Re: [PATCH] staging: dgnc: replace DGNC_VERIFY_BOARD macro

[Fernando ApesteguÃa]

On Mon, Oct 17, 2016 at 10:29 AM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
> On Fri, Oct 14, 2016 at 07:22:57PM +0200, Fernando Apesteguia wrote:
>> The patch replaces the macro with a function (dgnc_get_board) and
>> substitutes the macro statement with a call to that function and a
>> comparison on the returned value.
>>
>> This removes a checkpatch warning.
>>
>> Signed-off-by: Fernando Apesteguia <fernando.apesteguia@xxxxxxxxx>
>> ---
>>  drivers/staging/dgnc/dgnc_sysfs.c | 74 +++++++++++++++++++++++++++------------
>>  1 file changed, 51 insertions(+), 23 deletions(-)
>>
>> diff --git a/drivers/staging/dgnc/dgnc_sysfs.c b/drivers/staging/dgnc/dgnc_sysfs.c
>> index 290bf6e..3ea23a9 100644
>> --- a/drivers/staging/dgnc/dgnc_sysfs.c
>> +++ b/drivers/staging/dgnc/dgnc_sysfs.c
>> @@ -90,17 +90,21 @@ void dgnc_remove_driver_sysfiles(struct pci_driver *dgnc_driver)
>>       driver_remove_file(driverfs, &driver_attr_pollrate);
>>  }
>>
>> -#define DGNC_VERIFY_BOARD(p, bd)                             \
>> -     do {                                                    \
>> -             if (!p)                                         \
>> -                     return 0;                               \
>> -                                                             \
>> -             bd = dev_get_drvdata(p);                        \
>> -             if (!bd || bd->magic != DGNC_BOARD_MAGIC)       \
>> -                     return 0;                               \
>> -             if (bd->state != BOARD_READY)                   \
>> -                     return 0;                               \
>> -     } while (0)
>> +static struct dgnc_board *dgnc_get_board(struct device *p)
>> +{
>> +     struct dgnc_board *bd;
>> +
>> +     if (!p)
>> +             return NULL;
>> +
>> +     bd = dev_get_drvdata(p);
>> +     if (!bd || bd->magic != DGNC_BOARD_MAGIC)
>> +             return NULL;
>> +     if (bd->state != BOARD_READY)
>> +             return NULL;
>> +
>> +     return bd;
>> +}
>
> No, this macro should be removed entirely as what it does is pointless
> in some parts, wrong in others, and not needed at all in the rest :(
>
> I've asked others to fix this up properly in the past, but it doesn't
> seem like anyone wants to do the work...
>

I tried to find the discussion the relevant mails in lkml.org but
couldn't find them. Could  you point me to them so I can have a look?

Thanks.

> I don't want to take this patch as it will hide the real issues here.
>
> thanks,
>
> greg k-h