linux-kernel - Re: [PATCH v3] Staging: iio: accel: Fixed NULL comparison style

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Date:	Sat, 19 Dec 2015 16:41:25 +0000
From:	Jonathan Cameron <jic23@...nel.org>
To:	Bhaktipriya Shridhar <bhaktipriya96@...il.com>, knaack.h@....de,
	lars@...afoo.de, pmeerw@...erw.net, gregkh@...uxfoundation.org,
	ciorneiioana@...il.com, cristina.moraru09@...il.com,
	dan.carpenter@...cle.com, josselin.costanzi@...ile-devices.fr
Cc:	linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] Staging: iio: accel: Fixed NULL comparison style

On 13/12/15 15:15, Bhaktipriya Shridhar wrote:
> The variable u8 **rx_p, is a pointer-to-pointer and hence the check
> should
> be "if (!*rx_p)" and not "if (!rx_p)".
> In the earlier version, checkpatch.pl gave the following check, which
> was incorrect:
> CHECK: Comparison to NULL could be written "!rx_p"
> +       if (*rx_p == NULL) {
> 
> Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@...il.com>
Applied to the togreg branch of iio.git with the addition of the driver name
in the patch title.

Thanks

Jonathan
> ---
>  Changes in v3:
>         - Replaced "if (!rx_p)" with "if (!*rx_p)"
> 	- Changes are made on the original code
> 
>  drivers/staging/iio/accel/sca3000_ring.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/iio/accel/sca3000_ring.c b/drivers/staging/iio/accel/sca3000_ring.c
> index 20b878d..1920dc60 100644
> --- a/drivers/staging/iio/accel/sca3000_ring.c
> +++ b/drivers/staging/iio/accel/sca3000_ring.c
> @@ -48,7 +48,7 @@ static int sca3000_read_data(struct sca3000_state *st,
>  		}
>  	};
>  	*rx_p = kmalloc(len, GFP_KERNEL);
> -	if (*rx_p == NULL) {
> +	if (!*rx_p) {
>  		ret = -ENOMEM;
>  		goto error_ret;
>  	}
> 

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