jiabing <wanjiabing@...o.com>
---
 drivers/leds/rgb/leds-qcom-lpg.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/leds/rgb/leds-qcom-lpg.c b/drivers/leds/rgb/leds-qcom-lpg.c
index 02f51cc61837..05f064543444 100644
--- a/drivers/leds/rgb/leds-qcom-lpg.c
+++ b/drivers/leds/rgb/leds-qcom-lpg.c
@@ -1106,8 +1106,10 @@ static int lpg_add_led(struct lpg *lpg, struct device_node *np)
 		i = 0;
 		for_each_available_child_of_node(np, child) {
 			ret = lpg_parse_channel(lpg, child, &led->channels[i]);
-			if (ret < 0)
+			if (ret < 0) {
+				of_node_put(child);
 				return ret;
+			}
 
 			info[i].color_index = led->channels[i]->color;
 			info[i].intensity = 0;
@@ -1285,8 +1287,10 @@ static int lpg_probe(struct platform_device *pdev)
 
 	for_each_available_child_of_node(pdev->dev.of_node, np) {
 		ret = lpg_add_led(lpg, np);
-		if (ret)
+		if (ret) {
+			of_node_put(np);
 			return ret;
+		}
 	}
 
 	for (i = 0; i < lpg->num_channels; i++)
-- 
2.36.1