netdev - Re: [PATCH] carl9170: Fix error return -EAGAIN if not started

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Date:   Fri, 8 Oct 2021 17:15:35 +0200
From:   Christian Lamparter <chunkeey@...il.com>
To:     Colin Ian King <colin.king@...onical.com>,
        Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Christian Lamparter <chunkeey@...glemail.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "John W . Linville" <linville@...driver.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] carl9170: Fix error return -EAGAIN if not started

Hello,

On 08/10/2021 09:31, Colin Ian King wrote:
> On 08/10/2021 06:58, Dan Carpenter wrote:
>> On Fri, Oct 08, 2021 at 01:15:58AM +0100, Colin King wrote:
>>> From: Colin Ian King <colin.king@...onical.com>
>>>
>>> There is an error return path where the error return is being
>>> assigned to err rather than count and the error exit path does
>>> not return -EAGAIN as expected. Fix this by setting the error
>>> return to variable count as this is the value that is returned
>>> at the end of the function.
>>>
>>> Addresses-Coverity: ("Unused value")
>>> Fixes: 00c4da27a421 ("carl9170: firmware parser and debugfs code")
>>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>>> ---
>>>   drivers/net/wireless/ath/carl9170/debug.c | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/net/wireless/ath/carl9170/debug.c b/drivers/net/wireless/ath/carl9170/debug.c
>>> index bb40889d7c72..f163c6bdac8f 100644
>>> --- a/drivers/net/wireless/ath/carl9170/debug.c
>>> +++ b/drivers/net/wireless/ath/carl9170/debug.c
>>> @@ -628,7 +628,7 @@ static ssize_t carl9170_debugfs_bug_write(struct ar9170 *ar, const char *buf,
>>>       case 'R':
>>>           if (!IS_STARTED(ar)) {
>>> -            err = -EAGAIN;
>>> +            count = -EAGAIN;
>>>               goto out;
>>
>> This is ugly.  The bug wouldn't have happened with a direct return, it's
>> only the goto out which causes it.  Better to replace all the error
>> paths with direct returns.  There are two other direct returns so it's
>> not like a new thing...
> 
> Yep, I agree it was ugly, I was trying to keep to the coding style and reduce the patch delta size. I can do a V2 if the maintainers deem it's a cleaner solution.

Hm? I don't think there's any need to stick to a particular
coding style. This file hasn't been touched a lot since 2010.
Things moved on and replacing the gotos with straight return
is totally fine.

(It has to pass the build checkers of course. However I don't
think this will be a problem here...)

Cheers,
Christian