[PATCH] regulator: tps65219: Fix pointer assignment in tps65219_get_rdev_by_name()

[PATCH] regulator: tps65219: Fix pointer assignment in tps65219_get_rdev_by_name()

[cy_huang]

From: ChiYuan Huang <cy_huang@richtek.com>

For the pointer assignment in function body, double pointer must be used as
the input parameter.

Fixes: c12ac5fc3e0a ("regulator: drivers: Add TI TPS65219 PMIC regulators support")
Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
---
Hi,

I try to fix W=1 build warning for tps65219-regulator.

W=1
    warning: parameter ‘dev’ set but not used [-Wunused-but-set-parameter]
    struct regulator_dev *dev)
                         ^~~~~
But the issue is not what the warning message described.

In tps65219_get_rdev_by_name(), it must return the found rdev and assign it
in 'dev' pointer. Due to pointer assignment issue, it doesn't.

The original code may not cause any problem. But it always takes the last
registered regulator rdev for all tps65219 regulator interrupts.
---
 drivers/regulator/tps65219-regulator.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/tps65219-regulator.c b/drivers/regulator/tps65219-regulator.c
index b1719ee990ab..8971b507a79a 100644
--- a/drivers/regulator/tps65219-regulator.c
+++ b/drivers/regulator/tps65219-regulator.c
@@ -289,13 +289,13 @@ static irqreturn_t tps65219_regulator_irq_handler(int irq, void *data)
 
 static int tps65219_get_rdev_by_name(const char *regulator_name,
 				     struct regulator_dev *rdevtbl[7],
-				     struct regulator_dev *dev)
+				     struct regulator_dev **dev)
 {
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
 		if (strcmp(regulator_name, regulators[i].name) == 0) {
-			dev = rdevtbl[i];
+			*dev = rdevtbl[i];
 			return 0;
 		}
 	}
@@ -348,7 +348,7 @@ static int tps65219_regulator_probe(struct platform_device *pdev)
 		irq_data[i].dev = tps->dev;
 		irq_data[i].type = irq_type;
 
-		tps65219_get_rdev_by_name(irq_type->regulator_name, rdevtbl, rdev);
+		tps65219_get_rdev_by_name(irq_type->regulator_name, rdevtbl, &rdev);
 		if (IS_ERR(rdev)) {
 			dev_err(tps->dev, "Failed to get rdev for %s\n",
 				irq_type->regulator_name);
-- 
2.40.1

Re: [PATCH] regulator: tps65219: Fix pointer assignment in tps65219_get_rdev_by_name()

[ChiYuan Huang]

On Fri, Jun 16, 2023 at 10:59:24AM +0800, cy_huang@richtek.com wrote:
> From: ChiYuan Huang <cy_huang@richtek.com>
> 
> For the pointer assignment in function body, double pointer must be used as
> the input parameter.
> 
> Fixes: c12ac5fc3e0a ("regulator: drivers: Add TI TPS65219 PMIC regulators support")
> Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>

Please ignore it. Krzysztof's patch already fix it and applied.
https://lore.kernel.org/lkml/20230507144656.192800-1-krzysztof.kozlowski@linaro.org/
> ---
> Hi,
> 
> I try to fix W=1 build warning for tps65219-regulator.
> 
> W=1
>     warning: parameter ‘dev’ set but not used [-Wunused-but-set-parameter]
>     struct regulator_dev *dev)
>                          ^~~~~
> But the issue is not what the warning message described.
> 
> In tps65219_get_rdev_by_name(), it must return the found rdev and assign it
> in 'dev' pointer. Due to pointer assignment issue, it doesn't.
> 
> The original code may not cause any problem. But it always takes the last
> registered regulator rdev for all tps65219 regulator interrupts.
> ---
>  drivers/regulator/tps65219-regulator.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/regulator/tps65219-regulator.c b/drivers/regulator/tps65219-regulator.c
> index b1719ee990ab..8971b507a79a 100644
> --- a/drivers/regulator/tps65219-regulator.c
> +++ b/drivers/regulator/tps65219-regulator.c
> @@ -289,13 +289,13 @@ static irqreturn_t tps65219_regulator_irq_handler(int irq, void *data)
>  
>  static int tps65219_get_rdev_by_name(const char *regulator_name,
>  				     struct regulator_dev *rdevtbl[7],
> -				     struct regulator_dev *dev)
> +				     struct regulator_dev **dev)
>  {
>  	int i;
>  
>  	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
>  		if (strcmp(regulator_name, regulators[i].name) == 0) {
> -			dev = rdevtbl[i];
> +			*dev = rdevtbl[i];
>  			return 0;
>  		}
>  	}
> @@ -348,7 +348,7 @@ static int tps65219_regulator_probe(struct platform_device *pdev)
>  		irq_data[i].dev = tps->dev;
>  		irq_data[i].type = irq_type;
>  
> -		tps65219_get_rdev_by_name(irq_type->regulator_name, rdevtbl, rdev);
> +		tps65219_get_rdev_by_name(irq_type->regulator_name, rdevtbl, &rdev);
>  		if (IS_ERR(rdev)) {
>  			dev_err(tps->dev, "Failed to get rdev for %s\n",
>  				irq_type->regulator_name);
> -- 
> 2.40.1
>