netdev - Re: [PATCH 2/7] rtlwifi: rtl8192de: Fix smatch warnings in rtl8192de/hw.c

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Date:	Sat, 14 Sep 2013 15:30:13 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
CC:	linville@...driver.com, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 2/7] rtlwifi: rtl8192de: Fix smatch warnings in rtl8192de/hw.c

On 09/14/2013 02:59 PM, Sergei Shtylyov wrote:
> Hello.
>
> On 09/13/2013 09:44 PM, Larry Finger wrote:
>
>> Smatch lists the following:
>>    CHECK   drivers/net/wireless/rtlwifi/rtl8192de/hw.c
>> drivers/net/wireless/rtlwifi/rtl8192de/hw.c:1200 rtl92de_set_qos() info:
>> ignoring unreachable code.
>> drivers/net/wireless/rtlwifi/rtl8192de/hw.c:1200 rtl92de_set_qos() info:
>> ignoring unreachable code.
>
>> Dead code is removed.
>
>     It is instead commented out, including non-dead code it seems...
>
>> Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
>> ---
>>   drivers/net/wireless/rtlwifi/rtl8192de/hw.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/net/wireless/rtlwifi/rtl8192de/hw.c
>> b/drivers/net/wireless/rtlwifi/rtl8192de/hw.c
>> index 7dd8f6d..c9b0894 100644
>> --- a/drivers/net/wireless/rtlwifi/rtl8192de/hw.c
>> +++ b/drivers/net/wireless/rtlwifi/rtl8192de/hw.c
>> @@ -1194,6 +1194,7 @@ void rtl92d_linked_set_reg(struct ieee80211_hw *hw)
>>    * mac80211 will send pkt when scan */
>>   void rtl92de_set_qos(struct ieee80211_hw *hw, int aci)
>>   {
>> +/*
>>       struct rtl_priv *rtlpriv = rtl_priv(hw);
>>       rtl92d_dm_init_edca_turbo(hw);
>>       return;
>
>     Shouldn't the comment start here (and *return* removed)? It's also
> better to remove the dead code than just to comment it out.

That would leave some unused variables.

>> @@ -1213,6 +1214,7 @@ void rtl92de_set_qos(struct ieee80211_hw *hw, int aci)
>>           RT_ASSERT(false, "invalid aci: %d !\n", aci);
>>           break;
>>       }
>> + */
>>   }

I'm not sure what that unreachable code might do, thus I saved it as a comment 
for possible future use. I need to do further evaluation on this fragment, and 
probably consult with the Realtek engineers.

Larry


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