diff mbox series

[3/9] memory: samsung: exynos5422-dmc: use scoped device node handling to simplify error paths

Message ID 20240812-cleanup-h-of-node-put-memory-v1-3-5065a8f361d2@linaro.org (mailing list archive)
State New
Headers show
Series memory: simplify with scoped/cleanup.h for device nodes | expand

Commit Message

Krzysztof Kozlowski Aug. 12, 2024, 1:33 p.m. UTC
Obtain the device node reference with scoped/cleanup.h to reduce error
handling and make the code a bit simpler.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
 drivers/memory/samsung/exynos5422-dmc.c | 31 +++++++++++--------------------
 1 file changed, 11 insertions(+), 20 deletions(-)

Comments

Jonathan Cameron Aug. 14, 2024, 4:42 p.m. UTC | #1
On Mon, 12 Aug 2024 15:33:57 +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.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Trivial comments inline
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

> ---
>  drivers/memory/samsung/exynos5422-dmc.c | 31 +++++++++++--------------------
>  1 file changed, 11 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
> index da7ecd921c72..d3ae4d95a3ba 100644
> --- a/drivers/memory/samsung/exynos5422-dmc.c
> +++ b/drivers/memory/samsung/exynos5422-dmc.c
> @@ -4,6 +4,7 @@
>   * Author: Lukasz Luba <l.luba@partner.samsung.com>
>   */
>  
> +#include <linux/cleanup.h>
>  #include <linux/clk.h>
>  #include <linux/devfreq.h>
>  #include <linux/devfreq-event.h>
> @@ -1176,10 +1177,10 @@ static int of_get_dram_timings(struct exynos5_dmc *dmc)
>  {
>  	int ret = 0;
>  	int idx;
> -	struct device_node *np_ddr;

This would definitely benefit from a
struct device *dev = dmc->dev;

>  	u32 freq_mhz, clk_period_ps;
>  
> -	np_ddr = of_parse_phandle(dmc->dev->of_node, "device-handle", 0);
> +	struct device_node *np_ddr __free(device_node) = of_parse_phandle(dmc->dev->of_node,
> +									  "device-handle", 0);
Trivial. Maybe consider the wrap suggested in patch 1.
> +	struct device_node *np_ddr __free(device_node) =
		of_parse_phandle(dmc->dev->of_node, "device-handle", 0);

>  	if (!np_ddr) {
>  		dev_warn(dmc->dev, "could not find 'device-handle' in DT\n");
>  		return -EINVAL;
> @@ -1187,39 +1188,31 @@ static int of_get_dram_timings(struct exynos5_dmc *dmc)
>  
>  	dmc->timing_row = devm_kmalloc_array(dmc->dev, TIMING_COUNT,
>  					     sizeof(u32), GFP_KERNEL);
> -	if (!dmc->timing_row) {
> -		ret = -ENOMEM;
> -		goto put_node;
> -	}
> +	if (!dmc->timing_row)
> +		return -ENOMEM;
>  
>  	dmc->timing_data = devm_kmalloc_array(dmc->dev, TIMING_COUNT,
>  					      sizeof(u32), GFP_KERNEL);
> -	if (!dmc->timing_data) {
> -		ret = -ENOMEM;
> -		goto put_node;
> -	}
> +	if (!dmc->timing_data)
> +		return -ENOMEM;
>  
>  	dmc->timing_power = devm_kmalloc_array(dmc->dev, TIMING_COUNT,
>  					       sizeof(u32), GFP_KERNEL);
> -	if (!dmc->timing_power) {
> -		ret = -ENOMEM;
> -		goto put_node;
> -	}
> +	if (!dmc->timing_power)
> +		return -ENOMEM;
>  
>  	dmc->timings = of_lpddr3_get_ddr_timings(np_ddr, dmc->dev,
>  						 DDR_TYPE_LPDDR3,
>  						 &dmc->timings_arr_size);
>  	if (!dmc->timings) {
>  		dev_warn(dmc->dev, "could not get timings from DT\n");
> -		ret = -EINVAL;
> -		goto put_node;
> +		return -EINVAL;
>  	}
>  
>  	dmc->min_tck = of_lpddr3_get_min_tck(np_ddr, dmc->dev);
>  	if (!dmc->min_tck) {
>  		dev_warn(dmc->dev, "could not get tck from DT\n");
> -		ret = -EINVAL;
> -		goto put_node;
> +		return -EINVAL;
>  	}
>  
>  	/* Sorted array of OPPs with frequency ascending */
> @@ -1239,8 +1232,6 @@ static int of_get_dram_timings(struct exynos5_dmc *dmc)
>  	dmc->bypass_timing_data = dmc->timing_data[idx - 1];
>  	dmc->bypass_timing_power = dmc->timing_power[idx - 1];
>  
> -put_node:
> -	of_node_put(np_ddr);
>  	return ret;
>  }
>  
>
Krzysztof Kozlowski Aug. 14, 2024, 5:57 p.m. UTC | #2
On 14/08/2024 18:42, Jonathan Cameron wrote:
> On Mon, 12 Aug 2024 15:33:57 +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.
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> Trivial comments inline
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> 
>> ---
>>  drivers/memory/samsung/exynos5422-dmc.c | 31 +++++++++++--------------------
>>  1 file changed, 11 insertions(+), 20 deletions(-)
>>
>> diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
>> index da7ecd921c72..d3ae4d95a3ba 100644
>> --- a/drivers/memory/samsung/exynos5422-dmc.c
>> +++ b/drivers/memory/samsung/exynos5422-dmc.c
>> @@ -4,6 +4,7 @@
>>   * Author: Lukasz Luba <l.luba@partner.samsung.com>
>>   */
>>  
>> +#include <linux/cleanup.h>
>>  #include <linux/clk.h>
>>  #include <linux/devfreq.h>
>>  #include <linux/devfreq-event.h>
>> @@ -1176,10 +1177,10 @@ static int of_get_dram_timings(struct exynos5_dmc *dmc)
>>  {
>>  	int ret = 0;
>>  	int idx;
>> -	struct device_node *np_ddr;
> 
> This would definitely benefit from a
> struct device *dev = dmc->dev;

