linux-kernel - Re: [greybus-dev] [PATCH] Staging:greybus Fix comparison to NULL

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Date:   Tue, 5 Jun 2018 12:00:51 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Janani Sankara Babu <jananis37@...il.com>,
        devel@...verdev.osuosl.org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, greybus-dev@...ts.linaro.org
Subject: Re: [greybus-dev] [PATCH] Staging:greybus Fix comparison to NULL

On Tue, Jun 05, 2018 at 11:02:36AM +0530, Viresh Kumar wrote:
> On 03-06-18, 08:52, Janani Sankara Babu wrote:
> > This patch replaces comparison of var to NULL with !var
> > 
> > Signed-off-by: Janani Sankara Babu <jananis37@...il.com>
> > ---
> >  drivers/staging/greybus/core.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/staging/greybus/core.c b/drivers/staging/greybus/core.c
> > index dafa430..5d14a4e 100644
> > --- a/drivers/staging/greybus/core.c
> > +++ b/drivers/staging/greybus/core.c
> > @@ -48,7 +48,7 @@ static bool greybus_match_one_id(struct gb_bundle *bundle,
> >  static const struct greybus_bundle_id *
> >  greybus_match_id(struct gb_bundle *bundle, const struct greybus_bundle_id *id)
> >  {
> > -	if (id == NULL)
> > +	if (!id)
> 
> It is pretty much personal preference and there is no good reason to accept this
> patch really.

Checkpatch complains, so it's Official Kernel Style now.

The != NULL comparison is a double negative which makes it not less
annoying than official kernel style.

regards,
dan carpenter