linux-kernel - Re: [PATCH] staging: iio: adt7316: drop unnecessary initialization of variables

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Date:   Sun, 16 Dec 2018 12:05:37 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Hardik Singh Rathore <hardiksingh.k@...il.com>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: iio: adt7316: drop unnecessary initialization
 of variables

On Wed, 12 Dec 2018 22:17:46 +0530
Hardik Singh Rathore <hardiksingh.k@...il.com> wrote:

> Initialization is unnecessary when the variable is written before it is
> read. There were some occasions in which the driver would initialize `ret'
> during declaration without need.
> 
> Purely a cosmetic change with no functional impact.
> 
> Signed-off-by: Hardik Singh Rathore <hardiksingh.k@...il.com>
There is a lot of churn in this driver at the moment (this is one or
3 patch sets I'm reviewing for it today), but this seems to still be
relevant so I dealt with manually applying it.

Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

Thanks,

Jonathan

> ---
>  drivers/staging/iio/addac/adt7316-i2c.c | 6 +++---
>  drivers/staging/iio/addac/adt7316-spi.c | 4 ++--
>  drivers/staging/iio/addac/adt7316.c     | 2 +-
>  3 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/iio/addac/adt7316-i2c.c b/drivers/staging/iio/addac/adt7316-i2c.c
> index 473e5e34ec00..48736c0ab0ef 100644
> --- a/drivers/staging/iio/addac/adt7316-i2c.c
> +++ b/drivers/staging/iio/addac/adt7316-i2c.c
> @@ -47,7 +47,7 @@ static int adt7316_i2c_read(void *client, u8 reg, u8 *data)
>  static int adt7316_i2c_write(void *client, u8 reg, u8 data)
>  {
>  	struct i2c_client *cl = client;
> -	int ret = 0;
> +	int ret;
>  
>  	ret = i2c_smbus_write_byte_data(cl, reg, data);
>  	if (ret < 0)
> @@ -59,7 +59,7 @@ static int adt7316_i2c_write(void *client, u8 reg, u8 data)
>  static int adt7316_i2c_multi_read(void *client, u8 reg, u8 count, u8 *data)
>  {
>  	struct i2c_client *cl = client;
> -	int i, ret = 0;
> +	int i, ret;
>  
>  	if (count > ADT7316_REG_MAX_ADDR)
>  		count = ADT7316_REG_MAX_ADDR;
> @@ -78,7 +78,7 @@ static int adt7316_i2c_multi_read(void *client, u8 reg, u8 count, u8 *data)
>  static int adt7316_i2c_multi_write(void *client, u8 reg, u8 count, u8 *data)
>  {
>  	struct i2c_client *cl = client;
> -	int i, ret = 0;
> +	int i, ret;
>  
>  	if (count > ADT7316_REG_MAX_ADDR)
>  		count = ADT7316_REG_MAX_ADDR;
> diff --git a/drivers/staging/iio/addac/adt7316-spi.c b/drivers/staging/iio/addac/adt7316-spi.c
> index 5cd22743e140..f524b4ccf5c7 100644
> --- a/drivers/staging/iio/addac/adt7316-spi.c
> +++ b/drivers/staging/iio/addac/adt7316-spi.c
> @@ -27,7 +27,7 @@ static int adt7316_spi_multi_read(void *client, u8 reg, u8 count, u8 *data)
>  {
>  	struct spi_device *spi_dev = client;
>  	u8 cmd[2];
> -	int ret = 0;
> +	int ret;
>  
>  	if (count > ADT7316_REG_MAX_ADDR)
>  		count = ADT7316_REG_MAX_ADDR;
> @@ -56,7 +56,7 @@ static int adt7316_spi_multi_write(void *client, u8 reg, u8 count, u8 *data)
>  {
>  	struct spi_device *spi_dev = client;
>  	u8 buf[ADT7316_REG_MAX_ADDR + 2];
> -	int i, ret = 0;
> +	int i, ret;
>  
>  	if (count > ADT7316_REG_MAX_ADDR)
>  		count = ADT7316_REG_MAX_ADDR;
> diff --git a/drivers/staging/iio/addac/adt7316.c b/drivers/staging/iio/addac/adt7316.c
> index 2f8a122f475d..2d1e707a8676 100644
> --- a/drivers/staging/iio/addac/adt7316.c
> +++ b/drivers/staging/iio/addac/adt7316.c
> @@ -2104,7 +2104,7 @@ int adt7316_probe(struct device *dev, struct adt7316_bus *bus,
>  	struct adt7316_chip_info *chip;
>  	struct iio_dev *indio_dev;
>  	unsigned short *adt7316_platform_data = dev->platform_data;
> -	int ret = 0;
> +	int ret;
>  
>  	indio_dev = devm_iio_device_alloc(dev, sizeof(*chip));
>  	if (!indio_dev)