linux-kernel - Re: [PATCH 2/3] staging: rtl8188eu: bugfix: correct channels range is set in Hal

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Date:	Tue, 13 Oct 2015 22:32:45 +0700
From:	Ivan Safonov <insafonov@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Subject: Re: [PATCH 2/3] staging: rtl8188eu: bugfix: correct channels range is
 set in Hal_ReadTxPowerInfo88E

On 10/13/2015 10:47 AM, Greg Kroah-Hartman wrote:
> On Sat, Oct 10, 2015 at 01:27:00PM +0700, Ivan Safonov wrote:
>> Correct channels range is 1..14 (numbering from 1) but not 0..13.

> Have you tested this?

I have not tested it.

> Why?

>From condition

if (chnl <= 14) {
         bIn24G = true;

it shows that the highest number of channels at a frequency of 2.4 GHz 
is 14.
And first comment tells us that only 2 channels has the numbers <3, 
which means that the numbering starts from 1:

static u8 Hal_GetChnlGroup88E(u8 chnl, u8 *pGroup)
{
     u8 bIn24G = true;

     if (chnl <= 14) {
         bIn24G = true;

         if (chnl < 3)            /*  Channel 1-2 */
             *pGroup = 0;
         else if (chnl < 6)        /*  Channel 3-5 */
             *pGroup = 1;
         else     if (chnl < 9)        /*  Channel 6-8 */
             *pGroup = 2;
         else if (chnl < 12)        /*  Channel 9-11 */
             *pGroup = 3;
         else if (chnl < 14)        /*  Channel 12-13 */
             *pGroup = 4;
         else if (chnl == 14)        /*  Channel 14 */
             *pGroup = 5;
     } else {
   ... // 5 GHz groups


Hal_ReadTxPowerInfo88E function raises questions in this location(->):

if (bIn24G) {
pHalData->Index24G_CCK_Base[rfPath][ch] = 
pwrInfo24G.IndexCCK_Base[rfPath][group];
->              if (ch == 14)
-> pHalData->Index24G_BW40_Base[rfPath][ch] = 
pwrInfo24G.IndexBW40_Base[rfPath][4];
->             else
-> pHalData->Index24G_BW40_Base[rfPath][ch] = 
pwrInfo24G.IndexBW40_Base[rfPath][group];
             }


If channel range is 0..(CHANNEL_MAX_NUMBER - 1) code is dead 
(CHANNEL_MAX_NUMBER = 14):

But if channel range is 1..14 will the right to remove branching if (ch 
== 14) in Hal_ReadTxPowerInfo88E, changing Hal_GetChnlGroup88E so that 
when chnl == 14 itreturned 4?
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