2022-06-01 20:19:47

by Jiabing Wan

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 <[email protected]>
---
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

2022-06-06 21:21:28

by Stephen Boyd

Subject: Re: [PATCH] leds: Add of_node_put() before return

Quoting Wan Jiabing (2022-06-01 00:52:03)
> 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 <[email protected]>
> ---

Reviewed-by: Stephen Boyd <[email protected]>