linux-kernel - Re: [PATCH v2] leds: max8997: Don't error if there is no pdata

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Date:   Fri, 21 Oct 2022 15:11:45 +0200
From:   Pavel Machek <pavel@....cz>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH v2] leds: max8997: Don't error if there is no pdata

On Thu 2022-10-20 12:44:42, Paul Cercueil wrote:
> The driver works just fine if no platform data is supplied.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

Does it? Bad Paul, bad Andy.

> +++ b/drivers/leds/leds-max8997.c
> @@ -238,11 +238,6 @@ static int max8997_led_probe(struct platform_device *pdev)
>  	char name[20];
>  	int ret = 0;
>  
> -	if (pdata == NULL) {
> -		dev_err(&pdev->dev, "no platform data\n");
> -		return -ENODEV;
> -	}
> -
>  	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
>  	if (led == NULL)
>  		return -ENOMEM;
> @@ -258,7 +253,7 @@ static int max8997_led_probe(struct platform_device *pdev)
>  	led->iodev = iodev;
>  
>  	/* initialize mode and brightness according to platform_data */
> -	if (pdata->led_pdata) {
> +	if (pdata && pdata->led_pdata) {
>  		u8 mode = 0, brightness = 0;
>  
>  		mode = pdata->led_pdata->mode[led->id];

I see pdata being dereferenced here.
									Pavel
-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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