diff mbox series

[v3] powerpc:85xx: Add missing of_node_put() in sgy_cst1000

Message ID 20220617052214.4004188-1-windhl@126.com (mailing list archive)
State Superseded
Headers show
Series [v3] powerpc:85xx: Add missing of_node_put() in sgy_cst1000 | expand

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Commit Message

Liang He June 17, 2022, 5:22 a.m. UTC 
In gpio_halt_probe(), of_find_matching_node() will return a node
pointer with refcount incremented. We should use of_node_put() in
fail path or when it is not used anymore.

Signed-off-by: Liang He <windhl@126.com>
---
 arch/powerpc/platforms/85xx/sgy_cts1000.c | 39 +++++++++++++++--------
 1 file changed, 25 insertions(+), 14 deletions(-)

Comments

Christophe JAILLET June 17, 2022, 5:37 a.m. UTC | #1 
Le 17/06/2022 à 07:22, Liang He a écrit :
> In gpio_halt_probe(), of_find_matching_node() will return a node
> pointer with refcount incremented. We should use of_node_put() in
> fail path or when it is not used anymore.
> 
> Signed-off-by: Liang He <windhl@126.com>
> ---
>   arch/powerpc/platforms/85xx/sgy_cts1000.c | 39 +++++++++++++++--------
>   1 file changed, 25 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/85xx/sgy_cts1000.c b/arch/powerpc/platforms/85xx/sgy_cts1000.c
> index 98ae64075193..a8690fc552cf 100644
> --- a/arch/powerpc/platforms/85xx/sgy_cts1000.c
> +++ b/arch/powerpc/platforms/85xx/sgy_cts1000.c
> @@ -71,33 +71,39 @@ static int gpio_halt_probe(struct platform_device *pdev)
>   {
>   	enum of_gpio_flags flags;
>   	struct device_node *node = pdev->dev.of_node;
> +	struct device_node *child_node;
>   	int gpio, err, irq;
>   	int trigger;
> +	int ret;
>   
>   	if (!node)
>   		return -ENODEV;
>   
>   	/* If there's no matching child, this isn't really an error */
> -	halt_node = of_find_matching_node(node, child_match);
> -	if (!halt_node)
> +	child_node = of_find_matching_node(node, child_match);
> +	if (!child_node)
>   		return 0;
>   
>   	/* Technically we could just read the first one, but punish
>   	 * DT writers for invalid form. */
> -	if (of_gpio_count(halt_node) != 1)
> -		return -EINVAL;
> +	if (of_gpio_count(child_node) != 1) {
> +		ret = -EINVAL;
> +		goto err_put;
> +	}
>   
>   	/* Get the gpio number relative to the dynamic base. */
> -	gpio = of_get_gpio_flags(halt_node, 0, &flags);
> -	if (!gpio_is_valid(gpio))
> -		return -EINVAL;
> +	gpio = of_get_gpio_flags(child_node, 0, &flags);
> +	if (!gpio_is_valid(gpio)) {
> +		ret = -EINVAL;
> +		gotot err_put;
> +	}
>   
>   	err = gpio_request(gpio, "gpio-halt");
>   	if (err) {
>   		printk(KERN_ERR "gpio-halt: error requesting GPIO %d.\n",
>   		       gpio);
> -		halt_node = NULL;
> -		return err;
> +		ret = err;

Sorry for not seeing and asking before, but why do you need 'ret'?
Can't you use the existing 'err' in place in this whole patch?

> +		goto err_put;
>   	}
>   
>   	trigger = (flags == OF_GPIO_ACTIVE_LOW);
> @@ -105,15 +111,15 @@ static int gpio_halt_probe(struct platform_device *pdev)
>   	gpio_direction_output(gpio, !trigger);
>   
>   	/* Now get the IRQ which tells us when the power button is hit */
> -	irq = irq_of_parse_and_map(halt_node, 0);
> +	irq = irq_of_parse_and_map(child_node, 0);
>   	err = request_irq(irq, gpio_halt_irq, IRQF_TRIGGER_RISING |
> -			  IRQF_TRIGGER_FALLING, "gpio-halt", halt_node);
> +			  IRQF_TRIGGER_FALLING, "gpio-halt", child_node);
>   	if (err) {
>   		printk(KERN_ERR "gpio-halt: error requesting IRQ %d for "
>   		       "GPIO %d.\n", irq, gpio);
>   		gpio_free(gpio);
> -		halt_node = NULL;
> -		return err;
> +		ret = err;
> +		goto err_put;
>   	}
>   
>   	/* Register our halt function */
> @@ -122,8 +128,12 @@ static int gpio_halt_probe(struct platform_device *pdev)
>   
>   	printk(KERN_INFO "gpio-halt: registered GPIO %d (%d trigger, %d"
>   	       " irq).\n", gpio, trigger, irq);
> +	ret = 0;
> +	halt_node = of_node_get(child_node);

LGTM, but my preferred style would be:
	halt_node = child_node;
	return 0;

I'm not a maintainer, so this is just my opinion and it is mostly a 
mater of taste.

