linux-kernel - Re: [BUG] checkpatch warning default switch case

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Message-ID: <CAGG-pUTh6stPf+DuEjEkMTQSMoOSZ1a02KbpFef8CFG5_5AHHQ@mail.gmail.com>
Date:	Fri, 11 Dec 2015 18:56:40 -0300
From:	"Geyslan G. Bem" <geyslan@...il.com>
To:	Joe Perches <joe@...ches.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andy Whitcroft <apw@...onical.com>,
	Peter Senna Tschudin <peter.senna@...il.com>
Subject: Re: [BUG] checkpatch warning default switch case

2015-12-11 17:21 GMT-03:00 Geyslan G. Bem <geyslan@...il.com>:
> 2015-12-11 17:08 GMT-03:00 Joe Perches <joe@...ches.com>:
>> On Fri, 2015-12-11 at 16:34 -0300, Geyslan G. Bem wrote:
>>> Hello,
>>>
>>> Running
>>> scripts/checkpatch.pl -f drivers/usb/host/ehci-sched.c
>>>
>>> I got this
>>> ...
>>> ERROR: spaces required around that ':' (ctx:VxE)
>>> #496: FILE: drivers/usb/host/ehci-sched.c:496:
>>> +                       default:
>>> ...
>>>
>>>
>>> 496:            default:
>>>                         ehci_dbg (ehci,
>>>                                 "periodic frame %d bogus type %d\n",
>>>                                 frame, type);
>>>                 }
>>>
>>> It seems a correct use of default switch case. Maybe the test concerns
>>> to ternary conditional.
>>>
>>> Let me know.
>>
>> Yes, it's a checkpatch defect.
>>
>> It's because a c99 style comment is immediately before this line.
>>
>>         switch (foo) {
>>         case 1:
>>                 break;
>>         // foo
>>         default:
>>                 break;
>>         }
>>
>> emits this ERROR
>>
>> I suggest you fix the comment and the message will go away.
> Ok, I'm fixing it.
>
> Tks.
>>
>> Andy?  Do you care to fix this defect?
>>
>

Another false positive:

WARNING: braces {} are not necessary for single statement blocks
#1570: FILE: drivers/usb/host/ehci-sched.c:1570:
+               else {
+                       start = (stream->ps.phase << 3) +
stream->ps.phase_uf;
+               }

The code:

        if (stream->ps.phase == NO_FRAME) {
            int        done = 0;
...
            reserve_release_iso_bandwidth(ehci, stream, 1);
        }

        /* New stream is already scheduled; use the upcoming slot */
        else {
            start = (stream->ps.phase << 3) + stream->ps.phase_uf;
        }

There's a C89 comment before the else branch and immediately before
that an empty line. They, I think, are confusing the parser.

>
>
> --
> Regards,
>
> Geyslan G. Bem
> hackingbits.com



-- 
Regards,

Geyslan G. Bem
hackingbits.com
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