linux-kernel - Re: [PATCH] mmc: usdhi6rol0: mark expected switch fall-throughs

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Message-ID: <a69a2138-0515-82f7-ab32-21d62c248829@embeddedor.com>
Date:   Thu, 21 Mar 2019 12:14:18 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] mmc: usdhi6rol0: mark expected switch fall-throughs



On 3/21/19 5:46 AM, Ulf Hansson wrote:
> On Wed, 20 Mar 2019 at 21:02, Gustavo A. R. Silva
> <gustavo@...eddedor.com> wrote:
>>
>> In preparation to enabling -Wimplicit-fallthrough, mark switch
>> cases where we are expecting to fall through.
>>
>> This patch fixes the following warnings:
>>
>> In file included from drivers/mmc/host/usdhi6rol0.c:9:
>> drivers/mmc/host/usdhi6rol0.c: In function ‘usdhi6_timeout_work’:
>> ./include/linux/device.h:1483:2: warning: this statement may fall through [-Wimplicit-fallthrough=]
>>   _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__)
>>   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/mmc/host/usdhi6rol0.c:1689:3: note: in expansion of macro ‘dev_err’
>>    dev_err(mmc_dev(host->mmc), "Invalid state %u\n", host->wait);
>>    ^~~~~~~
>> drivers/mmc/host/usdhi6rol0.c:1691:2: note: here
>>   case USDHI6_WAIT_FOR_CMD:
>>   ^~~~
>> drivers/mmc/host/usdhi6rol0.c:1711:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
>>    usdhi6_sg_unmap(host, true);
>>    ^~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/mmc/host/usdhi6rol0.c:1716:2: note: here
>>   case USDHI6_WAIT_FOR_DATA_END:
>>   ^~~~
>> drivers/mmc/host/usdhi6rol0.c: In function ‘usdhi6_stop_cmd’:
>> drivers/mmc/host/usdhi6rol0.c:1338:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
>>    if (mrq->stop->opcode == MMC_STOP_TRANSMISSION) {
>>       ^
>> drivers/mmc/host/usdhi6rol0.c:1343:2: note: here
>>   default:
>>   ^~~~~~~
>>
>> Warning level 3 was used: -Wimplicit-fallthrough=3
>>
>> This patch is part of the ongoing efforts to enable
>> -Wimplicit-fallthrough.
>>
>> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
>> ---
>>  drivers/mmc/host/usdhi6rol0.c | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/mmc/host/usdhi6rol0.c b/drivers/mmc/host/usdhi6rol0.c
>> index cd8b1b9d4d8a..b9712ac96be5 100644
>> --- a/drivers/mmc/host/usdhi6rol0.c
>> +++ b/drivers/mmc/host/usdhi6rol0.c
>> @@ -1339,7 +1339,7 @@ static int usdhi6_stop_cmd(struct usdhi6_host *host)
>>                         host->wait = USDHI6_WAIT_FOR_STOP;
>>                         return 0;
>>                 }
>> -               /* Unsupported STOP command */
>> +               /* fall through - Unsupported STOP command */
>>         default:
>>                 dev_err(mmc_dev(host->mmc),
>>                         "unsupported stop CMD%d for CMD%d\n",
>> @@ -1688,6 +1688,7 @@ static void usdhi6_timeout_work(struct work_struct *work)
>>         default:
>>                 dev_err(mmc_dev(host->mmc), "Invalid state %u\n", host->wait);
>>                 /* mrq can be NULL in this actually impossible case */
>> +               /* fall through */
> 
> Please make this one comment.
> 
>>         case USDHI6_WAIT_FOR_CMD:
>>                 usdhi6_error_code(host);
>>                 if (mrq)
>> @@ -1713,6 +1714,7 @@ static void usdhi6_timeout_work(struct work_struct *work)
>>                  * If USDHI6_WAIT_FOR_DATA_END times out, we have already unmapped
>>                  * the page
>>                  */
>> +               /* fall through */
> 
> Ditto.
> 

OK.  The reason why I didn't do that is because the line would exceed the 80 characters
in both cases. But I'll respin if you are OK with that.

Thanks
--
Gustavo

>>         case USDHI6_WAIT_FOR_DATA_END:
>>                 usdhi6_error_code(host);
>>                 data->error = -ETIMEDOUT;
>> --
>> 2.21.0
>>
> 
> Kind regards
> Uffe
>