linux-kernel - Re: [RESEND PATCH] regulator: tps65219: Fix matching interrupts for their regulators

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Message-ID: <20230508085341.hggdfw45zqer4e5q@blmsp>
Date:   Mon, 8 May 2023 10:53:41 +0200
From:   Markus Schneider-Pargmann <msp@...libre.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Tony Lindgren <tony@...mide.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jerome Neanne <jneanne@...libre.com>,
        linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, khilman@...libre.com, j-keerthy@...com
Subject: Re: [RESEND PATCH] regulator: tps65219: Fix matching interrupts for
 their regulators

Hi,

On Sun, May 07, 2023 at 04:46:56PM +0200, Krzysztof Kozlowski wrote:
> The driver's probe() first registers regulators in a loop and then in a
> second loop passes them as irq data to the interrupt handlers.  However
> the function to get the regulator for given name
> tps65219_get_rdev_by_name() was a no-op due to argument passed by value,
> not pointer, thus the second loop assigned always same value - from
> previous loop.  The interrupts, when fired, where executed with wrong
> data.  Compiler also noticed it:
> 
>   drivers/regulator/tps65219-regulator.c: In function ‘tps65219_get_rdev_by_name’:
>   drivers/regulator/tps65219-regulator.c:292:60: error: parameter ‘dev’ set but not used [-Werror=unused-but-set-parameter]
> 
> Fixes: c12ac5fc3e0a ("regulator: drivers: Add TI TPS65219 PMIC regulators support")
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Reviewed-by: Markus Schneider-Pargmann <msp@...libre.com>

Best,
Markus

> 
> ---
> 
> Not tested.
> Sent two months ago and no comments, so resending.
> 
> Cc: Jerome Neanne <jneanne@...libre.com>
> Cc: khilman@...libre.com
> Cc: msp@...libre.com
> Cc: j-keerthy@...com
> ---
>  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);
> -- 
> 2.34.1
>