linux-kernel - Re: [PATCH] staging: speakup: Comparison to NULL could be written

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Date:   Wed, 1 Mar 2017 11:52:47 -0800
From:   David Daney <ddaney.cavm@...il.com>
To:     Arushi Singhal <arushisinghal19971997@...il.com>,
        w.d.hubbs@...il.com
Cc:     Chris Brannon <chris@...-brannons.com>,
        Kirk Reiser <kirk@...sers.ca>,
        Samuel Thibault <samuel.thibault@...-lyon.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        speakup@...ux-speakup.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, outreachy-kernel@...glegroups.com
Subject: Re: [PATCH] staging: speakup: Comparison to NULL could be written

On 03/01/2017 11:21 AM, Arushi Singhal wrote:
> Fixed coding style for null comparisons in speakup driver to be more
> consistant with the rest of the kernel coding style.
>
> Signed-off-by: Arushi Singhal <arushisinghal19971997@...il.com>
> ---
>  drivers/staging/speakup/fakekey.c  |  2 +-
>  drivers/staging/speakup/kobjects.c |  2 +-
>  drivers/staging/speakup/main.c     | 38 +++++++++++++++++++-------------------
>  3 files changed, 21 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/staging/speakup/fakekey.c b/drivers/staging/speakup/fakekey.c
> index d76da0a1382c..294c74b47224 100644
> --- a/drivers/staging/speakup/fakekey.c
> +++ b/drivers/staging/speakup/fakekey.c
> @@ -56,7 +56,7 @@ int speakup_add_virtual_keyboard(void)
>
>  void speakup_remove_virtual_keyboard(void)
>  {
> -	if (virt_keyboard != NULL) {
> +	if (virt_keyboard) {
>  		input_unregister_device(virt_keyboard);
>  		virt_keyboard = NULL;
>  	}
> diff --git a/drivers/staging/speakup/kobjects.c b/drivers/staging/speakup/kobjects.c
> index 5d871ec3693c..fdd6e4b33951 100644
> --- a/drivers/staging/speakup/kobjects.c
> +++ b/drivers/staging/speakup/kobjects.c
> @@ -391,7 +391,7 @@ static ssize_t synth_store(struct kobject *kobj, struct kobj_attribute *attr,
>  		len--;
>  	new_synth_name[len] = '\0';
>  	spk_strlwr(new_synth_name);
> -	if ((synth != NULL) && (!strcmp(new_synth_name, synth->name))) {
> +	if ((synth) && (!strcmp(new_synth_name, synth->name))) {

With the change, the parenthesis are not needed.  In fact were then 
needed before?  There are two sets of unneeded parenthesis, get rid of 
them both.