linux-kernel - Re: [PATCH v3 1/2] drivers/misc: at24: convert to use devm

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Date:	Wed, 29 May 2013 17:19:03 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Nikolay Balandin' <n.a.balandin@...il.com>,
	'Greg Kroah-Hartman' <gregkh@...uxfoundation.org>
Cc:	'Nikolay Balandin' <nbalandin@....rtsoft.ru>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jingoo Han <jg1.han@...sung.com>,
	'Bill Pemberton' <wfp5p@...ginia.edu>,
	'Alexandre Pereira da Silva' <aletes.xgr@...il.com>,
	'Andy Shevchenko' <andy.shevchenko@...il.com>,
	'Wolfram Sang' <wsa@...-dreams.de>
Subject: Re: [PATCH v3 1/2] drivers/misc: at24: convert to use devm_kzalloc

On Wednesday, May 29, 2013 5:00 AM, Nikolay Balandin wrote:
> 
> From: Nikolay Balandin <nbalandin@....rtsoft.ru>
> 
> Use devm_kzalloc to make cleanup paths simpler
> 
> Signed-off-by: Nikolay Balandin <nbalandin@....rtsoft.ru>

It looks good.
Reviewed-by: Jingoo Han <jg1.han@...sung.com>

Best regards,
Jingoo Han


> ---
>  drivers/misc/eeprom/at24.c |   44 +++++++++++++++-----------------------------
>  1 file changed, 15 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
> index 2baeec5..5d4fd69 100644
> --- a/drivers/misc/eeprom/at24.c
> +++ b/drivers/misc/eeprom/at24.c
> @@ -492,10 +492,9 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
>  	if (client->dev.platform_data) {
>  		chip = *(struct at24_platform_data *)client->dev.platform_data;
>  	} else {
> -		if (!id->driver_data) {
> -			err = -ENODEV;
> -			goto err_out;
> -		}
> +		if (!id->driver_data)
> +			return -ENODEV;
> +
>  		magic = id->driver_data;
>  		chip.byte_len = BIT(magic & AT24_BITMASK(AT24_SIZE_BYTELEN));
>  		magic >>= AT24_SIZE_BYTELEN;
> @@ -519,8 +518,7 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
>  			"byte_len looks suspicious (no power of 2)!\n");
>  	if (!chip.page_size) {
>  		dev_err(&client->dev, "page_size must not be 0!\n");
> -		err = -EINVAL;
> -		goto err_out;
> +		return -EINVAL;
>  	}
>  	if (!is_power_of_2(chip.page_size))
>  		dev_warn(&client->dev,
> @@ -528,10 +526,9 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
> 
>  	/* Use I2C operations unless we're stuck with SMBus extensions. */
>  	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
> -		if (chip.flags & AT24_FLAG_ADDR16) {
> -			err = -EPFNOSUPPORT;
> -			goto err_out;
> -		}
> +		if (chip.flags & AT24_FLAG_ADDR16)
> +			return -EPFNOSUPPORT;
> +
>  		if (i2c_check_functionality(client->adapter,
>  				I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
>  			use_smbus = I2C_SMBUS_I2C_BLOCK_DATA;
> @@ -542,8 +539,7 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
>  				I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
>  			use_smbus = I2C_SMBUS_BYTE_DATA;
>  		} else {
> -			err = -EPFNOSUPPORT;
> -			goto err_out;
> +			return -EPFNOSUPPORT;
>  		}
>  	}
> 
> @@ -553,12 +549,10 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
>  		num_addresses =	DIV_ROUND_UP(chip.byte_len,
>  			(chip.flags & AT24_FLAG_ADDR16) ? 65536 : 256);
> 
> -	at24 = kzalloc(sizeof(struct at24_data) +
> +	at24 = devm_kzalloc(&client->dev, sizeof(struct at24_data) +
>  		num_addresses * sizeof(struct i2c_client *), GFP_KERNEL);
> -	if (!at24) {
> -		err = -ENOMEM;
> -		goto err_out;
> -	}
> +	if (!at24)
> +		return -ENOMEM;
> 
>  	mutex_init(&at24->lock);
>  	at24->use_smbus = use_smbus;
> @@ -596,11 +590,10 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
>  			at24->write_max = write_max;
> 
>  			/* buffer (data + address at the beginning) */
> -			at24->writebuf = kmalloc(write_max + 2, GFP_KERNEL);
> -			if (!at24->writebuf) {
> -				err = -ENOMEM;
> -				goto err_struct;
> -			}
> +			at24->writebuf = devm_kzalloc(&client->dev,
> +				write_max + 2, GFP_KERNEL);
> +			if (!at24->writebuf)
> +				return -ENOMEM;
>  		} else {
>  			dev_warn(&client->dev,
>  				"cannot write due to controller restrictions.");
> @@ -648,11 +641,6 @@ err_clients:
>  		if (at24->client[i])
>  			i2c_unregister_device(at24->client[i]);
> 
> -	kfree(at24->writebuf);
> -err_struct:
> -	kfree(at24);
> -err_out:
> -	dev_dbg(&client->dev, "probe error %d\n", err);
>  	return err;
>  }
> 
> @@ -667,8 +655,6 @@ static int at24_remove(struct i2c_client *client)
>  	for (i = 1; i < at24->num_addresses; i++)
>  		i2c_unregister_device(at24->client[i]);
> 
> -	kfree(at24->writebuf);
> -	kfree(at24);
>  	return 0;
>  }
> 
> --
> 1.7.9.5

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