[PATCH] leds: powernv: add of_node_put()

of_find_node_by_path() acquires a reference to the node returned by
it and that reference needs to be dropped by its caller.bl_idle_init()
doesn't do that, so fix it.

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
---
 drivers/leds/leds-powernv.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/leds/leds-powernv.c b/drivers/leds/leds-powernv.c
index b1adbd70ce2e..0b1540029034 100644
--- a/drivers/leds/leds-powernv.c
+++ b/drivers/leds/leds-powernv.c

@@ -285,6 +285,7 @@ static int powernv_led_probe(struct platform_device *pdev)
 	struct device_node *led_node;
 	struct powernv_led_common *powernv_led_common;
 	struct device *dev = &pdev->dev;
+	int rc;
 
 	led_node = of_find_node_by_path("/ibm,opal/leds");
 	if (!led_node) {

@@ -295,15 +296,20 @@ static int powernv_led_probe(struct platform_device *pdev)
 
 	powernv_led_common = devm_kzalloc(dev, sizeof(*powernv_led_common),
 					  GFP_KERNEL);
-	if (!powernv_led_common)
-		return -ENOMEM;
+	if (!powernv_led_common){
+		rc = -ENOMEM;
+		goto out;
+	}
 
 	mutex_init(&powernv_led_common->lock);
 	powernv_led_common->max_led_type = cpu_to_be64(OPAL_SLOT_LED_TYPE_MAX);
 
 	platform_set_drvdata(pdev, powernv_led_common);
 
-	return powernv_led_classdev(pdev, led_node, powernv_led_common);
+	rc = powernv_led_classdev(pdev, led_node, powernv_led_common);
+out:
+	of_node_put(led_node);
+	return rc;
 }
 
 /* Platform driver remove */

-- 
2.17.0

Hi Yangtao,

Thank you for the patch.

On 11/21/2018 01:31 PM, Yangtao Li wrote:

of_find_node_by_path() acquires a reference to the node returned by
it and that reference needs to be dropped by its caller.bl_idle_init()
doesn't do that, so fix it.

s/bl_idle_init/powernv_led_probe/

I suppose that you adopted the commit message from a fix
for drivers/cpuidle/cpuidle-big_little.c.

missing space:

s/){/) {/

+		rc = -ENOMEM;
+		goto out;
+	}
 
 	mutex_init(&powernv_led_common->lock);
 	powernv_led_common->max_led_type = cpu_to_be64(OPAL_SLOT_LED_TYPE_MAX);
 
 	platform_set_drvdata(pdev, powernv_led_common);
 
-	return powernv_led_classdev(pdev, led_node, powernv_led_common);
+	rc = powernv_led_classdev(pdev, led_node, powernv_led_common);
+out:
+	of_node_put(led_node);
+	return rc;
 }
 
 /* Platform driver remove */

I've fixed those trivial problems and applied the patch
to the for-next branch of linux-leds.git.

-- 
Best regards,
Jacek Anaszewski

On Thu, Nov 22, 2018 at 4:45 AM Jacek Anaszewski
[off-list ref] wrote:

Hi Yangtao,

Thank you for the patch.

On 11/21/2018 01:31 PM, Yangtao Li wrote:

quoted

of_find_node_by_path() acquires a reference to the node returned by
it and that reference needs to be dropped by its caller.bl_idle_init()
doesn't do that, so fix it.

s/bl_idle_init/powernv_led_probe/

I suppose that you adopted the commit message from a fix
for drivers/cpuidle/cpuidle-big_little.c.

quoted

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
---
 drivers/leds/leds-powernv.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/leds/leds-powernv.c b/drivers/leds/leds-powernv.c
index b1adbd70ce2e..0b1540029034 100644
--- a/drivers/leds/leds-powernv.c
+++ b/drivers/leds/leds-powernv.c

@@ -285,6 +285,7 @@ static int powernv_led_probe(struct platform_device *pdev)
      struct device_node *led_node;
      struct powernv_led_common *powernv_led_common;
      struct device *dev = &pdev->dev;
+     int rc;

      led_node = of_find_node_by_path("/ibm,opal/leds");
      if (!led_node) {

@@ -295,15 +296,20 @@ static int powernv_led_probe(struct platform_device *pdev)

      powernv_led_common = devm_kzalloc(dev, sizeof(*powernv_led_common),
                                        GFP_KERNEL);
-     if (!powernv_led_common)
-             return -ENOMEM;
+     if (!powernv_led_common){

missing space:

s/){/) {/

quoted

+             rc = -ENOMEM;
+             goto out;
+     }

      mutex_init(&powernv_led_common->lock);
      powernv_led_common->max_led_type = cpu_to_be64(OPAL_SLOT_LED_TYPE_MAX);

      platform_set_drvdata(pdev, powernv_led_common);

-     return powernv_led_classdev(pdev, led_node, powernv_led_common);
+     rc = powernv_led_classdev(pdev, led_node, powernv_led_common);
+out:
+     of_node_put(led_node);
+     return rc;
 }

 /* Platform driver remove */

I've fixed those trivial problems and applied the patch
to the for-next branch of linux-leds.git.

--
Best regards,
Jacek Anaszewski

Jacek,

Yeah,I forget to modify the changlog.

Thanks,
    Yangtao