diff mbox series

[v3,2/6] thermal: of: Use scoped device node handling to simplify thermal_of_trips_init()

Message ID 20241008-b4-cleanup-h-of-node-put-thermal-v3-2-825122398f71@linaro.org
State New
Headers show
Series thermal: scope/cleanup.h improvements | expand

Commit Message

Krzysztof Kozlowski Oct. 8, 2024, 9 a.m. UTC 
Obtain the device node reference with scoped/cleanup.h to reduce error
handling and make the code a bit simpler.

Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

---

Changes in v2:
1. Drop left-over of_node_put in regular exit path (Chen-Yu)
---
 drivers/thermal/thermal_of.c | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

Comments

Jonathan Cameron Oct. 8, 2024, 11:32 a.m. UTC | #1 
On Tue, 08 Oct 2024 11:00:02 +0200
Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> wrote:

> Obtain the device node reference with scoped/cleanup.h to reduce error
> handling and make the code a bit simpler.
> 
> Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
A follow up suggestion below.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

> 
> ---
> 
> Changes in v2:
> 1. Drop left-over of_node_put in regular exit path (Chen-Yu)
> ---
>  drivers/thermal/thermal_of.c | 16 ++++------------
>  1 file changed, 4 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
> index f0ffc0e335ba9406f4fd858d6c561f9d23f4b842..d7d6f62caa13d545e5f7fae4c8ac1e737bf4c4b1 100644
> --- a/drivers/thermal/thermal_of.c
> +++ b/drivers/thermal/thermal_of.c
> @@ -96,10 +96,9 @@ static int thermal_of_populate_trip(struct device_node *np,
>  static struct thermal_trip *thermal_of_trips_init(struct device_node *np, int *ntrips)
>  {
>  	struct thermal_trip *tt;
> -	struct device_node *trips;
>  	int ret, count;
>  
> -	trips = of_get_child_by_name(np, "trips");
> +	struct device_node *trips __free(device_node) = of_get_child_by_name(np, "trips");
>  	if (!trips) {
>  		pr_err("Failed to find 'trips' node\n");
>  		return ERR_PTR(-EINVAL);
> @@ -108,15 +107,12 @@ static struct thermal_trip *thermal_of_trips_init(struct device_node *np, int *n
>  	count = of_get_child_count(trips);
>  	if (!count) {
>  		pr_err("No trip point defined\n");
> -		ret = -EINVAL;
> -		goto out_of_node_put;
> +		return ERR_PTR(-EINVAL);
>  	}
>  
>  	tt = kzalloc(sizeof(*tt) * count, GFP_KERNEL);
> -	if (!tt) {
> -		ret = -ENOMEM;
> -		goto out_of_node_put;
> -	}
> +	if (!tt)
> +		return ERR_PTR(-ENOMEM);
>  
>  	*ntrips = count;
>  
> @@ -127,15 +123,11 @@ static struct thermal_trip *thermal_of_trips_init(struct device_node *np, int *n
>  			goto out_kfree;
>  	}
>  
> -	of_node_put(trips);
> -
>  	return tt;
>  
>  out_kfree:
>  	kfree(tt);
May be worth a follow up to do __free(kfree) on this + a steal for the return.
Then push the ntrips set until after the populate so it doesn't need resetting to 0.


>  	*ntrips = 0;
> -out_of_node_put:
> -	of_node_put(trips);
>  
>  	return ERR_PTR(ret);
>  }
>
Krzysztof Kozlowski Oct. 10, 2024, 5:53 p.m. UTC | #2 
On 08/10/2024 13:32, Jonathan Cameron wrote:
>>  	tt = kzalloc(sizeof(*tt) * count, GFP_KERNEL);
>> -	if (!tt) {
>> -		ret = -ENOMEM;
>> -		goto out_of_node_put;
>> -	}
>> +	if (!tt)
>> +		return ERR_PTR(-ENOMEM);
>>  
>>  	*ntrips = count;
>>  
>> @@ -127,15 +123,11 @@ static struct thermal_trip *thermal_of_trips_init(struct device_node *np, int *n
>>  			goto out_kfree;
>>  	}
>>  
>> -	of_node_put(trips);
>> -
>>  	return tt;
>>  
>>  out_kfree:
>>  	kfree(tt);
> May be worth a follow up to do __free(kfree) on this + a steal for the return.
> Then push the ntrips set until after the populate so it doesn't need resetting to 0.

That's good idea, I'll send v4 with a revised patch (dropping your RB here).

Best regards,
Krzysztof
diff mbox series

Patch

diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index f0ffc0e335ba9406f4fd858d6c561f9d23f4b842..d7d6f62caa13d545e5f7fae4c8ac1e737bf4c4b1 100644
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -96,10 +96,9 @@  static int thermal_of_populate_trip(struct device_node *np,
 static struct thermal_trip *thermal_of_trips_init(struct device_node *np, int *ntrips)
 {
 	struct thermal_trip *tt;
-	struct device_node *trips;
 	int ret, count;
 
-	trips = of_get_child_by_name(np, "trips");
+	struct device_node *trips __free(device_node) = of_get_child_by_name(np, "trips");
 	if (!trips) {
 		pr_err("Failed to find 'trips' node\n");
 		return ERR_PTR(-EINVAL);
@@ -108,15 +107,12 @@  static struct thermal_trip *thermal_of_trips_init(struct device_node *np, int *n
 	count = of_get_child_count(trips);
 	if (!count) {
 		pr_err("No trip point defined\n");
-		ret = -EINVAL;
-		goto out_of_node_put;
+		return ERR_PTR(-EINVAL);
 	}
 
 	tt = kzalloc(sizeof(*tt) * count, GFP_KERNEL);
-	if (!tt) {
-		ret = -ENOMEM;
-		goto out_of_node_put;
-	}
+	if (!tt)
+		return ERR_PTR(-ENOMEM);
 
 	*ntrips = count;
 
@@ -127,15 +123,11 @@  static struct thermal_trip *thermal_of_trips_init(struct device_node *np, int *n
 			goto out_kfree;
 	}
 
-	of_node_put(trips);
-
 	return tt;
 
 out_kfree:
 	kfree(tt);
 	*ntrips = 0;
-out_of_node_put:
-	of_node_put(trips);
 
 	return ERR_PTR(ret);
 }