Re: [Outreachy kernel] [PATCH 3/5] staging: rtl8712: Remove unnecessary else after return

[SIMRAN SINGHAL]

On Tue, Feb 28, 2017 at 2:49 AM, Julia Lawall <julia.lawall@xxxxxxx> wrote:
>
>
> On Mon, 27 Feb 2017, simran singhal wrote:
>
>> This patch fixes the checkpatch warning that else is not generally
>> useful after a break or return.
>>
>> This was done using Coccinelle:
>> @@
>> expression e2;
>> statement s1;
>> @@
>> if(e2) { ... return ...; }
>> -else
>>          s1
>
> One might be surprised that the following code was detected using the
> above semantic patch, because in the code below there is no return in the
> if branches.  Actually, as a special feature, when one has an if branch
> that ends in return, Coccinelle will skip through any gotos and see if the
> return is matched afterward.  Indeed it is a common pattern to have
>
> if (...) {
>    foo(x);
>    bar(y);
>    return -ENOMEM;
> }
>
> But the code can also be cut up as eg
>
> if (...) {
>    ret = -ENOMEM;
>    goto out;
> }
> ...
> out:
>    foo(x);
>    bar(y);
>    return ret;
>
> To avoid having to write multiple patterns for these cases, Coccinelle
> will just jump through the return in the second case, allowing the same
> pattern to match both of them.
>
Julia, Thanks for explaination. Its really helpful.

But I think there is no problem in removing else.
Because it will execute this

 padapter->dvobjpriv.inirp_init(padapter);

when if condition will not satisfy.

> julia
>
>>
>> Signed-off-by: simran singhal <singhalsimran0@xxxxxxxxx>
>> ---
>>  drivers/staging/rtl8712/os_intfs.c | 3 +--
>>  1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/drivers/staging/rtl8712/os_intfs.c b/drivers/staging/rtl8712/os_intfs.c
>> index 8836b31..3062167 100644
>> --- a/drivers/staging/rtl8712/os_intfs.c
>> +++ b/drivers/staging/rtl8712/os_intfs.c
>> @@ -411,8 +411,7 @@ static int netdev_open(struct net_device *pnetdev)
>>                       goto netdev_open_error;
>>               if (!padapter->dvobjpriv.inirp_init)
>>                       goto netdev_open_error;
>> -             else
>> -                     padapter->dvobjpriv.inirp_init(padapter);
>> +             padapter->dvobjpriv.inirp_init(padapter);
>>               r8712_set_ps_mode(padapter, padapter->registrypriv.power_mgnt,
>>                                 padapter->registrypriv.smart_ps);
>>       }
>> --
>> 2.7.4
>>
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