linux-kernel - Re: [PATCH] regulator: tps65219: Fix pointer assignment in tps65219_get_rdev_by

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Message-ID: <20230616042217.GA3996@linuxcarl2.richtek.com>
Date:   Fri, 16 Jun 2023 12:22:17 +0800
From:   ChiYuan Huang <cy_huang@...htek.com>
To:     <broonie@...nel.org>
CC:     <tony@...mide.com>, <lgirdwood@...il.com>, <jneanne@...libre.com>,
        <linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] regulator: tps65219: Fix pointer assignment in
 tps65219_get_rdev_by_name()

On Fri, Jun 16, 2023 at 10:59:24AM +0800, cy_huang@...htek.com wrote:
> From: ChiYuan Huang <cy_huang@...htek.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@...htek.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
>