[PATCH] Staging:greybus Fix comparison to NULL

[PATCH] Staging:greybus Fix comparison to NULL

[Janani Sankara Babu]

This patch replaces comparison of var to NULL with !var

Signed-off-by: Janani Sankara Babu <jananis37@gmail.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)
 		return NULL;

 	for (; id->vendor || id->product || id->class || id->driver_info;
--
1.9.1

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

[Viresh Kumar]

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@gmail.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.

-- 
viresh

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

[Johan Hovold]

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@gmail.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.

I agree with you, Viresh, but greybus is still living in staging which
makes checkpatch enable the --strict option, thereby forcing its authors
preferences onto the rest of us.

I also do understand Greg's point that while --strict is enabled,
rejecting such patches will probably cause some new submitters to do
work for nothing, which is not good.

On the other hand, I at least think we should enforce having a patch
description that clearly indicates that this is just something to make
checkpatch happy (reserving the term "fix" for proper fixes, at least if
not used in conjunction with "checkpatch warning").

So Janani, would you mind resubmitting this patch with a slightly
modified commit message, such as:

	staging: greybus: clean up NULL comparisons

	Replace comparison of var to NULL with !var in order to address
	a checkpatch (strict) warning.

You could also change the sole remaining comparison to NULL in bundle.c
in the same patch.

Thanks,
Johan

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

[Dan Carpenter]

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@gmail.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

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

[Alex Elder]

On 06/05/2018 04:00 AM, Dan Carpenter wrote:
> 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@gmail.com>

Wow, such deep discussion for such a trivial patch!

I say we take it, mostly because I personally prefer being
permissive if there's nothing technically wrong with a patch,
but also because I'm swayed by the other comments.

That being said, I agree with Johan--the patch would be
improved with a little better comment about what motivated
the submission.  So I'll wait for v2.

					-Alex

>>> ---
>>>  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
> 
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