CJ

>   
> -	return 0;
> +err_put:
> +	of_node_put(child_node);
> +	return ret;
>   }
>   
>   static int gpio_halt_remove(struct platform_device *pdev)
> @@ -139,6 +149,7 @@ static int gpio_halt_remove(struct platform_device *pdev)
>   
>   		gpio_free(gpio);
>   
> +		of_node_put(halt_node);
>   		halt_node = NULL;
>   	}
>
Liang He June 17, 2022, 5:50 a.m. UTC | #2 
At 2022-06-17 13:37:12, "Christophe JAILLET" <christophe.jaillet@wanadoo.fr> wrote:
>Le 17/06/2022 à 07:22, Liang He a écrit :
>> In gpio_halt_probe(), of_find_matching_node() will return a node
>> pointer with refcount incremented. We should use of_node_put() in
>> fail path or when it is not used anymore.
>> 
>> Signed-off-by: Liang He <windhl@126.com>
>> ---
>>   arch/powerpc/platforms/85xx/sgy_cts1000.c | 39 +++++++++++++++--------
>>   1 file changed, 25 insertions(+), 14 deletions(-)
>> 
>> diff --git a/arch/powerpc/platforms/85xx/sgy_cts1000.c b/arch/powerpc/platforms/85xx/sgy_cts1000.c
>> index 98ae64075193..a8690fc552cf 100644
>> --- a/arch/powerpc/platforms/85xx/sgy_cts1000.c
>> +++ b/arch/powerpc/platforms/85xx/sgy_cts1000.c
>> @@ -71,33 +71,39 @@ static int gpio_halt_probe(struct platform_device *pdev)
>>   {
>>   	enum of_gpio_flags flags;
>>   	struct device_node *node = pdev->dev.of_node;
>> +	struct device_node *child_node;
>>   	int gpio, err, irq;
>>   	int trigger;
>> +	int ret;
>>   
>>   	if (!node)
>>   		return -ENODEV;
>>   
>>   	/* If there's no matching child, this isn't really an error */
>> -	halt_node = of_find_matching_node(node, child_match);
>> -	if (!halt_node)
>> +	child_node = of_find_matching_node(node, child_match);
>> +	if (!child_node)
>>   		return 0;
>>   
>>   	/* Technically we could just read the first one, but punish
>>   	 * DT writers for invalid form. */
>> -	if (of_gpio_count(halt_node) != 1)
>> -		return -EINVAL;
>> +	if (of_gpio_count(child_node) != 1) {
>> +		ret = -EINVAL;
>> +		goto err_put;
>> +	}
>>   
>>   	/* Get the gpio number relative to the dynamic base. */
>> -	gpio = of_get_gpio_flags(halt_node, 0, &flags);
>> -	if (!gpio_is_valid(gpio))
>> -		return -EINVAL;
>> +	gpio = of_get_gpio_flags(child_node, 0, &flags);
>> +	if (!gpio_is_valid(gpio)) {
>> +		ret = -EINVAL;
>> +		gotot err_put;
>> +	}
>>   
>>   	err = gpio_request(gpio, "gpio-halt");
>>   	if (err) {
>>   		printk(KERN_ERR "gpio-halt: error requesting GPIO %d.\n",
>>   		       gpio);
>> -		halt_node = NULL;
>> -		return err;
>> +		ret = err;
>
>Sorry for not seeing and asking before, but why do you need 'ret'?
>Can't you use the existing 'err' in place in this whole patch?
>

Thanks, CJ.

Your advice is good and I have not noticed the 'err'.

>> +		goto err_put;
>>   	}
>>   
>>   	trigger = (flags == OF_GPIO_ACTIVE_LOW);
>> @@ -105,15 +111,15 @@ static int gpio_halt_probe(struct platform_device *pdev)
>>   	gpio_direction_output(gpio, !trigger);
>>   
>>   	/* Now get the IRQ which tells us when the power button is hit */
>> -	irq = irq_of_parse_and_map(halt_node, 0);
>> +	irq = irq_of_parse_and_map(child_node, 0);
>>   	err = request_irq(irq, gpio_halt_irq, IRQF_TRIGGER_RISING |
>> -			  IRQF_TRIGGER_FALLING, "gpio-halt", halt_node);
>> +			  IRQF_TRIGGER_FALLING, "gpio-halt", child_node);
>>   	if (err) {
>>   		printk(KERN_ERR "gpio-halt: error requesting IRQ %d for "
>>   		       "GPIO %d.\n", irq, gpio);
>>   		gpio_free(gpio);
>> -		halt_node = NULL;
>> -		return err;
>> +		ret = err;
>> +		goto err_put;
>>   	}
>>   
>>   	/* Register our halt function */
>> @@ -122,8 +128,12 @@ static int gpio_halt_probe(struct platform_device *pdev)
>>   
>>   	printk(KERN_INFO "gpio-halt: registered GPIO %d (%d trigger, %d"
>>   	       " irq).\n", gpio, trigger, irq);
>> +	ret = 0;
>> +	halt_node = of_node_get(child_node);
>
>LGTM, but my preferred style would be:
>	halt_node = child_node;
>	return 0;
>I'm not a maintainer, so this is just my opinion and it is mostly a 
>mater of taste.
>
>CJ

Thanks, CJ.

