net: wireless: rtlwifi: rtl8723be: hw.c: Cleaning up if statement that always evaluates to false

I find a logical error in an if statement '(X & 0xfc) == 0x3' is always false

After pointing this out, Larry Finger informed what would be the correct one.
'(X & 0x3) == 0x3'

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
---
 drivers/net/wireless/rtlwifi/rtl8723be/hw.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

On Sun, 8 Jun 2014, Rickard Strandqvist wrote:

> I find a logical error in an if statement '(X & 0xfc) == 0x3' is always false
> 

Where is the 0xfc that your converting?

> After pointing this out, Larry Finger informed what would be the correct one.
> '(X & 0x3) == 0x3'
> 

This is already what it is, just say that you're replacing it with the 
constant.

> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
> ---
>  drivers/net/wireless/rtlwifi/rtl8723be/hw.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/rtlwifi/rtl8723be/hw.c b/drivers/net/wireless/rtlwifi/rtl8723be/hw.c
> index 0fdf090..b61044f 100644
> --- a/drivers/net/wireless/rtlwifi/rtl8723be/hw.c
> +++ b/drivers/net/wireless/rtlwifi/rtl8723be/hw.c
> @@ -1197,7 +1197,7 @@ static int _rtl8723be_set_media_status(struct ieee80211_hw *hw,
>  	}
>  	rtl_write_byte(rtlpriv, (MSR), bt_msr);
>  	rtlpriv->cfg->ops->led_control(hw, ledaction);
> -	if ((bt_msr & 0x03) == MSR_AP)
> +	if ((bt_msr & MSR_AP) == MSR_AP)
>  		rtl_write_byte(rtlpriv, REG_BCNTCFG + 1, 0x00);
>  	else
>  		rtl_write_byte(rtlpriv, REG_BCNTCFG + 1, 0x66);
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Hi

Quite right!
I found this error in some of the files. And after discussion with
Larry Finger and Peter Wu, it was decided that all files with this if
statement should change.

But of course I should update the comment to something more suitable.


Kind regards
Rickard Strandqvist


2014-06-08 22:35 GMT+02:00 David Rientjes <rientjes@google.com>:
> On Sun, 8 Jun 2014, Rickard Strandqvist wrote:
>
>> I find a logical error in an if statement '(X & 0xfc) == 0x3' is always false
>>
>
> Where is the 0xfc that your converting?
>
>> After pointing this out, Larry Finger informed what would be the correct one.
>> '(X & 0x3) == 0x3'
>>
>
> This is already what it is, just say that you're replacing it with the
> constant.
>
>> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
>> ---
>>  drivers/net/wireless/rtlwifi/rtl8723be/hw.c |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/wireless/rtlwifi/rtl8723be/hw.c b/drivers/net/wireless/rtlwifi/rtl8723be/hw.c
>> index 0fdf090..b61044f 100644
>> --- a/drivers/net/wireless/rtlwifi/rtl8723be/hw.c
>> +++ b/drivers/net/wireless/rtlwifi/rtl8723be/hw.c
>> @@ -1197,7 +1197,7 @@ static int _rtl8723be_set_media_status(struct ieee80211_hw *hw,
>>       }
>>       rtl_write_byte(rtlpriv, (MSR), bt_msr);
>>       rtlpriv->cfg->ops->led_control(hw, ledaction);
>> -     if ((bt_msr & 0x03) == MSR_AP)
>> +     if ((bt_msr & MSR_AP) == MSR_AP)
>>               rtl_write_byte(rtlpriv, REG_BCNTCFG + 1, 0x00);
>>       else
>>               rtl_write_byte(rtlpriv, REG_BCNTCFG + 1, 0x66);
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(Please do not top-post.)

On Sunday 08 June 2014 22:47:31 Rickard Strandqvist wrote:
> I found this error in some of the files. And after discussion with
> Larry Finger and Peter Wu, it was decided that all files with this if
> statement should change.
> 
> But of course I should update the comment to something more suitable.

Right, do not forget to use [PATCH v2] as prefix and adjust the subject
too as this is no longer just "cleaning up a statement that always
evaluates to false", but rather "fix [insert stuff here] mask" (for
the 0xfc cases). The commit message must describe why the change is
beneficial, see other commit messages for examples.

Kind regards,
Peter

> 2014-06-08 22:35 GMT+02:00 David Rientjes <rientjes@google.com>:
> > On Sun, 8 Jun 2014, Rickard Strandqvist wrote:
> >
> >> I find a logical error in an if statement '(X & 0xfc) == 0x3' is always false
> >>
> >
> > Where is the 0xfc that your converting?
> >
> >> After pointing this out, Larry Finger informed what would be the correct one.
> >> '(X & 0x3) == 0x3'
> >>
> >
> > This is already what it is, just say that you're replacing it with the
> > constant.
> >
> >> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
> >> ---
> >>  drivers/net/wireless/rtlwifi/rtl8723be/hw.c |    2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/net/wireless/rtlwifi/rtl8723be/hw.c b/drivers/net/wireless/rtlwifi/rtl8723be/hw.c
> >> index 0fdf090..b61044f 100644
> >> --- a/drivers/net/wireless/rtlwifi/rtl8723be/hw.c
> >> +++ b/drivers/net/wireless/rtlwifi/rtl8723be/hw.c
> >> @@ -1197,7 +1197,7 @@ static int _rtl8723be_set_media_status(struct ieee80211_hw *hw,
> >>       }
> >>       rtl_write_byte(rtlpriv, (MSR), bt_msr);
> >>       rtlpriv->cfg->ops->led_control(hw, ledaction);
> >> -     if ((bt_msr & 0x03) == MSR_AP)
> >> +     if ((bt_msr & MSR_AP) == MSR_AP)
> >>               rtl_write_byte(rtlpriv, REG_BCNTCFG + 1, 0x00);
> >>       else
> >>               rtl_write_byte(rtlpriv, REG_BCNTCFG + 1, 0x66);

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