True, I'll do it in separate patch.

> 
>>  	u32 freq_mhz, clk_period_ps;
>>  
>> -	np_ddr = of_parse_phandle(dmc->dev->of_node, "device-handle", 0);
>> +	struct device_node *np_ddr __free(device_node) = of_parse_phandle(dmc->dev->of_node,
>> +									  "device-handle", 0);
> Trivial. Maybe consider the wrap suggested in patch 1.
>> +	struct device_node *np_ddr __free(device_node) =
> 		of_parse_phandle(dmc->dev->of_node, "device-handle", 0);

Ack.



Best regards,
Krzysztof
diff mbox series

Patch

diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
index da7ecd921c72..d3ae4d95a3ba 100644
--- a/drivers/memory/samsung/exynos5422-dmc.c
+++ b/drivers/memory/samsung/exynos5422-dmc.c
@@ -4,6 +4,7 @@ 
  * Author: Lukasz Luba <l.luba@partner.samsung.com>
  */
 
+#include <linux/cleanup.h>
 #include <linux/clk.h>
 #include <linux/devfreq.h>
 #include <linux/devfreq-event.h>
@@ -1176,10 +1177,10 @@  static int of_get_dram_timings(struct exynos5_dmc *dmc)
 {
 	int ret = 0;
 	int idx;
-	struct device_node *np_ddr;
 	u32 freq_mhz, clk_period_ps;
 
-	np_ddr = of_parse_phandle(dmc->dev->of_node, "device-handle", 0);
+	struct device_node *np_ddr __free(device_node) = of_parse_phandle(dmc->dev->of_node,
+									  "device-handle", 0);
 	if (!np_ddr) {
 		dev_warn(dmc->dev, "could not find 'device-handle' in DT\n");
 		return -EINVAL;
@@ -1187,39 +1188,31 @@  static int of_get_dram_timings(struct exynos5_dmc *dmc)
 
 	dmc->timing_row = devm_kmalloc_array(dmc->dev, TIMING_COUNT,
 					     sizeof(u32), GFP_KERNEL);
-	if (!dmc->timing_row) {
-		ret = -ENOMEM;
-		goto put_node;
-	}
+	if (!dmc->timing_row)
+		return -ENOMEM;
 
 	dmc->timing_data = devm_kmalloc_array(dmc->dev, TIMING_COUNT,
 					      sizeof(u32), GFP_KERNEL);
-	if (!dmc->timing_data) {
-		ret = -ENOMEM;
-		goto put_node;
-	}
+	if (!dmc->timing_data)
+		return -ENOMEM;
 
 	dmc->timing_power = devm_kmalloc_array(dmc->dev, TIMING_COUNT,
 					       sizeof(u32), GFP_KERNEL);
-	if (!dmc->timing_power) {
-		ret = -ENOMEM;
-		goto put_node;
-	}
+	if (!dmc->timing_power)
+		return -ENOMEM;
 
 	dmc->timings = of_lpddr3_get_ddr_timings(np_ddr, dmc->dev,
 						 DDR_TYPE_LPDDR3,
 						 &dmc->timings_arr_size);
 	if (!dmc->timings) {
 		dev_warn(dmc->dev, "could not get timings from DT\n");
-		ret = -EINVAL;
-		goto put_node;
+		return -EINVAL;
 	}
 
 	dmc->min_tck = of_lpddr3_get_min_tck(np_ddr, dmc->dev);
 	if (!dmc->min_tck) {
 		dev_warn(dmc->dev, "could not get tck from DT\n");
-		ret = -EINVAL;
-		goto put_node;
+		return -EINVAL;
 	}
 
 	/* Sorted array of OPPs with frequency ascending */
@@ -1239,8 +1232,6 @@  static int of_get_dram_timings(struct exynos5_dmc *dmc)
 	dmc->bypass_timing_data = dmc->timing_data[idx - 1];
 	dmc->bypass_timing_power = dmc->timing_power[idx - 1];
 
-put_node:
-	of_node_put(np_ddr);
 	return ret;
 }