Subject: [patch v2 2/2] pinctrl: samsung: remove "out of memory" messages

From: [email-masked] (Krzysztof Kozlowski)
Date: Tue, 23 Jun 2015 08:53:04 +0900

On 23.06.2015 00:13, Dan Carpenter wrote:
> Checkpatch.pl complains about these:
> 
> WARNING: Possible unnecessary 'out of memory' message
> 
> The messages use a little extra RAM and they add a few extra lines of
> code.  We're probably never going to hit these out of memory situations
> but if we did then kmalloc() has pretty good error messages built-in.
> 
> Signed-off-by: Dan Carpenter <[email-masked]>

Looks good:
Reviewed-by: Krzysztof Kozlowski <[email-masked]>

Best regards,
Krzysztof

> 
> diff --git a/drivers/pinctrl/samsung/pinctrl-exynos5440.c b/drivers/pinctrl/samsung/pinctrl-exynos5440.c
> index fa84db6..5574b8a 100644
> --- a/drivers/pinctrl/samsung/pinctrl-exynos5440.c
> +++ b/drivers/pinctrl/samsung/pinctrl-exynos5440.c
> @@ -203,10 +203,8 @@ static int exynos5440_dt_node_to_map(struct pinctrl_dev *pctldev,
>  
>  	/* Allocate memory for pin-map entries */
>  	map = kzalloc(sizeof(*map) * map_cnt, GFP_KERNEL);
> -	if (!map) {
> -		dev_err(dev, "could not alloc memory for pin-maps\n");
> +	if (!map)
>  		return -ENOMEM;
> -	}
>  	*nmaps = 0;
>  
>  	/*
> @@ -214,10 +212,8 @@ static int exynos5440_dt_node_to_map(struct pinctrl_dev *pctldev,
>  	 * from the node name from which these map entries are be created.
>  	 */
>  	gname = kasprintf(GFP_KERNEL, "%s%s", np->name, GROUP_SUFFIX);
> -	if (!gname) {
> -		dev_err(dev, "failed to alloc memory for group name\n");
> +	if (!gname)
>  		goto free_map;
> -	}
>  
>  	/*
>  	 * don't have config options? then skip over to creating function
> @@ -228,10 +224,8 @@ static int exynos5440_dt_node_to_map(struct pinctrl_dev *pctldev,
>  
>  	/* Allocate memory for config entries */
>  	cfg = kzalloc(sizeof(*cfg) * cfg_cnt, GFP_KERNEL);
> -	if (!cfg) {
> -		dev_err(dev, "failed to alloc memory for configs\n");
> +	if (!cfg)
>  		goto free_gname;
> -	}
>  
>  	/* Prepare a list of config settings */
>  	for (idx = 0, cfg_cnt = 0; idx < ARRAY_SIZE(pcfgs); idx++) {
> @@ -253,10 +247,8 @@ skip_cfgs:
>  	if (of_find_property(np, "samsung,exynos5440-pin-function", NULL)) {
>  		fname = kasprintf(GFP_KERNEL,
>  				  "%s%s", np->name, FUNCTION_SUFFIX);
> -		if (!fname) {
> -			dev_err(dev, "failed to alloc memory for func name\n");
> +		if (!fname)
>  			goto free_cfg;
> -		}
>  
>  		map[*nmaps].data.mux.group = gname;
>  		map[*nmaps].data.mux.function = fname;
> @@ -647,10 +639,8 @@ static int exynos5440_pinctrl_parse_dt_pins(struct platform_device *pdev,
>  	}
>  
>  	*pin_list = devm_kzalloc(dev, *npins * sizeof(**pin_list), GFP_KERNEL);
> -	if (!*pin_list) {
> -		dev_err(dev, "failed to allocate memory for pin list\n");
> +	if (!*pin_list)
>  		return -ENOMEM;
> -	}
>  
>  	return of_property_read_u32_array(cfg_np, "samsung,exynos5440-pins",
>  			*pin_list, *npins);
> @@ -678,17 +668,15 @@ static int exynos5440_pinctrl_parse_dt(struct platform_device *pdev,
>  		return -EINVAL;
>  
>  	groups = devm_kzalloc(dev, grp_cnt * sizeof(*groups), GFP_KERNEL);
> -	if (!groups) {
> -		dev_err(dev, "failed allocate memory for ping group list\n");
> +	if (!groups)
>  		return -EINVAL;
> -	}
> +
>  	grp = groups;
>  
>  	functions = devm_kzalloc(dev, grp_cnt * sizeof(*functions), GFP_KERNEL);
> -	if (!functions) {
> -		dev_err(dev, "failed to allocate memory for function list\n");
> +	if (!functions)
>  		return -EINVAL;
> -	}
> +
>  	func = functions;
