linux-kernel - Re: [PATCH 7/7] iio: Adjust checks for null pointers in six functions

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Date:   Sun, 25 Sep 2016 15:24:36 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        linux-iio@...r.kernel.org, Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 7/7] iio: Adjust checks for null pointers in six functions

On 24/09/16 07:31, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sat, 24 Sep 2016 08:00:07 +0200
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
> 
> The script "checkpatch.pl" can point information out like the following.
> 
> Comparison to NULL could be written !…
> 
> Thus fix the affected source code places.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
This is a more worthwhile change in my mind to the jump label changes.
Would you mind resending with it not based on top of those?

Thanks,

Jonathan
> ---
>  drivers/iio/industrialio-buffer.c | 18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
> index 57e201a..6893639 100644
> --- a/drivers/iio/industrialio-buffer.c
> +++ b/drivers/iio/industrialio-buffer.c
> @@ -310,7 +310,7 @@ static int iio_scan_mask_set(struct iio_dev *indio_dev,
>  	trialmask = kmalloc_array(BITS_TO_LONGS(indio_dev->masklength),
>  				  sizeof(*trialmask),
>  				  GFP_KERNEL);
> -	if (trialmask == NULL)
> +	if (!trialmask)
>  		return -ENOMEM;
>  	if (!indio_dev->masklength) {
>  		WARN(1, "Trying to set scanmask prior to registering buffer\n");
> @@ -711,7 +711,7 @@ static int iio_verify_update(struct iio_dev *indio_dev,
>  	/* What scan mask do we actually have? */
>  	compound_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength),
>  				sizeof(long), GFP_KERNEL);
> -	if (compound_mask == NULL)
> +	if (!compound_mask)
>  		return -ENOMEM;
>  
>  	scan_timestamp = false;
> @@ -736,7 +736,7 @@ static int iio_verify_update(struct iio_dev *indio_dev,
>  				    compound_mask,
>  				    strict_scanmask);
>  		kfree(compound_mask);
> -		if (scan_mask == NULL)
> +		if (!scan_mask)
>  			return -EINVAL;
>  	} else {
>  	    scan_mask = compound_mask;
> @@ -940,7 +940,7 @@ int iio_update_buffers(struct iio_dev *indio_dev,
>  		goto out_unlock;
>  	}
>  
> -	if (indio_dev->info == NULL) {
> +	if (!indio_dev->info) {
>  		ret = -ENODEV;
>  		goto out_unlock;
>  	}
> @@ -1130,11 +1130,11 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
>  				indio_dev->scan_index_timestamp =
>  					channels[i].scan_index;
>  		}
> -		if (indio_dev->masklength && buffer->scan_mask == NULL) {
> +		if (indio_dev->masklength && !buffer->scan_mask) {
>  			buffer->scan_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength),
>  						    sizeof(*buffer->scan_mask),
>  						    GFP_KERNEL);
> -			if (buffer->scan_mask == NULL) {
> +			if (!buffer->scan_mask) {
>  				ret = -ENOMEM;
>  				goto error_cleanup_dynamic;
>  			}
> @@ -1146,7 +1146,7 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
>  	buffer->scan_el_group.attrs = kcalloc(attrcount + 1,
>  					      sizeof(buffer->scan_el_group.attrs[0]),
>  					      GFP_KERNEL);
> -	if (buffer->scan_el_group.attrs == NULL) {
> +	if (!buffer->scan_el_group.attrs) {
>  		ret = -ENOMEM;
>  		goto error_free_scan_mask;
>  	}
> @@ -1291,7 +1291,7 @@ static int iio_buffer_add_demux(struct iio_buffer *buffer,
>  		(*p)->length += length;
>  	} else {
>  		*p = kmalloc(sizeof(**p), GFP_KERNEL);
> -		if (*p == NULL)
> +		if (!*p)
>  			return -ENOMEM;
>  		(*p)->from = in_loc;
>  		(*p)->to = out_loc;
> @@ -1356,7 +1356,7 @@ static int iio_buffer_update_demux(struct iio_dev *indio_dev,
>  		in_loc += length;
>  	}
>  	buffer->demux_bounce = kzalloc(out_loc, GFP_KERNEL);
> -	if (buffer->demux_bounce == NULL) {
> +	if (!buffer->demux_bounce) {
>  		ret = -ENOMEM;
>  		goto error_clear_mux_table;
>  	}
>