Now, I also prefer this style and I will use it.

>
>>   
>> -	return 0;
>> +err_put:
>> +	of_node_put(child_node);
>> +	return ret;
>>   }
>>   
>>   static int gpio_halt_remove(struct platform_device *pdev)
>> @@ -139,6 +149,7 @@ static int gpio_halt_remove(struct platform_device *pdev)
>>   
>>   		gpio_free(gpio);
>>   
>> +		of_node_put(halt_node);
>>   		halt_node = NULL;
>>   	}
>>
diff mbox series

Patch

diff --git a/arch/powerpc/platforms/85xx/sgy_cts1000.c b/arch/powerpc/platforms/85xx/sgy_cts1000.c
index 98ae64075193..a8690fc552cf 100644
--- a/arch/powerpc/platforms/85xx/sgy_cts1000.c
+++ b/arch/powerpc/platforms/85xx/sgy_cts1000.c
@@ -71,33 +71,39 @@  static int gpio_halt_probe(struct platform_device *pdev)
 {
 	enum of_gpio_flags flags;
 	struct device_node *node = pdev->dev.of_node;
+	struct device_node *child_node;
 	int gpio, err, irq;
 	int trigger;
+	int ret;
 
 	if (!node)
 		return -ENODEV;
 
 	/* If there's no matching child, this isn't really an error */
-	halt_node = of_find_matching_node(node, child_match);
-	if (!halt_node)
+	child_node = of_find_matching_node(node, child_match);
+	if (!child_node)
 		return 0;
 
 	/* Technically we could just read the first one, but punish
 	 * DT writers for invalid form. */
-	if (of_gpio_count(halt_node) != 1)
-		return -EINVAL;
+	if (of_gpio_count(child_node) != 1) {
+		ret = -EINVAL;
+		goto err_put;
+	}
 
 	/* Get the gpio number relative to the dynamic base. */
-	gpio = of_get_gpio_flags(halt_node, 0, &flags);
-	if (!gpio_is_valid(gpio))
-		return -EINVAL;
+	gpio = of_get_gpio_flags(child_node, 0, &flags);
+	if (!gpio_is_valid(gpio)) {
+		ret = -EINVAL;
+		gotot err_put;
+	}
 
 	err = gpio_request(gpio, "gpio-halt");
 	if (err) {
 		printk(KERN_ERR "gpio-halt: error requesting GPIO %d.\n",
 		       gpio);
-		halt_node = NULL;
-		return err;
+		ret = err;
+		goto err_put;
 	}
 
 	trigger = (flags == OF_GPIO_ACTIVE_LOW);
@@ -105,15 +111,15 @@  static int gpio_halt_probe(struct platform_device *pdev)
 	gpio_direction_output(gpio, !trigger);
 
 	/* Now get the IRQ which tells us when the power button is hit */
-	irq = irq_of_parse_and_map(halt_node, 0);
+	irq = irq_of_parse_and_map(child_node, 0);
 	err = request_irq(irq, gpio_halt_irq, IRQF_TRIGGER_RISING |
-			  IRQF_TRIGGER_FALLING, "gpio-halt", halt_node);
+			  IRQF_TRIGGER_FALLING, "gpio-halt", child_node);
 	if (err) {
 		printk(KERN_ERR "gpio-halt: error requesting IRQ %d for "
 		       "GPIO %d.\n", irq, gpio);
 		gpio_free(gpio);
-		halt_node = NULL;
-		return err;
+		ret = err;
+		goto err_put;
 	}
 
 	/* Register our halt function */
@@ -122,8 +128,12 @@  static int gpio_halt_probe(struct platform_device *pdev)
 
 	printk(KERN_INFO "gpio-halt: registered GPIO %d (%d trigger, %d"
 	       " irq).\n", gpio, trigger, irq);
+	ret = 0;
+	halt_node = of_node_get(child_node);
 
-	return 0;
+err_put:
+	of_node_put(child_node);
+	return ret;
 }
 
 static int gpio_halt_remove(struct platform_device *pdev)
@@ -139,6 +149,7 @@  static int gpio_halt_remove(struct platform_device *pdev)
 
 		gpio_free(gpio);
 
+		of_node_put(halt_node);
 		halt_node = NULL;
 	}