>  
>  	/*
> @@ -708,10 +696,8 @@ static int exynos5440_pinctrl_parse_dt(struct platform_device *pdev,
>  		/* derive pin group name from the node name */
>  		gname = devm_kasprintf(dev, GFP_KERNEL,
>  				       "%s%s", cfg_np->name, GROUP_SUFFIX);
> -		if (!gname) {
> -			dev_err(dev, "failed to alloc memory for group name\n");
> +		if (!gname)
>  			return -ENOMEM;
> -		}
>  
>  		grp->name = gname;
>  		grp->pins = pin_list;
> @@ -727,18 +713,13 @@ skip_to_pin_function:
>  		/* derive function name from the node name */
>  		fname = devm_kasprintf(dev, GFP_KERNEL,
>  				       "%s%s", cfg_np->name, FUNCTION_SUFFIX);
> -		if (!fname) {
> -			dev_err(dev, "failed to alloc memory for func name\n");
> +		if (!fname)
>  			return -ENOMEM;
> -		}
>  
>  		func->name = fname;
>  		func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL);
> -		if (!func->groups) {
> -			dev_err(dev, "failed to alloc memory for group list "
> -					"in pin function");
> +		if (!func->groups)
>  			return -ENOMEM;
> -		}
>  		func->groups[0] = gname;
>  		func->num_groups = gname ? 1 : 0;
>  		func->function = function;
> @@ -766,10 +747,8 @@ static int exynos5440_pinctrl_register(struct platform_device *pdev,
>  	int pin, ret;
>  
>  	ctrldesc = devm_kzalloc(dev, sizeof(*ctrldesc), GFP_KERNEL);
> -	if (!ctrldesc) {
> -		dev_err(dev, "could not allocate memory for pinctrl desc\n");
> +	if (!ctrldesc)
>  		return -ENOMEM;
> -	}
>  
>  	ctrldesc->name = "exynos5440-pinctrl";
>  	ctrldesc->owner = THIS_MODULE;
> @@ -779,10 +758,8 @@ static int exynos5440_pinctrl_register(struct platform_device *pdev,
>  
>  	pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
>  				EXYNOS5440_MAX_PINS, GFP_KERNEL);
> -	if (!pindesc) {
> -		dev_err(&pdev->dev, "mem alloc for pin descriptors failed\n");
> +	if (!pindesc)
>  		return -ENOMEM;
> -	}
>  	ctrldesc->pins = pindesc;
>  	ctrldesc->npins = EXYNOS5440_MAX_PINS;
>  
> @@ -796,10 +773,8 @@ static int exynos5440_pinctrl_register(struct platform_device *pdev,
>  	 */
>  	pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH *
>  					ctrldesc->npins, GFP_KERNEL);
> -	if (!pin_names) {
> -		dev_err(&pdev->dev, "mem alloc for pin names failed\n");
> +	if (!pin_names)
>  		return -ENOMEM;
> -	}
>  
>  	/* for each pin, set the name of the pin */
>  	for (pin = 0; pin < ctrldesc->npins; pin++) {
> @@ -836,10 +811,8 @@ static int exynos5440_gpiolib_register(struct platform_device *pdev,
>  	int ret;
>  
>  	gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
> -	if (!gc) {
> -		dev_err(&pdev->dev, "mem alloc for gpio_chip failed\n");
> +	if (!gc)
>  		return -ENOMEM;
> -	}
>  
>  	priv->gc = gc;
>  	gc->base = 0;
> @@ -941,10 +914,8 @@ static int exynos5440_gpio_irq_init(struct platform_device *pdev,
>  
>  	intd = devm_kzalloc(dev, sizeof(*intd) * EXYNOS5440_MAX_GPIO_INT,
>  					GFP_KERNEL);
> -	if (!intd) {
> -		dev_err(dev, "failed to allocate memory for gpio intr data\n");
> +	if (!intd)
>  		return -ENOMEM;
> -	}
>  
>  	for (i = 0; i < EXYNOS5440_MAX_GPIO_INT; i++) {
>  		irq = irq_of_parse_and_map(dev->of_node, i);
> @@ -987,10 +958,8 @@ static int exynos5440_pinctrl_probe(struct platform_device *pdev)
>  	}
>  
>  	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> -	if (!priv) {
> -		dev_err(dev, "could not allocate memory for private data\n");
> +	if (!priv)
>  		return -ENOMEM;
> -	}
>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	priv->reg_base = devm_ioremap_resource(&pdev->dev, res);
>